Power System Studies

07/06/2022 JO 6950.27B Chapter 1. General Information 1. Purpose of This Order . This order establishes the policy, procedures, and guidance to conduct the power system studies required to ensure adequacy and resiliency of the power distribution system infrastructure supporting National Airspace System (NAS) facilities. Federal Aviation Administration (FAA) Power Distribution Systems will provide (1) continuity of service; (2) protection of people and equipment, and; (3) selective fault isolation where needed in the electrical distribution system.

2. Audience . The audience for this order will typically consist of engineers, designers, technicians, and managers directly involved with a power system’s design, construction, renovation, installation, maintenance, and operation at FAA facilities. The audience may be FAA employees, or they may be employees of a firm working under a contract with the Government.

The reader is encouraged to review Order JO 3900.64 Air Traffic Organization Electrical Safety Program for additional information related to electrical hazards.

3. Where Can I Find This Order . You can find an electronic copy of this order on the Directives Management System (DMS) website at https://employees.faa.gov/tools_resources/orders_notices/. Or go to the MyFAA employee website, select “Tools & Resources” and then select “Orders and Notices”. This order is also available on the Power Services Group’s, Orders, Standards, and Specifications website: https:// my.faa.gov/org/linebusiness/ato/operations/facilities_engineering/power_services/ sys_eng_team/stand_specs.html .

4. Cancellation . This order cancels FAA Order 6950.27A, Power System Analyses: Load Flow Calculations, Short Circuit Analysis, Protective Device Coordination Studies, and Arc Flash Risk Assessment, dated April 13, 2016.

5. Explanation of Policy Changes . This revision extensively updates JO 6950.27A by enhancing requirements related to the design and engineering analysis associated with power system studies. The revisions incorporate informative guidance for how to conduct and prepare power system studies to ensure compliance with the order. Major and minor changes include the following: a. Renaming the order from “Power System Analyses: Load Flow Calculations, Short Circuit Analysis, Protective Device Coordination Studies, and Arc Flash Risk Assessment” to “Power System Studies.” b. A documented effort must be made to reduce the arc flash incident energy to the lowest level possible. The study report should include commentary for every location with calculated incident energy above 4 cal/cm for purpose of documenting the effort, such as reviewing the overcurrent protective device selection and settings, to achieve objective of reducing arc flash incident energy to the lowest possible levels with selected devices.

c. Adding informative material to standardize the implementation, submission, and approval process for power studies.

d. Making editorial revisions and updating referencing for codes and industry standards.

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07/06/2022 JO 6950.27B Chapter 2. Power Study: General Requirements 1. Overview . FAA projects, including the initial design and sustainment of equipment or infrastructure, typically involve some level of electrical power design. This chapter provides criteria for determining when and to what extent a power study is needed and the roles and responsibilities of those undertaking it.

a. Power studies include analysis covering the following areas: (1) Power load-flow analysis (PLFA) (2) Short-circuit analysis (SCA) (3) Protective device coordination analysis (PDCA) (4) Arc-flash risk assessment (AFRA) (5) Harmonic analysis.

Note: Harmonic analysis is not required in every power study/project. When a contract document specifically calls for a harmonic study to be conducted, it shall follow the procedure described in this order.

b. Power systems analyses of alternating-current (ac) and direct-current (dc) facility power distribution systems shall be accomplished in accordance with the following: (1) National Electric Code (NEC) (2) FAA-STD-032, Design Standards for National Airspace System Physical Facilities (3) Institute of Electrical and Electronic Engineers (IEEE) Standard 399, IEEE Recommended Practice for Industrial and Commercial Power Systems Analysis.

c. These analyses shall be accomplished as part of the project design submission and deliverable process.

2. Roles and Responsibilities .

a. The FAA organization providing engineering leadership for the project (program office or project level organization responsible for the system design) shall be responsible for ensuring the power system calculations described in this order are properly performed. The analyses shall show that values in the study meet or exceed and do not compromise the FAA's performance objectives for the electrical systems. The distribution system design must provide efficient, convenient, and adequate power service, and incorporate future expansion provision (where required).

b. The FAA program office requesting the power system project (for example, AJW-221) and the lead project engineer responsible for the installation or modification will share the responsibility for performing PLFA, SCA, PDCA, AFRA studies. The FAA program office will be responsible for (1) performing electrical power analyses in accordance with this order and based upon type of project being implemented; (2) reviewing calculation submittals performed by design firms, and; (3) archiving project calculation submittals in the power calculations 2-1 07/06/2022 JO 6950.27B module of the Facility Power Panel Schedule database according to Order JO 6080.1, Facility Power Panel Schedule (FPPS).

c. The Environmental and Occupational Safety and Health (EOSH) program office, AJW- 23, will provide technical guidance on implementing the electrical safety requirements and oversight responsibilities for compliance with the National Electrical Safety Program.

d. Qualified engineers shall prepare the power studies required by this order. Qualified engineers are registered or certified professional electrical engineers or FAA electrical engineers.

The qualified engineer shall have at least 5 years of experience independently conducting and interpreting the power system analyses covered in this order.

e. The power systems analyses, and studies shall be used as the basis for specifying the rating and selecting the type of protective devices. To ensure that this requirement is met, Statements of Work (SOW) shall include requirements for power system analyses as described in this order, IEEE Std 399, IEEE Recommended Practice for Industrial and Commercial Power Systems Analysis, and other IEEE color book series.

f. The appropriate NAS equipment program office in coordination with the power distribution system Resident Engineer will coordinate NAS electronic systems and equipment.

This order addresses protection and overcurrent protective device (OCPD) coordination requirements for the power distribution system from power source to the end-of-line branch circuit panelboard circuit breaker devices that supply power to the electronic equipment. FAA- G-2100 addresses the OCPD requirements within the electronic equipment and subsystems. This order intends for the equipment interface connection point at facility branch panelboard OCPD to be coordinated.

3. Analysis Decision Process .

a. The FAA organization providing electrical engineering leadership for the project, in consultation with Engineering Services, the District/System Support Center (SSC) manager, EOSH, and other Program managers as appropriate, will determine whether there is a need to conduct a full analysis and calculations. The assessment process can take place in the planning or in design phase and shall be determined as follows: b. In general, modifications such as changes to short-circuit current, protective device ratings or adjustment settings, or calculated incident energy levels, or any equipment modification that invalidates existing AFRA warning labels, requires a power study.

c. If the site, district, service area, or program office cannot agree upon the level of study required, the issue will be elevated to the Power Services Group, AJW-22, for resolution.

4. Engineering Assessment Guidelines . The engineer shall assess the project and consider factors that will influence parameters associated with power load-flow and short-circuit calculations, protective device coordination analysis, and arc-flash hazard analysis. Refer to the following: a. Table 2-1 for project type related to the assessment and decision process for determining when to conduct a study.

2-2 07/06/2022 JO 6950.27B b. Figure 2-1, Process Sequence of Steps for Implementation of JO 6950.27, for a description of end-state deliverable framework.

c. Figure 8-1, Delivery Process Flow Chart, for guidance related to typical compliance paths based on the project type and assessment determination criteria.

Table 2-1: Determining the Need for a Study and Extent of Analyses per Project Type Load Project Category Analysis PLFA SCA PDCA AFRA Remarks New building design and 1 1 1 1 1 — construction Building renovation of 2 1 1 1 1 3 power distribution system Equipment modification 8 4 4 4 4 — Equipment replacement 8 4 4 4 4 — Equipment form/fit/function 8 5 5 5 5 6 replacement Addition of alternative 2 7 7 7 7 — energy power sources Facility 5-year assessment 8 7 7 7 7 — update Existing facility power study documentation 8 7 7 7 7 — unavailable Notes: 1. Provide complete power study submission in accordance with the project design deliverable process.

2. Develop Load Analysis summary table during initial design submission in accordance with the project or program planning requirements document.

3. Existing Facility Power Panel Schedule (FPPS) data may be used to establish the Load Analysis information.

4. Refer to Appendix D for assessment conditions. Update analysis as applicable.

5. Refer to Appendix D for form/fit/function assessment conditions. Update analysis as applicable.

6. Analysis is not required for equipment replacement of same type, model, and specification.

7. Update FPPS data and power study documentation per JO 6950.27B.

8. Analysis is not required.

2-3 07/06/2022 JO 6950.27B Figure 2-1. Process Sequence of Steps for Implementation of JO 6950.27 2-4 07/06/2022 JO 6950.27B 5. Deliverables . The power studies shall be incorporated into the project design data handbook in accordance with FAA-STD-032 deliverable requirements. A copy of the power studies should be provided to the installation contractor. The installation contractor shall be responsible to maintain the power study documentation through the project commissioning process. If changes or deviations from the approved design study are made, the installation contractor shall revise affected portions of the studies to reflect those changes or deviations. The installation contractor's scope of work specifications shall require the contractor to prepare and submit those revised portions of the studies as part of final system acceptance and record documentation submissions. Additionally, the contract specifications shall require the contractor to submit, as a minimum, one hard copy and one computer-readable media copy (soft copy) of each study. The study documentation and submission process shall include the following information: a. Provide a report prepared in accordance with each chapter’s submission requirements.

The report shall provide the calculation performed for the analyses, including computer analysis programs utilized. The name of the software package, developer, and version number shall be provided.

b. Computer Software Program: Prepare study using the latest revision of the SKM Systems Analysis Power*Tools for Windows (PTW) software program.

c. Provide copies of the report and results in electronic format, referenced to the power one- line diagram and calculation model input parameters.

d. Provide the software program's native calculation model, program data files, and data collection information used in the study. The calculation model and data files shall be in a format for use by the site to perform analysis or recreate the calculations.

e. The coordination study shall be completed and submitted to FAA within a mutually agreed time prior to completion of the approved design. The results of the study shall be incorporated into the design as applicable. A copy of the approved report shall be included as part of the Design Data Handbook in accordance with FAA-STD-032. The study shall be conducted as early as practically possible in the design phase and shall be updated with every following submission.

f. The settings of the overcurrent and ground-fault protective devices shall be verified during commissioning and modified if needed.

g. Copies of the native software program files, library files, calculations, analyses, and studies submitted and accepted final documentation shall be deposited in the FPPS database system in accordance with documentation archive process by the office responsible for the project. The native program files shall be provided to the FAA, upon request, during submission deliverable and approval process to validate and review accuracy of the model and report.

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07/06/2022 JO 6950.27B Chapter 3. Power Load-Flow Analysis (PFLA) 2. Overview . A PLFA includes the following parts: a. Load analysis b. Power load-flow calculations.

3. Objectives . Determination of following parameters: a. Determination of system(es) power load requirement, (Load analysis) b. Determination of power operating loading conditions, (PLFA) c. Determination of power system voltage conditions, (PLFA).

4. Load Analysis . Provide a summary tabulation estimate for the power distribution system demand load requirement.

a. The load analysis is the starting point for project planning and initial design approval process.

(1) Purpose. The load analysis provides the basis for power system calculations and distribution equipment selections. The project planning and initial design requires careful collection of data, verification, and documentation of the basis of design (BOD).

(2) Load Analysis Report Submission.

(a) Provide an itemized summary of the power distribution system demand load requirement.

(b) Designer should use power system demand loading information based on metered data whenever possible, for determination of distribution equipment sizing and selection requirements. When metered data is not available, use demand and system diversity factors or established loading data from similar FAA facilities.

(c) Equipment nameplate data may be used to determine the branch distribution connected power loads.

(d) Consideration for future growth and spare device/space requirements should be addressed during the scoping of the project. The assessment for spare capacity should include input from facility/regional office leadership.

Note: Design main service equipment to provide approximately 15% combination of spare devices/space to accommodate future work. Include this 15% spare capacity in the demand load calculations for future or anticipated load growth.

5. PLFA Calculations . Determine active and reactive power, voltage, current, and power factor throughout the electrical system. The analysis shall include possible system power-flow operating scenarios.

a. PLFA results provides the basis for validation of the distribution system architecture.

3-1 07/06/2022 JO 6950.27B b. The PLFA calculation model is the starting point for short-circuit and protective device coordination analyses.

(1 ) P ur pos e . T he pow e r l oa d - f l ow a na l y s i s pr ovi de s t he ba s i s f or de t e r m i ne t h e nor m a l o p er at i n g p ar am et er s o f t he pow e r di s t r i but i on s y s t e m . T he r e s ul t s of t he P L F A c a l c ul a t i ons s ha l l d e te r min e th e f o llo w in g p a r a me te r s : ( a) C o mme r c ia l u tilit y s e r v ic e e n tr a n c e e q u ip me nt p e a k de m a nd l oa d r e qui r e m e nt (b) Alternate power source equipment sizing requirements (c) Power feeder conductor and conduit sizing requirements (d) Power feeder voltage-drop calculations.

(2) PLFA Report Submission. Provide a power load-flow report containing the following items: (a) Basis, description, purpose, and scope of the study (b) Tabulations of the data used to model the system components and a corresponding power one-line diagram (c) Description of power flow operating scenarios (d) Power load-flow scenarios and voltage-drop calculation results annotated on the calculation model one-line diagram (e) Tabulation of results consolidated into a summary report.

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07/06/2022 JO 6950.27B Chapter 4. Short-Circuit Analysis (SCA) 1. Overview . Short-circuit calculation is a fundamental part of power engineering. Perform an SCA before finalizing the distribution system layout, system voltage levels, and sizing of feeder conductors and transformers. For existing systems, fault-current analysis is necessary in cases where changes are made to power source equipment short-circuit contribution, motor loads are added, feeder system layout is modified, protection equipment is rearranged, or when conducting analyses involving determination of existing OCPDs adequacy.

2. Objectives . Determine the magnitude of short-circuit current flow throughout the distribution system at various time intervals after a fault occurs. Provide analyses of salient power-flow operating scenarios such as commercial utility, generator, and maintenance tie circuit connection power operating modes. Calculate the following fault-current conditions: a. Three-phase bolted-fault b. Single line-to-ground faults c. Double-line-to-ground faults d. Line-to-line faults.

Calculate short-circuit currents for following time frames: a. Momentary, 1/2 cycle currents b. Interrupting, 3 and 5 cycle currents c. Time delayed, 30 cycle currents.

3. Purpose . The short-circuit analysis shall calculate ac and dc short-circuit currents in accordance with American National Standards Institute (ANSI)-approved standards. The results of the SCA calculations are to be used to validate the application of short-circuit momentary and interrupting duties for equipment used in the power distribution system. Application considerations shall compare SCA results against the power distribution equipment ratings. The SCA results shall include the following parts: a. Calculate short-circuit momentary and interrupting duties for a three-phase bolted fault throughout the distribution system.

b. For grounded systems, provide a bolted line-to-ground fault-current study for areas as defined for the three-phase bolted fault short-circuit study.

c. Protective device evaluation: (1) Evaluate equipment and protective devices and compare to short-circuit ratings (2) Evaluate adequacy of the distribution system equipment ratings to withstand short- circuit stresses 4-1 07/06/2022 JO 6950.27B (3) Identify areas where circuit protective devices are improperly rated for the calculated available fault-current.

4. Procedure . The short-circuit study shall be performed in accordance with the recommended practices and procedures set forth in ANSI/IEEE Std-399, and the step-by-step procedures outlined in the short-circuit calculation chapters of IEEE Std-141, IEEE Std-551.

a. Include the utility system data as well as data for the distribution system. When accurate data does not exist, assume that maximum available fault-current contribution exists, up to a possible infinite bus on the primary side of the upstream transformer, and design the system and equipment interrupting ratings assuming such conditions. Create additional short-circuit scenarios to estimate the commercial utility maximum/minimum short-circuit contribution when determining the worst-case arc flash arcing fault conditions. For systems with power generation equipment, include a short-circuit scenario for generator power load flow condition.

Note: In absence of known utility SCA data use minimum 100MVA SCA and maximum 500MVA SCA with value of 16 for X/R ratio for utility power source contribution.

b. Calculate the available short-circuit and ground-fault currents at each equipment bus.

c. Motor load short-circuit contribution may be estimated using ANSI-approved standard applications guides, refer to IEEE Std-551, section 6.8 in the absence for detailed motor load information.

d. Coordinate the calculated short circuit current at the service entrance with the available fault-current labeling required by the NEC for the service entrance equipment. Comply with IEEE C37.06, IEEE C37.13.1, or UL 489 criteria, as applicable, for equipment interrupting capability.

e. Final design studies shall be based on utility available fault-current contribution data calculated at the facility power service demarcation point.

f. Final design studies shall use PLFA calculation model results for determination of system motor load contribution.

5. Report Submission . Results of the short-circuit study shall be summarized in a final report containing the following items: a. Basis, description, purpose, and scope of the study.

b. Tabulations of the data used to model the system components and a corresponding one- line diagram.

c. Descriptions of the scenarios evaluated, and identification of the scenario used to evaluate equipment short-circuit current ratings.

d. Tabulations of power and current flow versus equipment ratings. The tabulation shall identify percentage of rated load and the scenario for which the percentage is based. Overloaded equipment shall be clearly noted.

4-2 07/06/2022 JO 6950.27B e. Tabulations of equipment short-circuit current ratings versus available fault duties. The tabulation shall identify percentage of rated short circuit current and clearly note equipment with insufficient ratings.

f. Conclusions and recommendations.

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07/06/2022 JO 6950.27B Chapter 5. Protective Device Coordination Analysis (PDCA) 1. Overview . Overcurrent protection and coordination is a fundamental requirement for proper operation of the power system. A PDCA is the comparison and selection of protective device operating times that achieves the objectives of the protection system under abnormal system conditions.

2. Objectives. Determine the characteristics, ratings, and settings of overcurrent protective devices that minimize equipment damage and interrupt short-circuits as rapidly as possible. The PDCA shall determine the following parameters: a. OCPD ratings and settings b. Overall system protection scheme c. Distribution equipment to ensure adequate system protection and selectivity d. Evaluate and coordinate the system protection scheme to mitigate arc-flash incident energy levels without compromising system protection and selectivity objectives.

3. Purpose . Selective coordination is both an art and a science. A perfectly coordinated system cannot always be accomplished. It is the responsibility of the design engineer to maximize coordination to the extent practical. The designer shall strive to achieve the following coordination objectives: a. Protection of people and equipment b. Continuity of power service c. The power distribution system protective devices should coordinate to a level such that no conductor, device, or circuit not directly critical to the safety function of Air Traffic systems, should ever cause or allow an interruption in service continuity to any device or circuit necessary for NAS safety. FAA critical power distribution systems (CPDS) may contain redundant power paths for reliability and maintainability. CPDS power paths shall achieve the following coordination objectives: (1) Coordination of redundant power systems shall coordinate to a level such that a fault on power path A, of a dual redundant distribution system, will not disrupt or interfere with the operation of power path B distribution system.

(2) Ensure selective coordination in the power path to critical loads. Total selective coordination is required to the available fault current between the load panelboard branch circuit breakers and the upstream protective devices, such as the panelboard main and upstream feeder protective devices.

(a) Exception: Total selective coordination may not be possible in existing facility power systems. The intent is to update the power system to extent possible within project funding constraints. The initial project planning process must assess system capabilities and address study requirements in the SOW. Where it is not possible to achieve total selective coordination due to lack of funding, the report must document the requirements/upgrades needed 5-1 07/06/2022 JO 6950.27B to achieve selective coordination for future project consideration. The Office of Primary Responsibility (OPR) should be contacted to obtain technical guidance on the applicability of requirements herein for modifications, upgrades, and new equipment installations in existing facilities.

d. Power system load continuity requirement may be considered in coordination selectivity analysis. The following conditions should be part of PDCA: (1) Unmanned NAS facilities and facility power circuits that supply power to equipment that directly controls the landing of aircraft, cannot tolerate power service interruptions and require selective coordination of protective devices. When difficulty is encountered meeting this requirement, consult the OPR of this document.

(2) Facility essential subsystem power loads, such as a chiller motor connected to the essential bus, may have less stringent selective coordination requirements. Redundant power distribution feeds should be considered for these conditions to improve system reliability.

4. Procedure . The coordination study shall be performed in accordance with the recommended practices and procedures set forth in ANSI/IEEE 399, Brown Book, and ANSI/IEEE 242, Buff Book. Protective device selection and settings shall comply with the system protection requirements of the NEC.

a. The maximum available-fault current or fractions of the maximum available fault- currents shall be used for the PDCA studies. PDCA, time-current coordination shall be based on the commercial utility available short-circuit data and the power systems installed equipment short-circuit contribution data.

b. AFRA, risk mitigation shall be coordinated during the PDCA process. AFRA shall consider both maximum and minimum short-circuit contribution data for PDCA, time-current coordination.

c. Ground fault protection coordination shall be a part of the report analysis. OCPD ground fault protection settings and sensing signals shall be verified during the commissioning in accordance with NEC requirements.

5. Coordination Guidelines . The following guidelines are intended to assist the PDCA process: a. Use the national standard designs for Critical Power Distribution System, Program Implementation Plan (P6980.00), wherever possible. Implementation of these designs or other non-standard designs should include engineering and selection of distribution OCPDs to achieve the systems coordination objectives. The following device selection considerations may be included in the design: (1) Use electronic, solid-state, circuit breakers with adjustable trip unit functions for main and feeder OCPD locations when this option is available for distribution equipment selection. Selection of adjustable trip device types is recommended to improve coordination discrimination and mitigate arc flash incident energies.

(2) Dynamic impedance. Dynamic impedance is not reflected in the instantaneous region of published time-current curve (TCC) graphical representations. OCPDs shall be selected based 5-2 07/06/2022 JO 6950.27B on manufacturer's published selectivity and coordination test data when such data is available.

Actual time-current TCC graphical representation is still valuable in long-time and short-time regions.

(3) Use OCPDs with large frame sizes at power source equipment mains and feeder branch locations where selectivity improvement in the instantaneous region is desirable.

Selection of device frame size and frame size pairing combinations must be coordinated with manufacturer’s application tables for selective coordination.

(4) Elimination of panelboard main circuit breaker devices may be considered, for purpose of minimizing the number of OCPDs along the coordination path, where the protection scheme is not compromised, however, in all cases system protection shall comply with the NEC.

The CPDS standard design configuration utilize instances where multiple overlapping protective devices in series are desirable, such as feeder and main circuit breaker combinations. These instances are commonly used for isolation purposes and provide a means for secondary protection to achieve desired selectivity at other points in the distribution system where coordination is paramount.

(5) AFRA generally requires fast short-time response characteristics. Consider setting the I T short-time delay feature to out/off setting whenever possible.

(6) Ground-fault protection may be added to protective device trip unit functions to detect and interrupt arcing fault-currents for AFRA risk mitigation.

(7) AFRA arc energy reduction systems shall be provided in accordance with NEC requirements. Preferred method to reduce device clearing time, in absence of OCPD trip unit adjustment settings, should use an energy-reducing maintenance switching scheme with local status indicator integrated into the distribution equipment layout.

b. Fire life safety systems, such as: fire alarm, emergency exit/egress lighting, fire pump, stair pressurization system, and elevator equipment shall be coordinated in accordance with NEC requirements.

c. Obtain available short-circuit contribution data from the commercial utility during initial design process.

d. Ensure that feeder conductors are selected to coordinate with the conductor protective device. The conductors thermal damage curve should not overlap the OCPD TCC in the instantaneous region.

e. Ensure that equipment protective devices are selected to coordinate with the equipment inrush-current requirements.

6. Report Submission . Results of the coordination study shall be summarized in a report containing the following items: a. Basis, description, purpose, methods and scope of the study, and a corresponding one-line diagram.

5-3 07/06/2022 JO 6950.27B b. Time-current curves, selective coordination ratios of fuses, or selective coordination tables of circuit breakers demonstrating the coordination of overcurrent protective devices to the scope.

c. Tabulations of protective devices identifying circuit location, manufacturer, type, and range of adjustment, and IEEE device number, and referenced TCC.

d. Tabulation of protective devices to summarize the settings selected for each protective device. Provide the following information as applicable: (1) Recommended settings or protective device type selection (2) Device identification name and associated load controlled (3) Circuit breaker sensor rating (4) Fuse type and rating.

(5) Relay current-transformer (CT) ratios and electronic set point equivalents for relay tap, time-dial settings, and instantaneous pickup points.

(6) Ground-fault pickup and time delay settings (7) Differential relay settings (8) Current transformer ratios.

e. Conclusions and Recommendations.

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07/06/2022 JO 6950.27B Chapter 6. Arc-Flash Risk Assessment (AFRA) 1. General Overview . Arc-Flash analysis is a fundamental power system design requirement.

The design requires an iterative process to ensure proper system protection, selective coordination, and reduction of arc flash incident energies.

2. Objectives . Determine arc-flash incident energy levels and arc-flash protection boundary distances based on the results of the short-circuit and coordination studies. The analysis must determine the worst-case arc-flash conditions for power system operating modes.

The AFRA shall be performed to calculate the arc-fault current and incident energy values for each element in the facility power system or Electrical Line Distribution (ELD) project power system. The study shall include the following: a. The AFRA shall calculate incident energy associated with 100% available fault-current and 50% of available fault-current contribution. Utility data must be used for the 100% available fault-current level.

b. Evaluate distribution equipment to ensure adequate system protection and selectivity.

c. Evaluate and coordinate the system protection system settings to mitigate arc-flash incident energy levels without compromising system protection and selectivity objectives.

d. Documented effort must be made to reduce incident energy to the lowest levels possible.

3. Purpose . Determination of following parameters: a. Equipment arc-flash warning label parameters.

b. Prepare equipment arc-flash warning labels in accordance with Air Traffic Organization Electrical Safety Program (JO 3900.64) requirements.

4. Procedure . Calculate the arcing fault current flowing through each branch for each fault location in accordance with NFPA 70E, IEEE 1584, and Occupational Safety and Health Administration (OSHA) 1910.269 applicable standards.

a. Collect the system and installation data and prepare a one-line diagram of the power system.

b. Determine system operating modes including tie-breaker positions, and parallel generation configurations.

c. Perform a short-circuit study in accordance with Section SCA.

d. Perform a coordination study in accordance with Section PDCA.

e. Determine the time required to clear the arcing fault current using the protective device settings and associated trip curves.

6-1 07/06/2022 JO 6950.27B f. Determine typical gap and enclosure size based upon system voltages and equipment classification.

g. Determine the equipment electrode configuration.

h. Select the working distances based on system voltage and equipment classification.

i. Calculate the incident energy at each fault location at the prescribed working distance.

j. Determine the arc-flash hazard personal protective equipment (PPE) category for the calculated incident energy level.

k. Calculate the arc-flash protection boundary at each fault location.

l. Document the assessment in reports and one-line diagrams.

m. Fabricate and install equipment warning labels on distribution equipment in accordance with Order JO 3900.64.

5. Report Submission . Results of the arc-flash hazard study shall be summarized in a final report containing the following items: a. Basis, method of hazard assessment, description, purpose, scope, and date of the study.

b. Tabulations of the data used to model the system components and a corresponding power one-line diagram.

c. Document selection of the equipment electrode configurations.

d. Provide annotated power one-line diagram showing input data and arc-flash results data for each equipment bus according to each study scenario.

e. Descriptions of the scenarios evaluated, and identification of the scenario used to develop incident-energy levels and arc-flash boundaries.

f. Tabulations of equipment incident energies, arc-flash hazard PPE categories, and arc- flash boundaries. The tabulation shall identify and clearly note equipment with prohibited energized work locations that exceeds 40 cal/cm incident energies.

g. Conclusions and recommendations.

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07/06/2022 JO 6950.27B Chapter 7. Harmonic Analysis 1. Overview . Harmonic analysis includes the following parts: a. Calculation of harmonic bus voltages and branch current flows in the power distribution system due to harmonic sources.

b. Performance indices that calculate the effects of harmonics on voltage or current waveform distortion.

c. Conduct calculations in accordance with IEEE Std 519 IEEE Recommended Practice and Requirements for Harmonic Control in Electric Power Systems, 3/27/2014.

2. Objectives . Determination of following parameters: a. Prepare a system power one-line diagram.

b. Gather nameplate data and ratings for harmonic generating equipment.

c. Determine location of nonlinear loads and the generated harmonic currents.

d. Obtain from the power utility company the relevant data and harmonics at the PCC.

Provide the following information as applicable: (1) The short-circuit capacity and X/R ratio of the utility power system at PCC.

(2) Subtransient reactance and kVA rating of rotating machines large than 50hp.

(3) Reactance and resistance of power feeders and current limiting reactors part of the distribution system one-line diagram.

(4) Three phase power transformer kVA rating and percent impedance values.

(5) Permissible limits on harmonics including distortion factors and IT factor per.

3. Purpose . The harmonic analysis provides information to verify adequacy of power system calculations and distribution equipment selections. The project planning and initial design requires careful collection of data, verification, and documentation of the BOD.

4. Calculations . The analysis shall include system salient power-flow operating scenarios such as utility and generator power operating modes.

a. Calculate individual and total harmonic voltage and current distortion factors and applicable IT values at the point of common coupling.

5. Report Submission . Provide a report containing the following items: a. Basis, description, purpose, and scope of the study.

b. Tabulations of the data used to model the system components and a corresponding power one-line diagram.

7-1 07/06/2022 JO 6950.27B c. Description of power flow operating scenarios.

d. Tabulation of individual and total harmonic voltage and current distortion factors and applicable IT values at the point of common coupling.

e. Tabulation of results consolidated into a summary report.

f. Provide recommendation for harmonic mitigation approach for systems that exceed permissible distortion limits.

6. Application of Harmonic Limits . IEEE 519 provides recommended harmonic voltage and current limits applicable at the PCC. Harmonic voltage limits are characterized by total harmonic distortion percentage. Harmonic current limits are characterized by total demand distortion (TDD).

a. IEEE 519 harmonic limits apply only at the point of common coupling and should not be applied to either individual pieces of equipment or at locations within the facility.

b. The PCC is intended to be applied at the point of demarcation between the commercial electric utility distribution system and the facility’s power distribution system.

(1) In general, the PCC is located at the primary side of the facility service transformer.

(2) The IEEE standard allows for the same harmonic analysis procedure to be applied at other locations of interest within a facility where it is important to ensure adequate power system operation, such as a facility’s main distribution point, or the interface point for on-site power generation equipment.

(3) A facility with multiple commercial utility power feeds may have multiple PCC utility interface locations.

c. Provide harmonic analysis calculations for the facility PCC and other key distribution points.

(1) The facility main distribution point may be located on the secondary of the incoming utility service if access to the primary distribution system is not available.

(2) Sites with power generation equipment should include harmonic analysis for load flow scenarios connected to the generator system.

(a) Determine appropriate power load flow scenarios to establish a basis for the system demand load requirement. The demand load should be normal steady-state operating condition.

(b) Generator system TDD harmonic current limits must be based on IEEE 519, Table 2, note-c, exception values. The harmonic analysis must consider overall power system voltage and power factor stability requirements when implementing harmonic mitigation equipment.

(i) If TDD harmonic limits cannot be achieved without effecting the generator system performance throughout all power load flow scenarios, or in absence of abnormal operating conditions, the harmonic current distortion limits may be exceeded to ensure stability of the generator power system.

7-2 07/06/2022 JO 6950.27B (ii) Passive harmonic filtering equipment that may alter system power factor, impedance, and harmonics as demand load scenarios change should be avoided.

(iii) Harmonic mitigation equipment must include features to disable filtering if the connected power load is not operating within the filter design specifications.

7. Harmonic Analysis Calculation Considerations . The harmonic calculation model should include the following power system components: a. Commercial Electric Utility: (1) The utility short-circuit data and power system demand load requirement must be obtained to establish a basis for system short-circuit ratio.

(2) Short-circuit ratio is the ratio of the available short-circuit current, in amperes, to the load current, in amperes.

b. Power Factor Capacitors: (1) Power factor capacitors must be included in the model when power factor correction equipment is used or exists within the existing power distribution system.

c. Transformers: (1) Model transformers using equipment nameplate percentage impedance information.

The transformer’s actual X/R ratio should be used if readily available.

(2) An estimated X/R ratio of 10 may be used if actual transformer data is not available.

The transformer resistance will change with frequency; however, the X/R ratio may be considered constant for harmonic modeling purposes.

(3) Transformer winding phase shift must be considered between delta and wye winding configurations.

d. Cable Impedance: (1) Conductor impedance generally is not significant for harmonic modeling purposes.

Conductor information may be used where information is known. Cables will have the effect of dampening the system response at or near a resonant frequency.

e. Motor Loads: (1) Significant motor loads should be modeled by their subtransient reactance which can be approximated based on locked rotor current if reactance data is unknown.

(2) Large motors exceeding 50 Hp should be modeled individually. Other motor loads may be lumped together and modeled as a single impedance. Motors have the effect of raising the parallel resonant frequency of the power system.

f. Harmonic Loads: (1) Model nonlinear loads as multiple current sources, one for each characteristic frequency.

7-3 07/06/2022 JO 6950.27B g. Other Loads: (1) System linear loads should be modeled as an inductive and resistive component. The inductive component of the load will have the effect of raising the natural frequency of the system. The resistive component will lower the peak of a resonance.

7-4

07/06/2022 JO 6950.27B Chapter 8. Administrative Information 1. Distribution . This order will be distributed electronically.

2. Background . The following delivery process flow chart describes the fundamental compliance paths for this order.

Figure 8-1. Delivery Process Flow Chart 8-1 07/06/2022 JO 6950.27B This Page Intentionally Left Blank 8-2

07/06/2022 JO 6950.27B Appendix A Appendix A. Acronyms and Abbreviations The following acronyms and abbreviations are essential to the application of this order. It is not intended to include commonly defined general or technical terms from related codes and standards.

Acronym Definition A ac alternating current AFRA arc-flash risk assessment ANSI American National Standards Institute ATC Air Traffic Control ARMS Arc-flash Reduction Maintenance System ATO Air Traffic Organization D dc direct current E ELD electrical line distribution EG Engine-Generator EOSH Environmental and Occupational Safety and Health ERMS Energy Reduction Maintenance Setting Switch F FAA Federal Aviation Administration FRDF facility reference data file FPPS Facility Power Schedule - FAA document archive data system database G GF ground-fault GFCI ground-fault circuit interrupter GFP ground-fault protection of equipment I I T Current Squared times Time IEEE Institute of Electrical and Electronics Engineers L LF load-flow LFA load-flow analysis L-G Line-to-Ground L-L Line-to-Line L-N Line-to-Neutral N NAS National Airspace System NEC National Electrical Code NEMA National Electrical Manufacturers Association NFPA National Fire Protection Association A-1 07/06/2022 JO 6950.27B Appendix A O OCP overcurrent protection OCPD overcurrent protective device OPR Office of Primary Responsibility OSHA Occupational Safety and Health Administration P PDC protective device coordination PDCA protective device coordination analysis PLF power load-flow PLFA power load-flow analysis PPE personal protective equipment PV photovoltaic - power system R RFDF facility reference data file rms root-mean-square S SC short-circuit SCA short-circuit analysis SDM service disconnecting means SOW statement of work SPD surge protective device SSC system support center (FAA Acronym) Std standard T TCC time-current curve U UPS uninterruptible power supply A-2

07/06/2022 JO 6950.27B Appendix B Appendix B. Key Terms and Definitions 1. Overview . The following contain only definitions essential to the application of this order. It is not intended to include commonly defined general or technical terms from related codes and standards.

2. Definitions . The terms used within this order are provided as follows: A Ampacity The maximum current, in amperes, that a conductor can carry continuously under the conditions of use without exceeding its temperature rating.

B Battery System Interconnected battery subsystems consisting of one or more storage batteries and battery chargers, and can include inverters, converters, and associated electrical equipment.

Branch Circuit The circuit conductors between the final overcurrent device protecting the circuit and the outlet(s).

C Circuit Breaker A device designed to open and close a circuit by nonautomatic means and to open the circuit automatically on a predetermined overcurrent without damage to itself when properly applied within its rating.

Adjustable (as applied to circuit breakers) . A qualifying term indicating that the circuit breaker can be set to trip at various values of current, time, or both, within a predetermined range.

Instantaneous Trip (as applied to circuit breakers). A qualifying term indicating that no delay is purposely introduced in the tripping action of the circuit breaker.

Inverse Time (as applied to circuit breakers). A qualifying term indicating that there is purposely introduced a delay in the tripping action of the circuit breaker, which delay decreases as the magnitude of the current increases.

Nonadjustable (as applied to circuit breakers). A qualifying term indicating that the circuit breaker does not have any adjustment to alter the value of the current at which it will trip or the time required for its operation.

Setting (of circuit breakers). The value of current, time, or both, at which an adjustable circuit breaker is set to trip.

Continuous Load A load where the maximum current is expected to continue for 3 hours or more.

B-1 07/06/2022 JO 6950.27B Appendix B Coordination, Localization of an overcurrent condition to restrict outages to the circuit Selective, or equipment affected, accomplished by the selection and installation of (Selective overcurrent protective devices and their ratings or settings for the full Coordination) range of available overcurrents, from overload to the maximum available fault current, and for the full range of overcurrent protective device opening times associated with those overcurrents.

D Demand Factor The ratio of the maximum demand of a system, or part of a system, to the total connected load of a system or the part of the system under consideration.

Disconnecting A device, or group of devices, or other means by which the conductors Means of a circuit can be disconnected from their source of supply.

Duty, Continuous Operation at a substantially constant load for an indefinitely long time.

Duty, Intermittent Operation for alternate intervals of (1) load and no load; or (2) load and rest; or (3) load, no load, and rest.

Duty, Periodic Intermittent operation in which the load conditions are regularly recurrent.

Duty, Short-Time Operation at a substantially constant load for a short and definite, specified time.

Duty, Varying Operation at loads, and for intervals of time, both of which may be subject to wide variation.

Equipment The conductive path installed to connect normally non-current-carrying Grounding metal parts of equipment together and to the system grounded conductor Conductor (EGC) or to the grounding electrode conductor, or both. For FAA purposes, the EGC is to be green-insulated, solid or stranded, copper wire.

F Fuse An overcurrent protective device with a circuit-opening fusible part that is heated and severed by the passage of overcurrent through it.

Form/Fit/Function, Replacement of existing equipment with new equipment that has the Equipment same characteristics, such as the following categories: Replacement a. Form (of the equipment). Describes physical and electrical parameters.

b. Fit (of the equipment). The ability to interface with, be connected to, or become an integral part of another item c. Function (of the equipment). The action(s) that the equipment is designed to perform.

G Ground A conducting connection, whether intentional or accidental, between an electrical circuit or equipment and the earth, or to a conducting body that serves in place of the earth.

Grounded Connected to earth via a path of sufficiently low impedance and having sufficient current carrying capacity, such that fault current cannot build up voltage potentials that are hazardous to personnel.

B-2 07/06/2022 JO 6950.27B Appendix B Grounded, Solidly Connected to ground without inserting any resistor or impedance device.

Grounded A system or circuit conductor that is intentionally grounded at the SDM Conductor or at the source of a separately derived system. This grounded conductor is the neutral conductor for the power system.

Grounding A conductor used to connect equipment or the grounded circuit of a Conductor wiring system to a grounding electrode or electrodes.

Grounding Copper rod, plate, or wire embedded in the ground for the specific Electrode purpose of dissipating electric energy to the earth. Also referred to as the Grounding Electrode System.

Grounding A conductor used to connect the system grounded conductor or the Electrode equipment to a grounding electrode or to a point on the grounding Conductor electrode system.

Ground Fault An unintentional, electrically conductive connection between an ungrounded conductor of an electrical circuit and the normally non- current-carrying conductors, metallic enclosures, metallic raceways, metallic equipment, or earth.

Ground Fault A device intended for the protection of personnel that functions to Circuit Interrupter denergize a circuit or portion thereof within an established period of time when a current to ground exceeds 6 mA.

Ground Fault A system intended to provide protection of equipment from damaging Protection of line-to ground fault currents by operating to cause a disconnecting Equipment means to open all ungrounded conductors of the faulted circuit. This protection is provided at current levels less than those required to protect conductors from damage through the operation of a supply circuit overcurrent device.

L Labeled Equipment or materials to which has been attached a label, symbol, or other identifying mark of an organization that is acceptable to the authority having jurisdiction and concerned with product evaluation, that maintains periodic inspection of production of labeled equipment or materials, and by whose labeling the manufacturer indicates compliance with appropriate standards or performance in a specified manner.

Listed Equipment, materials, or services included in a list published by an organization that is acceptable to the authority having jurisdiction and concerned with evaluation of products or services, that maintains periodic inspection of production of listed equipment or materials or periodic evaluation of services, and whose listing states that either the equipment, material, or service meets appropriate designated standards or has been tested and found suitable for a specified purpose.

O Office of Primary The authority assigned to maintain and interpret this order.

Responsibility (OPR) B-3 07/06/2022 JO 6950.27B Appendix B Overcurrent Any current in excess of the rated current of equipment or the ampacity of a conductor. It may result from overload, short circuit, or ground fault.

Overcurrent A device capable of providing protection for service, feeder, and branch Protective Device circuits and equipment over the full range of overcurrents between its rated current and its interrupting rating. Such devices are provided with interrupting ratings appropriate for the intended use but no less than 5000 amperes.

Overcurrent A device intended to provide limited overcurrent protection for specific Protective Device, applications and utilization equipment such as luminaires and Supplementary appliances. This limited protection is in addition to the protection provided in the required branch circuit by the branch circuit overcurrent protective device.

P Premises Wiring Interior and exterior wiring, including power, lighting, control, and (System) signal circuit wiring together with all their associated hardware, fittings, and wiring devices, both permanently and temporarily installed. This includes (a) wiring from the service point or power source to the outlets or (b) wiring from and including the power source to the outlets where there is no service point (Refer to NEC).

S Separately Derived An electrical source, other than a service, having no direct connection(s) System to circuit conductors of any other electrical source other than those established by grounding and bonding connections.

Service The conductors and equipment for delivering electric energy from the serving utility to the wiring system of the premises served.

Service Conductors The conductors from the service point to the service disconnecting means.

Service Equipment The necessary equipment, usually consisting of a circuit breaker(s) or switch(es) and fuse(s) and their accessories, connected to the load end of service conductors to a building or other structure, or an otherwise designated area, and intended to constitute the main control and cutoff of the supply.

Service Point The point of connection between the facilities of the serving utility and the premises wiring (Refer to NEC).

Short-Circuit The prospective symmetrical fault current at a nominal voltage to which Current Rating an apparatus or system is able to be connected without sustaining damage exceeding defined acceptance criteria.

Surge Protective A device intended to limit surge voltages on equipment by diverting or Device (SPD) limiting surge current and is capable of repeating these functions as specified. SPDs are also commonly referred to as Transient Voltage Surge Suppressors or secondary surge arresters.

V Voltage The greatest root-mean-square (rms) (effective) difference of potential (of a circuit) between any two conductors of the circuit concerned.

B-4 07/06/2022 JO 6950.27B Appendix B Voltage A nominal value assigned to a circuit or system for the purpose of (Nominal) conveniently designating its voltage class (e.g., 120/240 volts, 480Y/277 volts, 600 volts).

B-5 07/06/2022 JO 6950.27B Appendix B This Page Intentionally Left Blank B-6

07/06/2022 JO 6950.27B Appendix C Appendix C. Applicable Codes and Standards 1. Overview . The latest editions of the following publications are the primary reference documents for this order. Use latest versions of the documents.

a. Documents listed in this section are government and non-government reference documents that form a part of this order and are applicable to the extent specified herein. While every effort has been made to ensure the completeness of this list, document users are cautioned that they shall meet specified requirements of documents cited in Chapters of this order, and national safety standards, whether or not they are listed.

b. In the event of a conflict between the text of this standard and the references cited herein, the text of this standard takes precedence. Nothing in this standard shall supersede applicable laws and regulations unless a specific exemption has been obtained.

2. Government Documents .

FAA-G-2100 Electronic Equipment, General Requirements FAA-STD-032 Design Standards for National Airspace System Facilities FAA - JO 3900.64 Air Traffic Organization Electrical Safety Program FAA - JO 6080.1 Facility Power Panel Schedule (FPPS) FAA-Order-3900.19B Occupational Safety and Health Program FAA-P6980.00 Critical Power Distribution System, Program Implementation Plan 3. Non-Government Documents .

Due to periodic updating of non-government documents, the Contracting Officer and/or the Implementation Engineer must specify the current version for project design or at contract award unless a specific version is identified in this standard. These documents form a part of this standard and are applicable to the extent specified herein. While this standard may exceed the requirements of the following documents, building codes and industry standards always shall be performed as a minimum.

4. National Fire Protection Association (NFPA) .

NFPA 70 National Electrical Code (NEC) NFPA 70B Recommended Practice for Electrical Equipment Maintenance NFPA 70E Standard for Electrical Safety in the Workplace 5. Institute of Electrical and Electronic Engineers (IEEE) .

Recommended Practice for Electric Power Distribution for IEEE Std 141 Industrial Plants Recommended Practice for Protection and Coordination of IEEE Std 242 Industrial and Commercial Power Systems C-1 07/06/2022 JO 6950.27B Appendix C Recommended Practice for Calculating Short-Circuit Currents in IEEE Std 551 Industrial and Commercial Power Systems Recommended Practice for Industrial and Commercial Power IEEE Std 399 Systems Analysis IEEE Std 3000 IEEE Standards Collection: Protection and Coordination IEEE Std 1584 Guide for Performing Arc Flash Hazard Calculations C-2

07/06/2022 JO 6950.27B Appendix D Appendix D. Power Study Decision Process Assessment Guidelines 1. Overview . This section provides informative guidance related to equipment evaluation and factors that may affect the level of analysis, assessment, and the need for calculations. These conditions are typically related to design, renovation, refurbishment, or modification of existing power distribution systems.

2. Assessment Considerations . The following list includes equipment categories that are part of the assessment and decision process: a. Distribution Transformer b. ELD, Power Cables and Conductors c. Commercial Utility Transformer or Service Entrance Conductors d. Service Entrance Equipment e. Engine-Generator (EG) f. Power Panels g. UPS Equipment (excluding rack-mounted equipment) h. Power Feeder, Circuit Breaker Protective Devices with adjustment set points.

i. Addition of Alternative Energy Power Sources j. Motor Loads k. Equipment Serviced by Form/Fit/Function Replacement.

Update or provide new power study report if the assessment determines existing FPPS database calculations models or documentation are invalidated by the conditions described below.

3. Distribution Transformer .

a. Conditions: (1) Addition of new equipment (2) Change in load capacity or system impedance ratings (3) Form/Fit/Function replacement.

4. ELD, Power Cables, and Conductors .

a. Conditions: (1) Addition of new equipment (2) Change in load capacity or system impedance ratings (3) Form/Fit/Function replacement.

D-1 07/06/2022 JO 6950.27B Appendix D 5. Commercial Utility, Transformer, or Service Entrance Conductors .

a. Conditions: (1) Addition of new equipment (2) Change in load capacity or system impedance ratings (3) Form/Fit/Function replacement.

6. Service Entrance Equipment .

a. Conditions: (1) Addition of new equipment (2) Changes to protective device settings (3) Fuse replacement, if identical fuse type and ratings are not used (4) Form/Fit/Function replacement.

7. Engine-Generator, EG .

a. Conditions: (1) Addition of new equipment - Notes Applicable for New Equipment Installation:.

(a) Worst case scenarios of impedances shall always be considered.

(b) Generator sub-transient direct axis reactance X”d, negative sequence reactance X2, and zero sequence reactance Xo shall be considered.

(c) If the value of X”d is specified by the generator manufacturer as a range, use the minimum value of X”d. For example, if the data sheet lists the subtransient reactance as 0.2 ohm ± 15% then the worst-case value of X”d should be calculated as 0.2 * ((100 - 15)/100) = 0.17 ohm.

(d) Addition of a new engine generator to an electrical power distribution system to operate as a stand-alone prime power source, or stand-by alternative power source, or operate in a parallel configuration, generally increases the resultant value of arc flash incident energy. It is imperative that calculation scenarios are evaluated in order to capture the worst-case operating conditions for arc flash incident energy analysis.

(e) If the generator is solidly-grounded then ground-fault current can exceed the value of the three-phase fault current. Short-Circuit calculations shall include both 3-phase fault {Isc, 3-phase = EL-G / X”d}, and single-phase to ground-fault current {Isc, 1-phase to GF = 3 * EL-G / (X”d+ X2+ Xo)} conditions. Where, EL-G is the Line-to-Ground Generator voltage, typically 277 Volts or 120 Volts.

(f) Changing the location of the Generator installation with respect to the power system distribution equipment can affect the resultant short-circuit and arc-flash incident energy calculations.

D-2 07/06/2022 JO 6950.27B Appendix D (g) Close proximity of the power system distribution equipment and the Generator equipment generally results in higher short-circuit current values. The power feeder conductor reactance X and the resistance R may be are considered negligible when the EG is located within close proximity, less than 25-feet) of the generator output distribution equipment.

(2) Form/Fit/Function replacement - Notes Applicable for Equipment Replacement: (a) Replacement of EG with an identical unit generally does not result in a change of incident energy; however, during the assessment process the qualified engineer shall evaluate the following parameters that affect the fault current calculation: (i) Generator volt-ampere (VA) rating (ii) Power-Factor, (PF) rating (iii) System Voltage configuration (iv) Subtransient, direct-axis reactance value (v) Negative sequence reactance value (vi) Zero sequence reactance value.

(b) Replacement of an EG with a unit manufactured by a different manufacturer may not require calculation updates. The qualified engineer shall compare the parameters of the proposed and existing EG units to determine if there is a need to perform new calculations.

8. Power Panels .

a. Conditions: (1) Addition of new equipment.

(2) Form/Fit/Function replacement. A power study is not be required if a panel replacement does not change the feeder power conductors or OCPD ratings: Note: There are special considerations for panels that are remotely located at large distance from the upstream protective device. The following considerations are applicable for panels remotely located from its upstream feeder circuit breaker protective device: (a) Feeder circuit breakers protecting long distance feeders may not be able to sense a fault condition due to the attenuation of the short circuit current at the load panel resulting from higher feeder impedances. The qualified registered engineer shall provide recommendations to resolve the following design considerations: (i) Inability of the feeder circuit breaker to sense and automatically open the circuit in case of a low-level fault current conditions.

(ii) The elevated amount of incident energy due to an elongated upstream feeder circuit breaker tripping time to open the circuit and clear the fault-current condition.

(b) Panels mounted remotely from power distribution source equipment, such as panels mounted in the cab of an Air Traffic Control Tower or a panel mounted outdoor in a D-3 07/06/2022 JO 6950.27B Appendix D security guard house and fed from the base building distribution system, shall be identified and evaluated separately.

9. Uninterruptible Power Supply (UPS) Equipment (excluding rack-mounted equipment) .

a. Conditions: (1) Addition of new equipment.

(2) Form/Fit/Function replacement: Note: The UPS manufacturer data must be considered carefully. The level of arcing fault current in relation to the overload rating of the UPS can affect the calculations for the following case scenario conditions: (a) Case 1: Arcing fault currents significantly higher than the overload rating of the UPS may immediately cause the UPS to switch power flow to the bypass circuit. This is the typical default short-circuit power-flow scenario to be modeled in short-circuit calculations.

(b) Case 2: Arcing fault currents from a UPS that are lower than overload rating of the UPS and may not result in the UPS switching power-flow to the bypass circuit.

(c) Case 3: Arcing fault currents slightly higher than the overload rating of the UPS may result in a parallel operation of the UPS and the bypass circuit for an approximately 40 milliseconds.

Note: Cases 2 and 3 are to be included in advanced studies where more investigation is required to establish the proper arcing-fault current values.

10. Power Feeder, Circuit Breaker Protective Devices .

a. Conditions: (1) Addition of new equipment (2) Changes to circuit breaker settings (3) Form/Fit/Function replacement.

11. Addition of Alternative Energy Power Sources .

a. Conditions: (1) Addition of new equipment (2) Form/Fit/Function replacement.

Note: Refer to FAA-E-99001, Photovoltaic Specification for Arc Flash analysis requirements.

12. Motor Loads .

a. Conditions: (1) Addition of new equipment D-4 07/06/2022 JO 6950.27B Appendix D (2) Form/Fit/Function replacement: Note: Motor loads greater than or equal to 50 hp require consideration for the following parameters that may affect calculations. Modifications of the following parameters may affect the calculations.

(a) Addition of motor loads greater than or equal to 50 hp. Multiple motor loads may be grouped in to combined loads totaling 50 hp or greater and modeled as a single motor load.

(b) Modification of motor controller or starter type for motor loads greater than or equal 50 HP. When equipped with a bypass circuit, the default power-flow scenario to be modeled in short-circuit calculations should utilize the bypass circuit. The following are common motor starter types: (i) Direct-on-line or across-the-line motor starters (ii) Reduced voltage starters (iii) Variable Frequency Drive (VFD) units (iv) Electronic, Solid-State, Soft Starters (v) Smart motor controllers, equipped with a bypass circuit.

13. Equipment Serviced by Form/Fit/Function Replacement .

Update study as applicable.

14. Data Acquisition Template Forms .

The following tables indicate data that shall be documented when conducting Power Studies.

a. The power study shall include a Power One-Line Diagram showing configuration of the calculation model.

b. Provide itemized table listings for all elements included in the calculation model.

The following are illustrative examples for data table templates. Contractor shall add equipment serial numbers to tables when the information is available.

D-5 07/06/2022 JO 6950.27B Appendix D Table D-1. Power Source Equipment, Data Collection Tables Commercial Utility Short-Circuit Contribution Data Item Utility Name 3-Phase Line to Ground Short- X/R X/R Rated No. Short-Circuit Circuit Contribution (3phase) (Line to Voltage Contribution MVA MVA ground) Max. Min Max. Min.

1.

Table D-2. Generator Equipment, Data Collection Table Engine-Generator Nameplate and Short-Circuit Contribution Data Item Gen. Name, Manufacturer Rated PF Rated Serial ANSI Transient and No. or Location kVA Voltage Number/ CONTRIBUTION Steady State Catalog Parameter 1.

Seq. X” X/R Xd' Xd Ra + - Td” Td' Tdc Table D-3. Power Transformer Equipment, Data Collection Table Transformer Nameplate Data Type of Type of XFMR #of Rated Rated Rated Connection XFMR In-rush Item name or Phases kVA PF Primary Z% Secondary e.g. (Li-Y) (Dry, oil) current No. Location Voltage Voltage Table D-4. Conductor and Cable, Data Collection Table Conductor and Cable Data Cable Number of Size Conductor Item Identification Parallel (AWG, kCMIL) Insulation Class Description Length (ft) No. or Number Conductors e.g. (4- 1/C+G) /Phase 1.

Note: Itemize all conductors and cables used i n the system one - line diagram.

D-6 07/06/2022 JO 6950.27B Appendix D Table D-5. Power Fuse, Data Collection Table Power Fuse Device Data Item Location& Type Rated V Trip Manufacturer Interrupting TCC No. Identification Current Rating No.

1.

Table D-6. Electronic Circuit Breaker, Data Collection Table Circuit Breaker (Electronic, Solid-State, Trip Unit) Device Data Item Location & Type, Frame Manufacturer Rated Frame Plug Sensor Trip Description, No. Identification (letters), Voltage Rating (A) (A) Current, TCC No.

Interrupting (A) Rating Trip Device Unit #, Settings: LTPU LTD STPU INST GFPU GFD Equipment Options: ERMS ARMS 1.

Table D-7. Thermal Magnetic Circuit Breaker, Data Collection Table Circuit Breaker (Thermal Magnetic Trip Unit) Device Data Item Location & Type, Frame Manufacturer Rated Frame Interrupting Trip Description, No. Identification (letters) Voltage Rating Rating Current TCC No.

(A) 1.

Table D-8. Equipment Power Loads, Nameplate Data Collection Table Equipment Power Load Data No. Load Location & kVA or kW PF Rated Voltage Rated current Identification 1.

D-7 07/06/2022 JO 6950.27B Appendix D Table D-9. Motor Equipment, Nameplate Data Collection Table Motor Equipment Data No. Motor Location & Rated PF Rated Voltage Rated current Locked- Identification HP Rotor or kVA, kW kVA/HP 1.

Table D-10. Automatic Transfer Switch (ATS), Nameplate Data Collection Table Automatic Transfer Switch (ATS) Equipment Data No. Location & Model No. Poles Rated Voltage Rated current Serial No. Options Identification 1.

Table D-11. Static Transfer Switch (STS), Nameplate Data Collection Table Static Transfer Switch (STS) Equipment Data No. Location & Model No. Poles Rated Voltage Rated current Serial No. Options Identification 1.

D-8

07/06/2022 JO 6950.27B Appendix E Appendix E. Load Analysis Report – Illustrative Example 1. Overview . This section provides guidance material for the preparation of a load analysis report and it is intended to illustrate means, but not necessarily the only means, of complying with requirements in this document.

2. Objectives . The project type definition will establish the type and extent of study required.

This section is tailored to suite a new design project with an initial design submission and follow-on design submissions extending to the final design and construction phases. In general, the studies required for a new design project includes: a. Initial Concept Design Submission – Load Analysis Report b. Intermediate Design and Follow-on Submissions – Power Study Report.

The power study report example is shown in Appendix D, and includes the following parts: a. Power load-flow analysis b. Short-circuit analysis c. Protective device coordination analysis d. Arc-flash risk assessment.

The studies may be tailored to suite other project definition types in accordance with Chapter 2 requirements.

3. Purpose . The illustrative example provides criteria and methods to prepare a report. The project scope definition must be determined during initial project planning process to ensure the proper application of requirements. The report format must be in accordance with Chapter 2 deliverable and archival storage requirements.

4. Load Analysis Report . The basic principle of an electrical power load analysis requires a listing of system power loads categorized by system and load type. The initial preliminary load analysis is intended to determine the total aggregate steady-state power load requirement for proper selection of characteristics and capacity of power source equipment.

The load analysis is the initial starting point for implementing electrical power design projects.

The results of the load analysis are intended to inform the reader of criteria and material necessary to establish the basis for the project’s follow-on electrical design phases. The load data should be updated where appropriate for follow-on design submissions to ensure accuracy of data and document initial design assumptions.

The load analysis report content should be organized into following parts: a. Section 1 – Executive Summary (1) Provide a brief introduction and project definition summary. Include assumptions and criteria references.

(2) Provide a listing of design standards and references used for the design.

E-1 07/06/2022 JO 6950.27B Appendix E b. Section 2 – Design Analysis (1) Provide a design analysis narrative with project description. List any special features and alternative considerations.

(2) Provide a summary of the distribution system operating characteristics and capacity requirements such as, system voltage classification, power sources kVA/kW capacity, and distribution branch power operating modes.

(3) Provide an elemental power connection diagram illustrating configuration and distribution system topology.

c. Section 3 – AC and/or DC Load Analysis – Tabulation of Connected Loads (1) Provide a listing of system loads categorized by type: (a) Life safety equipment (b) Lighting (c) General purpose power and receptacle plug loads (d) Critical/UPS electronic equipment loads (e) Mechanical - air ventilation equipment (f) Mechanical - air conditioning equipment (g) Mechanical - humidification equipment (h) Mechanical - electric heating equipment (i) Mechanical - chiller equipment (j) Mechanical - chilled water pumping system (k) Mechanical - pumping equipment (l) Fire protection - pumping system.

d. Section 4 – Power Source Equipment – Load Capacity Tabulation (1) Provide a listing of applicable power source equipment: (a) Commercial utility electric service entrance equipment (b) Generator power source equipment (c) Uninterruptible power source (UPS) equipment (d) DC power source equipment.

e. Section 5 – Conclusion (1) Provide a brief summary of follow-on project design phase activities. The load analysis results are intended to provide necessary input data for project follow-on design phase power study submissions.

(2) The conclusion should include statements that document design decisions reached throughout the design process.

E-2 07/06/2022 JO 6950.27B Appendix E 5. Load Analysis Report – Illustrative Example . This section contains an example load analysis report.

Note: Provide a brief design narrative describing the objectives and purpose for the report. This example report document should not be read as a template or used as a form to fill in. The user is responsible for the final content and report format. The example calculations provided are intentionally over-simplified to clarify the process involved. They do not provide definitive numbers or values and are for guidance only.

a. Section 1 – Executive Summary . This document describes the basic electrical distribution system architecture and provides preliminary electrical load analysis for development of the project program requirements. The load analysis is intended to define preliminary capacity requirements for power source equipment needed to support the facility’s expected electrical loads.

b. Section 2 – Design Analysis (1) Project facility type definition: (a) Air Traffic Control Tower (ATCT) and Base Building: 10,000 gross sq-ft (b) ATC Activity Level: Low (c) ATCT Cab Size: 550 sq-ft, 4 controller positions (d) ATCT Height: Number of shaft floor levels, six, (86’-0” height from grade to cab floor) (e) Site Area: 62,000 sq-ft (f) Site Parking: 10 parking positions (g) Security Perimeter Fencing: 450 lf.

(2) Power distribution system characteristics: (a) Simple Radial Distribution Configuration (b) Service Voltage Classification: 208Y/120V, 3-phase, 4-wire, 60 Hz (c) Power Source: commercial utility (d) Alternate Power Source: standby diesel-engine generator (e) Distribution Branches: Normal, Essential, Fire Life Safety, and Critical.

(3) Mechanical system characteristics: (a) Chilled water system with redundant air-cooled chillers and electric heating equipment.

(b) Air handling units will provide facility ventilation air. The air handlers include chilled water and electric heating coils.

(c) Computer room air conditioning (CRAC) units will serve electronic equipment areas. The CRAC units include chilled water and electric heating coils.

E-3 07/06/2022 JO 6950.27B Appendix E Diagram 1. Simplified Power Distribution System Configuration E-4 07/06/2022 JO 6950.27B Appendix E c. Section 3 – Facility AC Loads Analysis Tabulation 1. Air Traffic Control and Telecommunication Equipment Connected Loads No. Equipment No. Location Room No. kVA Voltage 1 ETVS Cabinet 1 Level 1 Electronic Equipment Rm 1.5 120V-1PH 2 ETVS Cabinet 2 Level 1 Electronic Equipment Rm 1.5 120V-1PH 3 VIDS Cabinet Level 1 Electronic Equipment Rm 1.5 120V-1PH 4 STARS Cabinet Level 1 Electronic Equipment Rm 1.5 120V-1PH 5 DALR Cabinent Level 1 Electronic Equipment Rm 1.5 120V-1PH 6 Swing/Expansion Cabinet Level 1 Electronic Equipment Rm 1.5 120V-1PH 7 Telco Equipment Cabinets Level 1 Telco Room 4.0 120V-1PH 8 ASOS Cabinet ATCT Level 4 ATCT Electronic Equipment Rm 1.5 120V-1PH 9 Comm/Radio Cabinet 1 ATCT Level 5 ATCT Electronic Equipment Rm 1.5 120V-1PH 10 Comm/Radio Cabinet 2 ATCT Level 6 ATCT Electronic Equipment Rm 1.5 120V-1PH 11 Comm/Radio Cabinet 3 ATCT Level 7 ATCT Electronic Equipment Rm 1.5 120V-1PH 12 Swing/Expansion Cabinet ATCT Level 8 ATCT Electronic Equipment Rm 1.5 120V-1PH 13 ATCT Cab Supervisor Position ATCT Cab - 2.0 120V-1PH 14 ATCT Cab Controller Position 1 ATCT Cab - 2.0 120V-1PH 15 ATCT Cab Controller Position 2 ATCT Cab - 2.0 120V-1PH 16 ATCT Cab Controller Position 3 ATCT Cab - 2.0 120V-1PH 17 ATCT Cab Controller Position 4 ATCT Cab - 2.0 120V-1PH Sub Total: 30.5 Tabulation 2. Fire Life Safety Equipment Connected Loads ATS-FLS Connected Loads Area Load Unit Load No. Room Space Types: Sq-Ft Type VA/Sq-Ft HP FLA Factor kVA Voltage 1 Fire Life Safety Systems 7142 Egress Ltg 0.25 1.00 1.8 120V-1PH Security/Fire Alarm 0.50 1.00 3.6 120V-1PH Stair Pressurization - 2.00 7.50 1.00 2.7 208V-3PH Sub Total: 8.1 ATS-ELEV Connected Loads Area Load Unit Load No. Room Space Types: Sq-Ft Type VA/Sq-Ft HP FLA Factor kVA Voltage 1 Elevator Machine Rm - ATCT Fire Service Elevator - 75.00 211.00 1.00 76.0 208V-3PH Sub Total: 76.0 E-5 07/06/2022 JO 6950.27B Appendix E Tabulation 3. Essential Mechanical Equipment Connected Loads Mechanical Computer Room A/C Units No. Equipment No. Location Room No. HP FLA kVA Voltage Remarks 1 CRAH-1 Level 1 Electronic Eq Rm 44.8 16.1 208V-3PH 2 CRAH-2 Level 1 Electronic Eq Rm 44.8 16.1 208V-3PH Redundant Unit 3 CRAH-3 Level 1 Telco Room 30 6.2 208V-1PH 4 CRAH-4 Level 1 Telco Room 30 6.2 208V-1PH Redundant Unit Sub Total: 22.4 Load Factor (x 0.80): 17.9 Mechanical Air Handling Units with Electric Heat No. Equipment No. Location Room No. HP FLA kVA Voltage Remarks 1 AHU-1 ATCT Cab - 4 50 10.4 208V-3PH 2 AHU-2 ATCT Cab - 4 50 10.4 208V-3PH Redundant Unit 3 AHU-3 ATCT Level 4 ATCT Electronic Eq Rm 1.5 19 4.0 208V-3PH 4 AHU-4 ATCT Level 4 ATCT Electronic Eq Rm 1.5 19 4.0 208V-3PH Redundant Unit 5 DOAS-1 Level 1 Mechanical Room 1.5 34 7.1 208V-3PH Sub Total: 21.4 Load Factor (x 0.80): 17.1 Mechanical Air Cooled Chiller No. Equipment No. Location Room No. HP FLA kVA Voltage Remarks 1 CH-1 Building Exterior - 96.7 34.8 208V-3PH 2 CH-2 Building Exterior - 96.7 34.8 208V-3PH Redundant Unit Sub Total: 34.8 Load Factor (x 1.0): 34.8 Mechanical Electric Humidifier Units No. Equipment No. Location Room No. HP FLA kVA Voltage Remarks 1 H-1 ATCT Level 2 Mechanical Room 18.0 6.5 208V-3PH 2 H-2 ATCT Level 2 Mechanical Room 18.0 6.5 208V-3PH Redundant Unit Sub Total: 6.5 Load Factor (x 0.75): 4.9 Mechanical Pumps No. Equipment No. Location Room No. HP FLA kVA Voltage Remarks 1 CHWP-1, Chilled Wtr Pmp Level 1 Mechanical Room 5.0 16.7 6.0 208V-3PH 2 CHWP-2, Chilled Wtr Pmp Level 1 Mechanical Room 5.0 16.7 6.0 208V-3PH 3 CHWP-3, Chilled Wtr Pmp Level 2 Mechanical Room 5.0 16.7 6.0 208V-3PH Redundant Unit 4 CHWP-3, Chilled Wtr Pmp Level 3 Mechanical Room 5.0 16.7 6.0 208V-3PH Redundant Unit 5 Site Sanitary Pump Station Building Exterior - 7.5 24.2 8.7 208V-3PH Sub Total: 20.8 Load Factor (x 0.75): 15.6 System Total Connected Load (CL): 105.9 Est. System Max. Demand Load (DL): 90.3 Est. System Demand Factor (DL/CL): 0.85 E-6 07/06/2022 JO 6950.27B Appendix E Tabulation 4. Non-essential Mechanical Equipment Connected Loads Mechanical Exhaust Fans No. Equipment No. Location Room No. HP FLA kVA Voltage Remarks 1 EF-1 Level 1 Mechanical Room 0.25 5.8 0.7 120V-1PH 2 EF-2 Level 1 Sprinkler Room 0.25 5.8 0.7 120V-1PH 3 EF-3 Level 1 Electrical Room 0.25 5.8 0.7 120V-1PH 4 EF-4 Level 1 Restroom 0.25 5.8 0.7 120V-1PH 5 EF-5 ATCT Level 2 Mechanical Room 0.25 5.8 0.7 120V-1PH 6 EF-6 ATCT Level 3 Mechanical Room 0.25 5.8 0.7 120V-1PH 7 EF-7 ATCT Level 6 Restroom 0.25 5.8 0.7 120V-1PH 8 EF-8 Level 1 Electronic Eq Rm 0.25 5.8 0.7 120V-1PH 9 EF-9 ATCT Level 4 Electronic Eq Rm 0.25 5.8 0.7 120V-1PH 10 EF-10 ATCT Level 5 Break Room 0.25 5.8 0.7 120V-1PH 11 EF-11 ATCT Cab Roof - 0.5 2.4 0.9 208V-3PH Sub Total: 7.5 Load Factor (x 0.50): 3.8 Mechanical Fan Coil Units No. Equipment No. Location Room No. HP FLA kVA Voltage Remarks 1 FC-1 Level 1 Fire Control Room 12.4 2.6 208V-1PH 2 FC-2 Level 1 Corridor 12.4 2.6 208V-1PH 3 FC-3 Level 1 Elevator Machine Rm 12.4 2.6 208V-1PH 4 FC-4 ATCT Level 5 Break Room 12.4 2.6 208V-1PH 5 FC-5 ATCT Level 6 Hall 12.4 2.6 208V-1PH Sub Total: 12.8 Load Factor (x 0.60): 7.7 Mechanical Electric Unit Heaters No. Equipment No. Location Room No. HP FLA kVA Voltage Remarks 1 CUH-1 Level 1 Stairs 8 1.7 208V-3PH 2 CUH-2 Level 1 Restroom 12.5 2.6 208V-3PH 3 CUH-3 Level 1 Vestibule 12.5 2.6 208V-3PH 4 CUH-4 ATCT Level 6 Restroom 12.5 2.6 208V-3PH 5 UH-1 Level 1 Mechanical Room 27 5.6 208V-3PH 6 UH-2 Level 1 Sprinkler Riser Room 27 5.6 208V-3PH 7 UH-3 Level 1 Electrical Room 27 5.6 208V-3PH 8 UH-4 ATCT Level 2 Mechnical Room 27 5.6 208V-3PH 9 UH-5 ATCT Level 3 Mechanical Room 27 5.6 208V-3PH Sub Total: 37.5 Load Factor (x 0.7): 26.3 System Total Connected Load (CL): 57.9 Est. System Max. Demand Load (DL): 37.8 0.65 Est. System Demand Factor (DL/CL): E-7 07/06/2022 JO 6950.27B Appendix E d. Section 4 – Power Source Equipment Load Analysis Diagram 2. Elemental Power System Connection Diagram Tabulation 5. Facility UPS - Load Capacity Facility UPS Power Loads (Estimate) Line Load Type Description Voltage Load Load Factor Sub Total Item No. kVA kVA 1 Level 1 Electronic Equipment Room 208V-3PH 9.00 0.8 7.2 2 Level 1 Telco Equipment Room 208V-3PH 4.00 0.8 3.2 2 ATCT Level 4 Electronic Equipment Rm 208V-3PH 7.50 0.8 6.0 3 ATCT Cab Electronic Equipment 208V-3PH 10.00 0.6 6.0 Subtotal: 22.4 Growth Provision (20%): 4.5 Total: 26.9 Mininum UPS size selection: 30 kVA E-8 07/06/2022 JO 6950.27B Appendix E Tabulation 6. Commercial Utility Electric Service Entrance - Load Capacity SESH Power Loads (Estimate) Line Distribution Load Type Description Voltage Load Demand Sub Total Item No. Point kVA Factor kVA 1 NDPH Nonessential Lighting and Power 208V-3PH 15.1 0.50 7.5 2 NDPH Nonessential Mechanical Equipment 208V-3PH 57.9 0.65 37.6 3 EDPH Essential Lighting 208V-3PH 5.8 1.00 5.8 4 EDPH Mechanical A/C and Ventilation Equipment 208V-3PH 105.9 0.77 81.5 5 EDPH NAS Critical Electronic Equipment 208V-3PH 26.9 1.00 26.9 6 FLSDPH1 Emergency Lighting and Power Equipment 208V-3PH 5.4 1.00 5.4 7 FLSDPH1 ATCT Stair Pressurization Equipment 208V-3PH 2.7 1.00 2.7 8 FLSDPH2 ATCT Fire Service Access Elevator 208V-3PH 76.0 1.00 76.0 Subtotal: 243.5 Growth Provision (15%): 36.5 Total: 280.0 Est. Electric Service Entrance Capacity: 300 kVA Tabulation 7. Power Generation Equipment - Load Capacity Generator Power Loads (Estimate) Line Distribution Load Type Description Voltage Load Demand Sub Total Item No. Point kVA Factor kVA 1 EDPH Essential Lighting 208V-3PH 5.8 1.00 5.8 2 EDPH Mechanical A/C and Ventilation Equipment 208V-3PH 105.9 0.77 81.5 3 EDPH NAS Critical Electronic Equipment 208V-3PH 26.9 1.00 26.9 4 FLSDPH1 Emergency Lighting and Power Equipment 208V-3PH 5.4 1.00 5.4 5 FLSDPH1 ATCT Stair Pressurization Equipment 208V-3PH 2.7 1.00 2.7 6 FLSDPH2 ATCT Fire Service Access Elevator 208V-3PH 76.0 1.00 76.0 Subtotal: 198.3 Growth Provision (10%): 19.8 Total: 218.1 Est. E/G size selection: 180 kW / 225 kVA Note: The generator capacity tabulation is a generic estimate and does not consider other application and environmental criteria associated with generator sizing. The power load capacity and system design must be validated by using the generator manufacturer’s proprietary sizing and load calculation software application tools.

e. Section 5 – Conclusion . This report provides basis of design criteria for development of the electrical power distribution system. This information will be used for follow-on design phases and power study report submissions.

E-9 07/06/2022 JO 6950.27B Appendix E The findings include: (1) Power distribution system will be based on a simple radial topology with following distribution branches: (a) Normal power bus (b) Essential power bus (c) Standby generator power bus (d) Fire life safety power bus (e) Critical power bus.

(2) Preliminary load estimates are based on a combination of individual and area based connected load calculation method for determination of system demand load requirements.

(3) System distribution branch demand load calculations include growth provision of 15% spare capacity.

(4) Power source equipment sizing includes following spare capacity provisions: (a) Service Entrance Equipment: 15% spare capacity (b) Generator Equipment: 10% spare capacity (c) UPS Equipment: 20% spare capacity.

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Appendix F

Appendix F. Power Study Report – Illustrative Example

1. Overview . This section provides guidance material for the preparation of a power study

report and it is intended to illustrate means, but not necessarily the only means, of complying with requirements in this document.

2. Objectives . The project type definition will establish the type and extent of study required.

This section is tailored to suite a new design project with an initial design submission and follow-on design submissions extending to the final design and construction phases.

The power study report includes the following parts:

a. Power load-flow analysis

b. Short-circuit analysis

c. Protective device coordination analysis

d. Arc-flash risk assessment.

The studies may be tailored to suite other project definition types in accordance with Chapter 2 requirements.

3. Purpose . The illustrative examples provide criteria and methods to prepare a report. The project scope definition must be determined during initial project planning process to ensure the

proper application of requirements. The report format must be in accordance with Chapter 2

deliverable and archival storage requirements.

4. Power Study Report – General . A load analysis must be conducted to establish the basic

electrical characteristics of the power distribution system. An example load analysis report is contained in Appendix E.

The power study includes following analyses:

a. Load-flow

b. Short-circuit

c. Protective Device Coordination

d. Arc Flash Risk Assessment.

This section also outlines standard forms that shall be used to present the input data, the output results, and a template to formally document the basis, conclusions and recommendations for each study.

To meet study input requirements, a composite one-line diagram for the power distribution

system is required to serve as a basis for preparation of calculations and analysis. Specific components to be addressed are as follows: a. Maximum and minimum short circuit current availability from the electric utility system.

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Appendix F

b. Transformer ratings and typical or specified impedances. When available and for final

calculations, nameplate data shall be used.

c. Distribution equipment power bus and circuit breaker ratings.

d. System conductor type, size, lengths.

e. Motor loads: model motors 50 HP or larger as a separate input load. Motor loads less

than 50 HP may be grouped as a lump sum horsepower or kw input load.

f. Type and current rating of the protective devices, relays, etc., and their associated

instrument transformers are required for Protective Device and Arc Flash studies.

5. Power Study Implementation Process .

a. Perform data collection process to define model input and power source data.

(1) From the Utility, obtain minimum and maximum values for 3-phase faults and phase

to ground (earth) faults including R/X or X/R ratio: For Preliminary design projects, where

utility information is unavailable, engineering judgement must be used to determine the

minimum and maximum values of 3-phase fault current.

(2) Determine or obtain the method of grounding (earthing).

(3) Gather relevant measured data and test reports.

(4) Gather actual or typical vendor information.

(5) Gather applicable standards and literature information.

(6) Document assumptions.

b. Building the Electrical Analysis Program Calculation Model .

(1) In developing the electronic model, the level of detail will be determined by the

phase of the project and the studies required for that phase per the approved scope of work. In defining the scope of work, the following should be addressed:

(a) The scenario’s to be considered, such as utility, generator, maintenance, and tie-

circuit power flow operating modes.

(b) The number of calculations runs for each scenario, such as at maximum

available short circuit, at minimum available or other values.

(c) The level of detail for the model.

(d) The selection of motors/loads to be modeled individually.

(e) The equipment and voltage levels where arc flash studies are required.

(2) The model comprises busses and branches. Provide a logical bus/branch naming

convention and use a unique designation name for each bus/branch. A logical numbering system

makes the model easily to check and increases readability: Where the design or existing

distribution system includes a standard naming convention, use actual equipment tags for all modelled equipment.

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Appendix F

c. Validate the Calculation Model: (1) Once the model has been built, it should be thoroughly checked for accuracy.

Validate model calculations by performing preliminary calculations to find errors, such as, abnormal high or low short circuit currents, abnormal power flows, and voltages, etc.

(2) After validation, configure the model operating scenarios and ensure that data

changes are incorporated consistently for each scenario.

d. Perform the Load Flow Study .

(1) The Load Flow Study will determine system capability to supply the connected load

under steady-state operating conditions, motor starting inrush transient voltage condition, and normal running conditions for other loads.

(2) The load flow analysis results are used to verify: (a) Bus voltage levels, amperes, and power factor parameters.

(b) Potential extent of overloading transformers, generators, cables, equipment

continuous bus bar ratings, and tie circuits during alternate power operating modes. Generator ratings shall be reviewed at maximum ambient conditions.

(c) Optimum tap setting for power transformers.

(3) Perform load flow runs for system operating scenarios to confirm equipment ratings.

e. Perform the Short Circuit Study .

(1) The Short circuit study will determine the presently available fault current at

strategically designated points and determine if distribution equipment is applied correctly.

(2) The maximum and minimum short circuit currents shall be calculated for each

scenario. The thermal withstand current shall be calculated for each switchboard and shall be used to determine the short circuit ratings of the switchboard.

(3) For the maximum short circuit current scenario, as a minimum calculate the

following:

(a) 3-Phase short circuit currents

(b) Phase-to-Ground short circuit currents

(4) For the minimum short circuit current scenario, as a minimum calculate the

following:

(a) 2-Phase (Line-to-Line) short circuit currents

(b) Phase-to-Ground short circuit currents

(5) Consider negative tolerances on generator and transformer impedances, and positive

tolerances on motor starting currents, as applicable.

(6) All results shall be clearly documented and presented in a report. To help understand

the future available margin for short-circuit capacity, it is recommended that calculated short circuit results be summarized in a table including applicable equipment rated short circuit values.

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Appendix F

f. Perform the Protective Device Coordination Study .

(1) The Protective Device Coordination (PDC) Study will determine appropriate

selection and setting of protective devices required to ensure reliable on-line performance and optimum trip sequencing. Time-current curves will be issued along with the relay setting records.

The parts of the study include: (a) Selection/Definition of current transformers and voltage transformers.

(b) Selection of protection devices to be applied.

(c) Determine protection device settings.

(d) Documentation of results.

(2) A PDC Study starts at the definition of the power system and ends when all relevant

data is known (vendor equipment data). Before a PDC study can be started, the operating

conditions must be known.

(3) The PDC Study shall consider:

(a) Reliability: The ability of the protection to operate correctly. Not only the

correct operation on the occurrence of a fault but also the avoidance of incorrect operation during faults.

(b) Speed: The minimum amount of time to clear a fault to minimize

impact/damage to the power system.

(c) Selectivity: Maintaining continuity of supply by disconnecting the minimum

section of a network necessary to isolate a fault.

(4) Develop the Protection Philosophy for the system. Provide a protection scheme one-

line diagram where required to illustrate levels of device selectivity for the different power load flow scenario configurations.

g. Perform the Arc Flash Analysis .

(1) The objective of an arc flash analysis is to minimize or mitigate the hazard to

electrical service personnel. Consequently, an arc flash hazard analysis must identify following parameters:

(a) System bus bolted fault currents

(b) Equipment enclosure size and bus gaps based upon system voltage and type

classification

(c) Equipment electrode configuration

(d) Working distances

(e) Arcing current

(f) Arc duration

(g) Incident energy

(h) Equipment arc-flash boundary.

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Appendix F

(2) To perform the arc flash analysis, first perform a short circuit study and protective

device coordination study. These studies will provide the short circuit fault current levels and protective device (circuit breaker, fuse, protective relay) settings for the switchgear, motor control centers, panelboards, etc. Access the results of these studies.

(3) Using the results of the short circuit study and protective device coordination study, perform the arc flash incident energy analysis. The arc flash incident energy analysis will identify the following:

(a) Amount of incident energy (cal/cm2) at working distance

(b) Arc Flash hazard boundary

(c) Shock hazard parameters

(d) Limited approach boundary

(e) Restricted approach boundary

(f) Type and level of Personnel Protective Equipment (PPE) needed.

(4) Generate the Arc Flash Warning Labels.

h. Documentation of Results . The results of each study shall be clearly documented and

presented in the report. The report may be an individual report of each study type, or a composite report with a section for each study type. For composite reports, the preferred grouping is Load Flow, Short Circuit, Protective Device Coordination and Arc Flash studies together in a separate report. Other reports such as Load Analysis, Harmonic Studies and Transient Analysis should be separate reports.

6. Power Study Report – Format Example . The report, at a minimum, should contain the

following applicable parts breakdown.

a. Section 1 – Executive Summary . Provide a brief introduction and summary of key

points. Include objectives and purpose of the report, and describe any results, conclusions, or recommendations from the report.

b. Section 2 – Technical Considerations . Provide a narrative description of the following

parts: (1) Study Scope and Objectives: (a) Study Criteria:

(i) Computer software and version information

(ii) Applicable FAA Orders and Standards

(iii) Applicable Building Codes and Industry Standards

(iv) Technical Basis and Assumptions.

c. Section 3 – Analysis and Methodology . Provide narrative description and applicable

diagrams or tables for following items: (1) Power Distribution System Configuration:

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Appendix F

(a) Power One-line Diagram

(b) Power System Operating Modes.

(2) Input Data for Calculation Model:

(a) Utility Data

(b) Generator Data

(c) Motor Data

(d) Transformer Data

(e) Connected Power Loads.

(3) Load-flow and Voltage Drop Analysis

(4) Short-circuit Analysis

(5) Protective Device Coordination Analysis

(6) Arc-Flash Risk Assessment.

d. Section 4 – Summary of Calculation Results . Provide narrative description of results

for following items: (1) Load Analysis Operating Modes:

(a) Load-flow

(b) Voltage Drop.

(2) Short-circuit Operating Modes:

(a) AC Short-circuit

(b) DC Short-circuit.

(3) Protective Device Coordination:

(a) Utility Power Mode

(b) Generator Power Mode

(c) Maintenance/Tie Circuit Power Modes.

(4) Arc-flash Risk Assessment:

(a) AC Arc-flash Hazard

(b) DC Arc-flash Hazard.

e. Section 5 – Appendices . Provide calculation model results and output reports, generated by the software, for the following items: (1) Data Group 1. Computer Software Input Data Output Reports:

(a) Power Bus Data

(b) Conductor/Cable Data

(c) Protective Device Data

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Appendix F

(d) Utility/Generator Data

(e) Transformer Data

(f) Motor Data.

(2) Data Group 2. Load-flow Reports:

(a) Computer software generated and annotated power diagram

(b) Load-flow and voltage drop reports for operating modes.

(3) Data Group 3. Short-circuit Reports:

(a) Computer software generated and annotated power diagram

(b) Short-circuit reports for operating modes

(c) Equipment bus evaluation report

(d) Protective device evaluation report.

(4) Data Group 4. PDCA Reports:

(a) TCC plots

(b) Protective device settings report.

(5) Data Group 5. AFRA Reports:

(a) Arc-flash analysis data report

(b) Arc-flash warning label sample format.

7. Power Study Report Appendices – Illustrative Results Example . This section contains

example results for a generic power study report. The report uses the basic power system

configuration from Appendix E, Load Analysis report example.

The illustrative results are organized by following data groups: a. Data Group 1: Computer software model input/output data reports.

b. Data Group 2: Load-flow calculation results.

c. Data Group 3: Short-circuit calculation results.

d. Data Group 4: Protective device coordination analysis TCC plots and protective device

settings report.

e. Data Group 5: Arc-flash risk assessment results tabulation, equipment enclosure size and electrode configuration table, and arc-flash hazard warning label sample format.

Note: This example should not be read as a template or used as a form to fill in. The user is

responsible for the final content and report format. The example calculations provided are

intentionally over-simplified to clarify the process involved and illustrate the results. They do not provide definitive numbers or values and are for guidance only.

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Appendix F

Data Group 1. Calculation Model - Bus Data

System Parameters Bus Data

Line # Component Field Parameter Base Project

1 CPL1 System Nominal Voltage (V) 208

2 Equipment Category LV Panelboard

3 Manufacturer SQUARE D

4 Bus Lib Type NQOD CLASS 1630

5 Description 225A

6 Rating Description 225A 240V 225.0A 10.0kA 1.732

7 EDPH System Nominal Voltage (V) 208

8 Equipment Category LV Panelboard

9 Manufacturer SQUARE D

10 Bus Lib Type I - LINE CLASS 2110

11 Description 800A

12 Rating Description 800A 240V 800.0A 25.0kA 4.899

13 EPH1 System Nominal Voltage (V) 208

14 Equipment Category LV Panelboard

15 Manufacturer SQUARE D

16 Bus Lib Type NQOD CLASS 1630

17 Description 225A

18 Rating Description 225A 240V 225.0A 10.0kA 1.732

19 EPH2 System Nominal Voltage (V) 208

20 Equipment Category LV Panelboard

21 Manufacturer SQUARE D

22 Bus Lib Type NQOD CLASS 1630

23 Description 225A

24 Rating Description 225A 240V 225.0A 10.0kA 1.732

25 FLS - ELEV System Nominal Voltage (V) 208

26 Equipment Category LV Panelboard

27 Manufacturer SQUARE D

28 Bus Lib Type I - LINE CLASS 2110

29 Description 400A

30 Rating Description 400A 240V 400.0A 25.0kA 4.899

31 FLSDPH1 System Nominal Voltage (V) 208

32 Equipment Category LV Panelboard

33 Manufacturer SQUARE D

34 Bus Lib Type NQOD CLASS 1630

35 Description 225A

36 Rating Description 225A 240V 225.0A 10.0kA 1.732

37 GDPH System Nominal Voltage (V) 208

38 Equipment Category LV Panelboard

39 Manufacturer SQUARE D

40 Bus Lib Type I - LINE CLASS 2110

41 Description 800A

42 Rating Description 800A 240V 800.0A 25.0kA 4.899

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Appendix F

Data Group 1. Calculation Model - Bus Data (continued)

System Parameters Bus Data

Line # Component Field Parameter Base Project

43 NDPH System Nominal Voltage (V) 208

44 Equipment Category LV Panelboard

45 Manufacturer SQUARE D

46 Bus Lib Type I - LINE CLASS 2110

47 Description 400A

48 Rating Description 400A 240V 400.0A 25.0kA 4.899

49 NPH System Nominal Voltage (V) 208

50 Equipment Category LV Panelboard

51 Manufacturer SQUARE D

52 Bus Lib Type NQOD CLASS 1630

53 Description 225A

54 Rating Description 225A 240V 225.0A 10.0kA 1.732

55 SEDPH System Nominal Voltage (V) 208

56 Equipment Category LV Switchboard

57 Manufacturer SQUARE D

58 Bus Lib Type SPEED - D CLASS 2710

59 Description 1200A

60 Rating Description 1200A 240V 1200.0A 25.0kA 4.899

61 SESH System Nominal Voltage (V) 208

62 Equipment Category LV Switchboard

63 Manufacturer SQUARE D

64 Bus Lib Type SPEED - D CLASS 2710

65 Description 1200A

66 Rating Description 1200A 240V 1200.0A 25.0kA 4.899

67 UPS - MBP System Nominal Voltage (V) 208

68 Equipment Category LV Panelboard

69 Manufacturer SQUARE D

70 Bus Lib Type I - LINE CLASS 2110

71 Description 225A

72 Rating Description 225A 240V 225.0A 25.0kA 4.899

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Appendix F

Data Group 1. Calculation Model - Cable Data

System Parameters Cable Data

Line # Component Field Parameter Base Project

1 ATS - ELEV - F ComponentName ATS - ELEV - F

2 ConnectedBus SEDPH

3 ConductorType Copper

4 Conductor Desc 3 - (1/C)

5 CableSize (AWG) 4/0

6 QtyPerPhase 2

7 Length (ft) 50

8 ATS - ELEV - GM - F ComponentName ATS - ELEV - GM - F

9 ConnectedBus GDPH

10 ConductorType Copper

11 Conductor Desc 3 - (1/C)

12 CableSize (AWG) 4/0

13 QtyPerPhase 2

14 Length (ft) 50

15 ATS - F ComponentName ATS - F

16 ConnectedBus SEDPH

17 ConductorType Copper

18 Conductor Desc 3 - (1/C)

19 CableSize (kcmil) 350

20 QtyPerPhase 2

21 Length (ft) 25

22 ATS - FLS - F ComponentName ATS - FLS - F

23 ConnectedBus SEDPH

24 ConductorType Copper

25 Conductor Desc 3 - (1/C)

26 CableSize (AWG) 1/0

27 QtyPerPhase 1

28 Length (ft) 50

29 ATS - FLS - GM - F ComponentName ATS - FLS - GM - F

30 ConnectedBus GDPH

31 ConductorType Copper

32 Conductor Desc 3 - (1/C)

33 CableSize (AWG) 1/0

34 QtyPerPhase 1

35 Length (ft) 50

36 ATS - GM - F ComponentName ATS - GM - F

37 ConnectedBus GDPH

38 ConductorType Copper

39 Conductor Desc 3 - (1/C)

40 CableSize (kcmil) 350

41 QtyPerPhase 2

42 Length (ft) 25

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Appendix F

Data Group 1. Calculation Model - Cable Data (continued)

System Parameters Cable Data

Line # Component Field Parameter Base Project

43 CH1 - F ComponentName CH1 - F

44 ConnectedBus EDPH

45 ConductorType Copper

46 Conductor Desc 3 - (1/C)

47 CableSize (AWG) 1/0

48 QtyPerPhase 1

49 Length (ft) 100

50 CH1 - MTR - F ComponentName CH1 - MTR - F

51 ConnectedBus BUS - 0041

52 ConductorType Copper

53 Conductor Desc 3 - (1/C)

54 CableSize (AWG) 1/0

55 QtyPerPhase 1

56 Length (ft) 10

57 CH2 - F ComponentName CH2 - F

58 ConnectedBus EDPH

59 ConductorType Copper

60 Conductor Desc 3 - (1/C)

61 CableSize (AWG) 1/0

62 QtyPerPhase 1

63 Length (ft) 100

64 CH2 - MTR - F ComponentName CH2 - MTR - F

65 ConnectedBus BUS - 0044

66 ConductorType Copper

67 Conductor Desc 3 - (1/C)

68 CableSize (AWG) 1/0

69 QtyPerPhase 1

70 Length (ft) 10

71 CPL1 - F ComponentName CPL1 - F

72 ConnectedBus UPS - MBP

73 ConductorType Copper

74 Conductor Desc 3 - (1/C)

75 CableSize (AWG) 1/0

76 QtyPerPhase 1

77 Length (ft) 75

78 EDPH - F ComponentName EDPH - F

79 ConnectedBus BUS - 0028

80 ConductorType Copper

81 Conductor Desc 3 - (1/C)

82 CableSize (kcmil) 350

83 QtyPerPhase 2

84 Length (ft) 50

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Appendix F

Data Group 1. Calculation Model - Cable Data (continued)

System Parameters Cable Data

Line # Component Field Parameter Base Project

85 ELEV - F ComponentName ELEV - F

86 ConnectedBus FLS - ELEV

87 ConductorType Copper

88 Conductor Desc 3 - (1/C)

89 CableSize (AWG) 1/0

90 QtyPerPhase 2

91 Length (ft) 75

92 ELEV - MTR - F ComponentName ELEV - MTR - F

93 ConnectedBus BUS - 0036

94 ConductorType Copper

95 Conductor Desc 3 - (1/C)

96 CableSize (AWG) 1/0

97 QtyPerPhase 2

98 Length (ft) 15

99 EPH1 - F ComponentName EPH1 - F

100 ConnectedBus EDPH

101 ConductorType Copper

102 Conductor Desc 3 - (1/C)

103 CableSize (AWG) 1/0

104 QtyPerPhase 1

105 Length (ft) 75

106 EPH2 - F ComponentName EPH2 - F

107 ConnectedBus EDPH

108 ConductorType Copper

109 Conductor Desc 3 - (1/C)

110 CableSize (AWG) 1/0

111 QtyPerPhase 1

112 Length (ft) 75

113 FLSDPH1 - F ComponentName FLSDPH1 - F

114 ConnectedBus BUS - 0031

115 ConductorType Copper

116 Conductor Desc 3 - (1/C)

117 CableSize (AWG) 1/0

118 QtyPerPhase 1

119 Length (ft) 25

120 FLSDPH2 - F ComponentName FLSDPH2 - F

121 ConnectedBus BUS - 0033

122 ConductorType Copper

123 Conductor Desc 3 - (1/C)

124 CableSize (AWG) 4/0

125 QtyPerPhase 2

126 Length (ft) 75

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Appendix F

Data Group 1. Calculation Model - Cable Data (continued)

System Parameters Cable Data

Line # Component Field Parameter Base Project

127 GDPH - F ComponentName GDPH - F

128 ConnectedBus BUS - 0016

129 ConductorType Copper

130 Conductor Desc 3 - (1/C)

131 CableSize (kcmil) 600

132 QtyPerPhase 2

133 Length (ft) 75

134 NDPH - F ComponentName NDPH - F

135 ConnectedBus SEDPH

136 ConductorType Copper

137 Conductor Desc 3 - (1/C)

138 CableSize (kcmil) 250

139 QtyPerPhase 1

140 Length (ft) 25

141 NPH - F ComponentName NPH - F

142 ConnectedBus NDPH

143 ConductorType Copper

144 Conductor Desc 3 - (1/C)

145 CableSize (AWG) 1/0

146 QtyPerPhase 1

147 Length (ft) 75

148 SEDPH - F ComponentName SEDPH - F

149 ConnectedBus SESH

150 ConductorType Copper

151 Conductor Desc 3 - (1/C)

152 CableSize (kcmil) 600

153 QtyPerPhase 3

154 Length (ft) 25

155 SESH - F ComponentName SESH - F

156 ConnectedBus BUS - 0012

157 ConductorType Copper

158 Conductor Desc 3 - (1/C)

159 CableSize (kcmil) 600

160 QtyPerPhase 3

161 Length (ft) 125

162 UPS - MBP - F ComponentName UPS - MBP - F

163 ConnectedBus BUS - 0039

164 ConductorType Copper

165 Conductor Desc 3 - (1/C)

166 CableSize (AWG) 1/0

167 QtyPerPhase 1

168 Length (ft) 50

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Appendix F

Data Group 1. Calculation Model - Cable Data (continued)

System Parameters Cable Data

Line # Component Field Parameter Base Project

169 UPS - MBP - MMB - F ComponentName UPS - MBP - MMB - F

170 ConnectedBus EDPH

171 ConductorType Copper

172 Conductor Desc 3 - (1/C)

173 CableSize (AWG) 1/0

174 QtyPerPhase 1

175 Length (ft) 50

176 UPS - RIB - F ComponentName UPS - RIB - F

177 ConnectedBus EDPH

178 ConductorType Copper

179 Conductor Desc 3 - (1/C)

180 CableSize (AWG) 1/0

181 QtyPerPhase 1

182 Length (ft) 50

183 UTIL - F ComponentName UTIL - F

184 ConnectedBus UTILITY BUS

185 ConductorType Copper

186 Conductor Desc 3 - 1/C

187 CableSize (AWG) 2

188 QtyPerPhase 1

189 Length (ft) 100

Data Group 2. Calculation Model - Motor Data

System Parameters Motor Data

Line # Component Field Parameter Base Project

1 CH1 - MTR ComponentName CH1 - MTR

2 ConnectedBus BUS - 0042

4 Energize State In

5 System Nominal Voltage (V) 208

6 BaseVoltage (V) 208

7 Base kVA (kVA) 28.5

8 X"d (pu) 0.150738

9 X/R 4.899

10 CH2 - MTR ComponentName CH2 - MTR

11 ConnectedBus BUS - 0045

13 Energize State In

14 System Nominal Voltage (V) 208

15 BaseVoltage (V) 208

16 Base kVA (kVA) 28.5

17 X"d (pu) 0.150738

18 X/R 4.899

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Appendix F

Data Group 2. Calculation Model - Motor Data (continued)

System Parameters Motor Data

Line # Component Field Parameter Base Project

19 ELEV - MTR ComponentName ELEV - MTR

20 ConnectedBus BUS - 0037

22 Energize State In

23 System Nominal Voltage (V) 208

24 BaseVoltage (V) 208

25 Base kVA (kVA) 75.2

26 X"d (pu) 0.150738

27 X/R 4.899

28 EPH2 - MTR ComponentName EPH2 - MTR

29 ConnectedBus EPH2

31 Energize State In

32 System Nominal Voltage (V) 208

33 BaseVoltage (V) 208

34 Base kVA (kVA) 35

35 X"d (pu) 0.150738

36 X/R 4.899

37 Exhaust Fans ComponentName Exhaust Fans

38 ConnectedBus NDPH

40 Energize State Out

41 System Nominal Voltage (V) 208

42 BaseVoltage (V) 208

43 Base kVA (kVA) 12.8

44 X"d (pu) 0.150738

45 X/R 4.899

46 SF - 1 ComponentName SF - 1

47 ConnectedBus FLSDPH1

49 Energize State In

50 System Nominal Voltage (V) 208

51 BaseVoltage (V) 208

52 Base kVA (kVA) 1.9

53 X"d (pu) 0.150738

54 X/R 4.899

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Appendix F

Data Group 1. Calculation Model - Transformer Data

System Parameters Transformer Data

Line # Component Field Parameter Base Project

1 T - UTILITY ComponentName T - UTILITY

2 Manufacturer NONE

3 Type Oil Air/Forced Air

4 Energize State In

5 (kVA) 300

6 FullLoad kVA (kVA) 375

7 Pri Connection Delta

8 Pri FLA (A) 15.7

9 Sec Connection Wye - Ground

10 Sec FLA (A) 1040.9

11 X/R 2.9176

12 Z% (%) 5.2432

13 DamageCurve 3 Phase + SLG

Data Group 1. Calculation Model - Utility Power Source Data

System Parameters Utility Power Source Data

Line # Component Field Parameter Base Project

1 T - UTILITY ComponentName T - UTILITY

2 Manufacturer NONE

3 Type Oil Air/Forced Air

4 Energize State In

5 (kVA) 300.00

6 FullLoad kVA (kVA) 375.00

7 Pri Connection Delta

8 Pri FLA (A) 15.70

9 Sec Connection Wye - Ground

10 Sec FLA (A) 1040.9

11 X/R 2.9176

12 Z% (%) 5.2432

13 DamageCurve 3 Phase + SLG

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Appendix F

Data Group 1. Calculation Model - Generator Data

System Parameters Generator Power Source Data

Line # Component Field Parameter Base Project

1 GEN ComponentName GEN

2 ConnectedComponent1 GEN - IB:1

3 Manufacturer Kohler 180REOZJG, 60Hz

4 System Nominal Voltage (V) 208

5 Rated Volt (V) 208

6 ConnectionType Wye - Ground

7 Rated kVA (kVA) 225

8 Rated kW (kW) 180

9 Rated PF (Lag) 0.8

10 RatedAmps (A) 624.54

11 Poles 4

12 BaseVoltage (V) 208

13 Base kVA (kVA) 225

14 SourceType Volts & Angle (SB)

15 X"d (pu) 0.15

16 X"Neg (pu) 0.15

17 X"Pos (pu) 0.15

18 X"q (pu) 0.15

19 X"Zero (pu) 0.15

20 X/R Neg 13.9695

21 X/R Pos 13.9695

22 X/R Zero 13.9695

23 X0 (pu) 0.15

24 Xd (pu) 2.75

25 X'd (pu) 0.29

26 Xd Saturated (pu) 1.6

27 Xdp Saturated (pu) 0.15

28 Xdpp Saturated (pu) 0.1

29 If 3

30 Tdc (ms) 93

31 Tdp (ms) 420

32 Tdpp (ms) 26

33 R0 (pu) 0.0107

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Appendix F

Data Group 1. Calculation Model - Protective Device Data

System Parameters Protective Device Data

Line # Component Field Parameter Base Project

1 ATS - ELEV - FB ComponentName ATS - ELEV - FB

2 Manufacturer SQUARE D

3 Frame/Model PG

4 Frame/Rating (A) 1200

5 FrameVoltage (V) 240

6 InterruptingRating (kA) 65

7 Poles 3 Poles

8 Sensor/Trip (A) 400

9 TCC No. 613 - 4, 5, 7, 10

10 ATS - ELEV - GM - FB ComponentName ATS - ELEV - GM - FB

11 Manufacturer SQUARE D

12 Frame/Model PG

13 Frame/Rating (A) 1200

14 FrameVoltage (V) 240

15 InterruptingRating (kA) 65

16 Poles 3 Poles

17 Sensor/Trip (A) 400

18 TCC No. 613 - 4, 5, 7, 10

19 ATS - FB ComponentName ATS - FB

20 Manufacturer SQUARE D

21 Frame/Model PG

22 Frame/Rating (A) 1200

23 FrameVoltage (V) 240

24 InterruptingRating (kA) 65

25 Poles 3 Poles

26 Sensor/Trip (A) 800

27 TCC No. 613 - 4, 5, 7, 10

28 ATS - FLS - FB ComponentName ATS - FLS - FB

29 Manufacturer SQUARE D

30 Frame/Model PG

31 Frame/Rating (A) 1200

32 FrameVoltage (V) 240

33 InterruptingRating (kA) 65

34 Poles 3 Poles

35 Sensor/Trip (A) 250

36 TCC No. 613 - 4, 5, 7, 10

37 ATS - FLS - GM - FB ComponentName ATS - FLS - GM - FB

38 Manufacturer SQUARE D

39 Frame/Model PG

40 Frame/Rating (A) 1200

41 FrameVoltage (V) 240

42 InterruptingRating (kA) 65

43 Poles 3 Poles

44 Sensor/Trip (A) 250

45 TCC No. 613 - 4, 5, 7, 10

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Appendix F

Data Group 1. Calculation Model - Protective Device Data (continued)

System Parameters Protective Device Data

Line # Component Field Parameter Base Project

46 ATS - GM - FB ComponentName ATS - GM - FB

47 Manufacturer SQUARE D

48 Frame/Model PG

49 Frame/Rating (A) 1200

50 FrameVoltage (V) 240

51 InterruptingRating (kA) 65

52 Poles 3 Poles

53 Sensor/Trip (A) 800

54 TCC No. 613 - 4, 5, 7, 10

55 CH1 - FB ComponentName CH1 - FB

56 Manufacturer SQUARE D

57 Frame/Model LD

58 Frame/Rating (A) 400

59 FrameVoltage (V) 240

60 InterruptingRating (kA) 25

61 Poles 3 Poles

62 Sensor/Trip (A) 400

63 TCC No. S1A81___00

64 CH2 - FB ComponentName CH2 - FB

65 Manufacturer SQUARE D

66 Frame/Model LD

67 Frame/Rating (A) 400

68 FrameVoltage (V) 240

69 InterruptingRating (kA) 25

70 Poles 3 Poles

71 Sensor/Trip (A) 400

72 TCC No. S1A81___00

73 CPL1 - BB ComponentName CPL1 - BB

74 Manufacturer SQUARE D

75 Frame/Model QO

76 Frame/Rating (A) 50

77 FrameVoltage (V) 240

78 InterruptingRating (kA) 10

79 Poles 1 Pole

80 Sensor/Trip (A) 50

81 TCC No. 730 - 2,3,4,5,6

82 CPL1 - FB ComponentName CPL1 - FB

83 Manufacturer SQUARE D

84 Frame/Model JD

85 Frame/Rating (A) 250

86 FrameVoltage (V) 240

87 InterruptingRating (kA) 25

88 Poles 3 Poles

89 Sensor/Trip (A) 250

90 TCC No. S1A814__00

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Appendix F

Data Group 1. Calculation Model - Protective Device Data (continued)

System Parameters Protective Device Data

Line # Component Field Parameter Base Project

91 CPL1 - MB ComponentName CPL1 - MB

92 Manufacturer SQUARE D

93 Frame/Model JD

94 Frame/Rating (A) 250

95 FrameVoltage (V) 240

96 InterruptingRating (kA) 25

97 Poles 3 Poles

98 Sensor/Trip (A) 250

99 TCC No. S1A814__00

100 EDPH - MB ComponentName EDPH - MB

101 Manufacturer SQUARE D

102 Frame/Model PG

103 Frame/Rating (A) 1200

104 FrameVoltage (V) 240

105 InterruptingRating (kA) 65

106 Poles 3 Poles

107 Sensor/Trip (A) 800

108 TCC No. 613 - 4, 5, 7, 10

109 EPH1 - BB ComponentName EPH1 - BB

110 Manufacturer SQUARE D

111 Frame/Model QO

112 Frame/Rating (A) 20

113 FrameVoltage (V) 240

114 InterruptingRating (kA) 10

115 Poles 1 Pole

116 Sensor/Trip (A) 20

117 TCC No. 730 - 2,3,4,5,6

118 EPH1 - FB ComponentName EPH1 - FB

119 Manufacturer SQUARE D

120 Frame/Model HD

121 Frame/Rating (A) 150

122 FrameVoltage (V) 240

123 InterruptingRating (kA) 25

124 Poles 3 Poles

125 Sensor/Trip (A) 150

126 TCC No. 50 - 1,2,3,4

127 EPH1 - MB ComponentName EPH1 - MB

128 Manufacturer SQUARE D

129 Frame/Model HD

130 Frame/Rating (A) 150

131 FrameVoltage (V) 240

132 InterruptingRating (kA) 25

133 Poles 3 Poles

134 Sensor/Trip (A) 150

135 TCC No. 50 - 1,2,3,4

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Appendix F

Data Group 1. Calculation Model - Protective Device Data (continued)

System Parameters Protective Device Data

Line # Component Field Parameter Base Project

136 EPH2 - BB ComponentName EPH2 - BB

137 Manufacturer SQUARE D

138 Frame/Model QO

139 Frame/Rating (A) 20

140 FrameVoltage (V) 240

141 InterruptingRating (kA) 10

142 Poles 1 Pole

143 Sensor/Trip (A) 20

144 TCC No. 730 - 2,3,4,5,6

145 EPH2 - FB ComponentName EPH2 - FB

146 Manufacturer SQUARE D

147 Frame/Model HD

148 Frame/Rating (A) 150

149 FrameVoltage (V) 240

150 InterruptingRating (kA) 25

151 Poles 3 Poles

152 Sensor/Trip (A) 150

153 TCC No. 50 - 1,2,3,4

154 EPH2 - MB ComponentName EPH2 - MB

155 Manufacturer SQUARE D

156 Frame/Model HD

157 Frame/Rating (A) 150

158 FrameVoltage (V) 240

159 InterruptingRating (kA) 25

160 Poles 3 Poles

161 Sensor/Trip (A) 150

162 TCC No. 50 - 1,2,3,4

163 FLS - ELEV - MB ComponentName FLS - ELEV - MB

164 Manufacturer SQUARE D

165 Frame/Model LD

166 Frame/Rating (A) 400

167 FrameVoltage (V) 240

168 InterruptingRating (kA) 25

169 Poles 3 Poles

170 Sensor/Trip (A) 400

171 TCC No. S1A81___00

172 FLSDPH1 - BB ComponentName FLSDPH1 - BB

173 Manufacturer SQUARE D

174 Frame/Model QO

175 Frame/Rating (A) 20

176 FrameVoltage (V) 240

177 InterruptingRating (kA) 10

178 Poles 1 Pole

179 Sensor/Trip (A) 20

180 TCC No. 730 - 2,3,4,5,6

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Appendix F

Data Group 1. Calculation Model - Protective Device Data (continued)

System Parameters Protective Device Data

Line # Component Field Parameter Base Project

181 FLSDPH1 - MB ComponentName FLSDPH1 - MB

182 Manufacturer SQUARE D

183 Frame/Model HD

184 Frame/Rating (A) 150

185 FrameVoltage (V) 240

186 InterruptingRating (kA) 25

187 Poles 3 Poles

188 Sensor/Trip (A) 150

189 TCC No. S1A814__00

190 GDPH - GB ComponentName GDPH - GB

191 Manufacturer SQUARE D

192 Frame/Model PG

193 Frame/Rating (A) 1200

194 FrameVoltage (V) 240

195 InterruptingRating (kA) 65

196 Poles 3 Poles

197 Sensor/Trip (A) 800

198 TCC No. 613 - 4, 5, 7, 10

199 GEN - IB ComponentName GEN - IB

200 Manufacturer SQUARE D

201 Frame/Model PG

202 Frame/Rating (A) 1200

203 FrameVoltage (V) 240

204 InterruptingRating (kA) 65

205 Poles 3 Poles

206 Sensor/Trip (A) 800

207 TCC No. 613 - 4, 5, 7, 10

208 NDPH - FB ComponentName NDPH - FB

209 Manufacturer SQUARE D

210 Frame/Model PG

211 Frame/Rating (A) 1200

212 FrameVoltage (V) 240

213 InterruptingRating (kA) 65

214 Poles 3 Poles

215 Sensor/Trip (A) 250

216 TCC No. 613 - 4, 5, 7, 10

217 NPH - BB ComponentName NPH - BB

218 Manufacturer SQUARE D

219 Frame/Model QO

220 Frame/Rating (A) 20

221 FrameVoltage (V) 240

222 InterruptingRating (kA) 10

223 Poles 1 Pole

224 Sensor/Trip (A) 20

225 TCC No. 730 - 2,3,4,5,6

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Appendix F

Data Group 1. Calculation Model - Protective Device Data (continued)

System Parameters Protective Device Data

Line # Component Field Parameter Base Project

226 NPH - FB ComponentName NPH - FB

227 Manufacturer SQUARE D

228 Frame/Model HD

229 Frame/Rating (A) 150

230 FrameVoltage (V) 240

231 InterruptingRating (kA) 25

232 Poles 3 Poles

233 Sensor/Trip (A) 150

234 TCC No. 50 - 1,2,3,4

235 NPH - MB ComponentName NPH - MB

236 Manufacturer SQUARE D

237 Frame/Model HD

238 Frame/Rating (A) 150

239 FrameVoltage (V) 240

240 InterruptingRating (kA) 25

241 Poles 3 Poles

242 Sensor/Trip (A) 150

243 TCC No. 50 - 1,2,3,4

262 SESH - MB ComponentName SESH - MB

263 Manufacturer SQUARE D

264 Frame/Model PG

265 Frame/Rating (A) 1200

266 FrameVoltage (V) 240

267 InterruptingRating (kA) 65

268 Poles 3 Poles

269 Sensor/Trip (A) 800

270 TCC No. 613 - 4, 5, 7, 10

271 T - UTIL - F ComponentName T - UTIL - F

272 Manufacturer S&C

273 Frame/Model SM - 4, 15E

274 Frame/Rating (A) 15

275 FrameVoltage (V) 7200

276 InterruptingRating (kA) 15.6

277 Poles 3 Poles

278 Sensor/Trip (A) 15

279 TCC No. 119 - 4, 119 - 4 - 2

280 UPS - MBB ComponentName UPS - MBB

281 Manufacturer SQUARE D

282 Frame/Model LD

283 Frame/Rating (A) 400

284 FrameVoltage (V) 240

285 InterruptingRating (kA) 25

286 Poles 3 Poles

287 Sensor/Trip (A) 400

288 TCC No. S1A816__00

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Appendix F

Data Group 1. Calculation Model - Protective Device Data (continued)

System Parameters Protective Device Data

Line # Component Field Parameter Base Project

289 UPS - MBB - FB ComponentName UPS - MBB - FB

290 Manufacturer SQUARE D

291 Frame/Model LD

292 Frame/Rating (A) 400

293 FrameVoltage (V) 240

294 InterruptingRating (kA) 25

295 Poles 3 Poles

296 Sensor/Trip (A) 400

297 TCC No. S1A816__00

298 UPS - MIB ComponentName UPS - MIB

299 Manufacturer SQUARE D

300 Frame/Model LD

301 Frame/Rating (A) 400

302 FrameVoltage (V) 240

303 InterruptingRating (kA) 25

304 Poles 3 Poles

305 Sensor/Trip (A) 400

306 TCC No. S1A816__00

307 UPS - RIB ComponentName UPS - RIB

308 Manufacturer SQUARE D

309 Frame/Model LD

310 Frame/Rating (A) 400

311 FrameVoltage (V) 240

312 InterruptingRating (kA) 25

313 Poles 3 Poles

314 Sensor/Trip (A) 400

315 TCC No. S1A816__00

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Appendix F

Data Group 2: Load Flow Calculation Utility Power Mode Diagram

Load Flow Calculation

Data Group 2. Diagrams

Utility Power Mode

UTIL-0001 219.6 kW 154.7 kVAR ubLF PQ A: 73.20 kW, 51.56 kVar B: 73.20 kW, 51.56 kVar C: 73.20 kW, 51.56 kVar UTILITY BUS 13800.0 V LF Voltage 13776.73 V UTIL-F LF VD% 0.17 % 219.6 kW LF kW 219.59 kW 154.7 kVAR LF kVAR 154.69 kVAR Percent VD 0.0 % LF PF 0.82 LF 11 A T- UTIL-F P GEN T- U TILITY 0.0 kVAR S 219.6 kW 154.7 kVAR SESH-F 215.5 kW GEN-IB 142.7 kVAR Percent VD 1.0 % LF 711 A SESH 208.0 V LF Voltage 207.71 V LF VD% 0.14 % SESH-MB GDPH-F LF kW 214.03 kW 0.0 kW LF kVAR 140.26 kVAR 0.0 kVAR LF PF 0.84 Percent VD 0.0 % LF 0 A SEDPH-F 214.0 kW 140.3 kVAR Percent VD 0.2 % LF 711 A GDPH-GB SEDH-MB GDPH 208.0 V SEDPH LF Voltage 0.00 V 208.0 V LF VD% 0.00 % LF Voltage 207.22 V LF kW 0.00 kW LF VD% 0.37 % Open ATS-ELEV-GM- FB ATS-F LS-GM-FB ATS-GM- FB EDPH-GMBB-FB LF kVAR 0.00 kVAR LF kW 213.71 kW ATS-F B ATS-F LS-FB ATS-ELEV -F B NDPH-FB LF PF 0.00 LF kVAR 139.65 kVAR LF PF 0.84 ATS-ELEV -GM- F ATS-F LS-GM-F ATS-GM- F 0.0 kW 0.0 kW 0.0 kW 0.0 kVAR 0.0 kVAR 0.0 kVAR ATS-F ATS-F LS-F ATS-ELEV -F NDPH-F Percent VD 0.0 % Percent VD 0.0 % Percent VD 0.0 % 91.4 kW 6.6 kW 61.4 kW 54.3 kW LF 0 A LF 0 A LF 0 A 61.4 kVAR 3.1 kVAR 45.9 kVAR 29.2 kVAR Percent VD 0.2 % Percent VD 0.1 % Percent VD 0.4 % Percent VD 0.3 % LF 307 A LF 20 A LF 214 A LF 172 A A B A B A B EDPH-GMBB-F ATS-F LS ATS-ELEV ATS 0.0 kW 0.0 kVAR Percent VD 0.0 % EDPH-F LF 0 A 91.2 kW 61.3 kVAR Percent VD 0.4 % LF 307 A FLSDPH1-F FLSDPH2-F 6.6 kW 61.2 kW 3.1 kVAR 45.7 kVAR EDPH-MB Open EDPH-MBB Percent VD 0.1 % Percent VD 0.5 % LF 20 A LF 214 A NDPH EDPH 208.0 V 208.0 V LF Voltage 206.69 V LF Voltage 206.02 V LF VD% 0.63 % LF VD% 0.95 % NPH-FB UPS-RIB Open UPS-MBB-FB CH1-FB CH2-FB EPH1-FB EPH2-FB LF kW 54.21 kW LF kW 90.95 kW LF kVAR 29.09 kVAR LF kVAR 60.90 kVAR LF PF 0.88 LF PF 0.83 Exhuast Fans Unit Heaters Fan Coil Units CH1-F CH2-F 12.8 kVA 26.3 kVA 7.7 kVA 24.5 kW 0.0 kW 15.2 kVAR 0.0 kVAR Percent VD 0.9 % Percent VD 0.0 % UPS-RIB-F NPH-F FLSDPH1-MB LF 81 A LF 0 A FLSDPH2-MB 12.0 kW 22.8 kW 9.0 kVAR 17.0 kVAR Percent VD 0.9 % Percent VD 0.3 % FLSDPH1 FLSDPH2 LF 42 A LF 80 A 208.0 V 208.0 V LF Voltage 206.87 V CH1 CH2 LF Voltage 205.35 V LF VD% 0.54 % LF VD% 1.27 % FLS-ELEV-F B LF kW 6.57 kW LF kW 60.90 kW FLSDPH1-BB EPH1-F EPH2-F LF kVAR 3.11 kVAR LF kVAR 45.46 kVAR LF PF 0.90 LF PF 0.80 9.6 kW 34.0 kW UPS 7.2 kVAR 21.5 kVAR Percent VD 0.3 % Percent VD 0.9 % FLS-Load SF-1 LF 34 A LF 113 A 5.4 kVA 2 hp CH1-MTR-F CH2-MTR-F 24.3 kW 0.0 kW UPS-MBP-F UPS-MBP-MMB-F ELEV-F 15.0 kVAR 0.0 kVAR 60.9 kW 22.6 kW 0.0 kW Percent VD 0.1 % Percent VD 0.0 % NPH-MB 45.5 kVAR 16.9 kVAR 0.0 kVAR LF 81 A LF 0 A Percent VD 0.9 % Percent VD 0.4 % Percent VD 0.0 % LF 214 A LF 80 A LF 0 A NPH 208.0 V LF Voltage 205.98 V LF VD% 0.97 % CH1-MTR CH2-MTR Elevator Disconnect LF kW 12.00 kW Open 22.56 kW 22.56 kW LF kVAR 9.00 kVAR UPS-MIB UPS-MBB EPH1-MB EPH2-MB LF PF 0.80 NPH-BB UPS-MBP EPH1 EPH2 NPH-Load ELEV 208.0 V 208.0 V 208.0 V 15 kVA LF Voltage 203.23 V LF Voltage 205.46 V LF Voltage 204.11 V LF VD% 2.29 % LF VD% 1.22 % LF VD% 1.87 % LF kW 22.44 kW LF kW 9.60 kW LF kW 33.67 kW LF kVAR 16.82 kVAR CPL1-FB EPH1-BB LF kVAR 7.20 kVAR EPH2-BB LF kVAR 21.38 kVAR ELEV-MTR- F LF PF 0.80 LF PF 0.80 LF PF 0.84 CPL2-Load 60.3 kW 14 kVA 45.2 kVAR Percent VD 0.2 % EPH1-Load EPH2-Load EPH2-MTR LF 214 A 12 kVA 4.9 kVA 35 kVA CPL1-F 11.2 kW 8.4 kVAR ELEV-MTR Percent VD 0.3 % 75 hp LF 40 A CPL1-MB CPL1 208.0 V LF Voltage 202.56 V LF VD% 2.62 % LF kW 11.20 kW LF kVAR 8.40 kVAR CPL1-Load CPL1-BB LF PF 0.80 14 kVA

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Appendix F

Data Group 2: Load Flow Calculation Generator Power Mode Diagram

Load Flow Calculation

Data Group 2. Diagrams

Generator Power Mode

UTIL-0001 0.0 kW 0.0 kVAR ubLF PQ A: 0.00 kW, 0.00 kVar B: 0.00 kW, 0.00 kVar C: 0.00 kW, 0.00 kVar UTILITY BUS 13800.0 V LF Voltage 0.00 V UTIL-F LF VD% 0.00 % 0.0 kW LF kW 0.00 kW 0.0 kVAR LF kVAR 0.00 kVAR Percent VD 0.0 % LF PF 0.00 LF 0 A T-UTIL-F P GEN T-UTILIT Y 160.2 kW S 0.0 kW 112.1 kVAR 0.0 kVAR SESH-F GEN-IB 0.0 kW 0.0 kVAR Percent VD 0.0 % LF 0 A SESH 208.0 V LF Voltage 0.00 V LF VD% 0.00 % SESH-MB GDPH-F LF kW 0.00 kW 160.2 kW LF kVAR 0.00 kVAR 112.1 kVAR LF PF 0.00 Percent VD 0.8 % LF 543 A SEDPH-F 0.0 kW 0.0 kVAR Percent VD 0.0 % LF 0 A GDPH-GB SEDPH 208.0 V GDPH LF Voltage 0.00 V 208.0 V LF VD% 0.00 % LF Voltage 206.31 V LF kW 0.00 kW LF VD% 0.81 % ATS-FB LF kVAR 0.00 kVAR ATS-FLS-FB ATS-EL EV-FB NDPH-FB LF kW 159.41 kW LF PF 0.00 ATS-EL EV-GM-F B ATS-FL S-GM-FB ATS-GM-FB Open EDPH-GMBB-FB LF kVAR 110.46 kVAR LF PF 0.82 ATS-F ATS-FL S-F ATS-EL EV-F ATS-ELEV-GM-F ATS-FLS-GM-F ATS-GM-F NDPH-F 0.0 kW 0.0 kW 0.0 kW 61.5 kW 6.6 kW 91.4 kW 0.0 kW 0.0 kVAR 0.0 kVAR 0.0 kVAR 45.9 kVAR 3.1 kVAR 61.4 kVAR 0.0 kVAR Percent VD 0.0 % Percent VD 0.0 % Percent VD 0.0 % Percent VD 0.4 % Percent VD 0.1 % Percent VD 0.2 % Percent VD 0.0 % LF 0 A LF 0 A LF 0 A LF 215 A LF 20 A LF 308 A LF 0 A A B A B A B EDPH-GMBB-F ATS-FL S ATS-EL EV ATS 0.0 kW 0.0 kVAR Percent VD 0.0 % EDPH-F LF 0 A 91.2 kW 61.3 kVAR Percent VD 0.4 % LF 308 A FLSDPH1-F FLSDPH2-F 6.6 kW 61.2 kW 3.1 kVAR 45.7 kVAR EDPH-MB Open EDPH-MBB Percent VD 0.1 % Percent VD 0.5 % LF 20 A LF 215 A NDPH EDPH 208.0 V 208.0 V LF Voltage 0.00 V LF Voltage 205.10 V LF VD% 0.00 % LF VD% 1.39 % Open NPH-FB UPS-RIB UPS-MBB-FB CH1-FB CH2-FB EPH1-FB EPH2-FB LF kW 0.00 kW LF kW 90.96 kW LF kVAR 0.00 kVAR LF kVAR 60.91 kVAR LF PF 0.00 LF PF 0.83 Exhuast Fans Unit Heaters Fan Coil Units CH1-F CH2-F 12.8 kVA 26.3 kVA 7.7 kVA 24.5 kW 0.0 kW 15.2 kVAR 0.0 kVAR Percent VD 0.9 % Percent VD 0.0 % UPS-RIB-F NPH-F FLSDPH1-MB LF 81 A LF 0 A 0.0 kW 22.8 kW 0.0 kVAR 17.0 kVAR Percent VD 0.9 % Percent VD 0.0 % FLSDPH1 FLS-ELEV LF 0 A LF 80 A 208.0 V 208.0 V LF Voltage 205.96 V CH1 CH2 LF Voltage 204.43 V LF VD% 0.98 % LF VD% 1.72 % FLS-ELEV-MB LF kW 6.57 kW LF kW 60.91 kW FLSDPH1-BB EPH1-F EPH2-F LF kVAR 3.11 kVAR LF kVAR 45.46 kVAR 9.6 kW 34.0 kW LF PF 0.90 LF PF 0.80 UPS 7.2 kVAR 21.5 kVAR Percent VD 0.3 % Percent VD 0.9 % FLS-Load SF-1 ELEV-F LF 34 A LF 113 A CH1-MTR-F CH2-MTR-F 5.4 kVA 2 hp 60.9 kW 24.3 kW 0.0 kW 45.5 kVAR UPS-MBP-F UPS-MBP-MMB-F Percent VD 0.9 % 15.0 kVAR 0.0 kVAR 22.6 kW 0.0 kW Percent VD 0.1 % Percent VD 0.0 % NPH-MB LF 215 A 16.9 kVAR 0.0 kVAR LF 81 A LF 0 A Percent VD 0.4 % Percent VD 0.0 % LF 80 A LF 0 A NPH 208.0 V LF Voltage 0.00 V ELEV LF VD% 0.00 % CH1-MTR CH2-MTR LF kW 0.00 kW 22.56 kW 22.56 kW Open EPH1-MB EPH2-MB LF kVAR 0.00 kVAR UPS-MIB UPS-MBB LF PF 0.00 NPH-BB ELEV-MTR-F 60.3 kW UPS-MBP EPH1 EPH2 NPH-Load 45.2 kVAR 208.0 V 208.0 V 208.0 V 15 kVA Percent VD 0.2 % LF Voltage 202.30 V LF Voltage 204.54 V LF Voltage 203.18 V LF 215 A LF VD% 2.74 % LF VD% 1.67 % LF VD% 2.32 % LF kW 22.44 kW LF kW 9.60 kW LF kW 33.67 kW EPH1-BB EPH2-BB LF kVAR 16.82 kVAR CPL1-FB LF kVAR 7.20 kVAR LF kVAR 21.38 kVAR LF PF 0.80 LF PF 0.80 LF PF 0.84 CPL2-Load 14 kVA ELEV-MTR 75 hp EPH1-Load EPH2-Load EPH2-MTR 12 kVA 4.9 kVA 35 kVA CPL1-F 11.2 kW 8.4 kVAR Percent VD 0.3 % LF 40 A CPL1-MB CPL1 208.0 V LF Voltage 201.62 V LF VD% 3.07 % LF kW 11.20 kW LF kVAR 8.40 kVAR CPL1-Load CPL1-BB LF PF 0.80 14 kVA

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Appendix F

Data Group 2: Load Flow Calculation Maintenance Mode – Isolate ATS Diagram

A B A B A B

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Appendix F

Data Group 2: Load Flow Calculation Maintenance Mode – Isolate UPS Diagram

Load Flow Calculation

Data Group 2. Diagrams

Maintenance Mode - Isolate UPS

UTIL-0001 0.0 kW 0.0 kVAR ubLF PQ A: 0.00 kW, 0.00 kVar B: 0.00 kW, 0.00 kVar C: 0.00 kW, 0.00 kVar UTILITY BUS 13800.0 V LF Voltage 0.00 V UTIL-F LF VD% 0.00 % 0.0 kW LF kW 0.00 kW 0.0 kVAR LF kVAR 0.00 kVAR Percent VD 0.0 % LF PF 0.00 LF 0 A T-UTIL-F GEN P T-UTILIT Y 91.6 kW 61.9 kVAR S 0.0 kW 0.0 kVAR SESH-F GEN-IB 0.0 kW 0.0 kVAR Percent VD 0.0 % LF 0 A SESH 208.0 V LF Voltage 0.00 V LF VD% 0.00 % SESH-MB GDPH-F LF kW 0.00 kW 91.6 kW LF kVAR 0.00 kVAR 61.9 kVAR LF PF 0.00 Percent VD 0.5 % LF 307 A SEDPH-F 0.0 kW 0.0 kVAR Percent VD 0.0 % GDPH-GB LF 0 A SEDPH 208.0 V GDPH LF Voltage 0.00 V 208.0 V LF VD% 0.00 % LF Voltage 207.05 V LF kW 0.00 kW LF VD% 0.46 % ATS-FB LF kVAR 0.00 kVAR ATS-FLS-FB ATS-EL EV-FB NDPH-FB LF kW 91.36 kW LF PF 0.00 ATS-EL EV-GM-F B ATS-FL S-GM-FB ATS-GM-FB Open EDPH-GMBB-FB LF kVAR 61.41 kVAR LF PF 0.83 ATS-F ATS-FL S-F ATS-EL EV-F ATS-ELEV-GM-F ATS-FLS-GM-F ATS-GM-F NDPH-F 0.0 kW 0.0 kW 0.0 kW 0.0 kW 0.0 kW 91.4 kW 0.0 kW 0.0 kVAR 0.0 kVAR 0.0 kVAR 0.0 kVAR 0.0 kVAR 61.4 kVAR 0.0 kVAR Percent VD 0.0 % Percent VD 0.0 % Percent VD 0.0 % Percent VD 0.0 % Percent VD 0.0 % Percent VD 0.2 % Percent VD 0.0 % LF 0 A LF 0 A LF 0 A LF 0 A LF 0 A LF 307 A LF 0 A A B A B A B EDPH-GMBB-F ATS-FL S ATS-EL EV ATS 0.0 kW 0.0 kVAR Percent VD 0.0 % EDPH-F LF 0 A 91.2 kW 61.2 kVAR Percent VD 0.4 % LF 307 A FLSDPH1-F FLSDPH2-F 0.0 kW 0.0 kW 0.0 kVAR 0.0 kVAR EDPH-MB Open EDPH-MBB Percent VD 0.0 % Percent VD 0.0 % LF 0 A LF 0 A NDPH EDPH 208.0 V 208.0 V LF Voltage 0.00 V LF Voltage 205.85 V LF VD% 0.00 % LF VD% 1.03 % Open NPH-FB UPS-RIB UPS-MBB-FB CH1-FB CH2-FB EPH1-FB EPH2-FB LF kW 0.00 kW LF kW 90.95 kW LF kVAR 0.00 kVAR LF kVAR 60.88 kVAR LF PF 0.00 LF PF 0.83 Exhuast Fans Unit Heaters Fan Coil Units CH1-F CH2-F 12.8 kVA 26.3 kVA 7.7 kVA 24.5 kW 0.0 kW 15.2 kVAR 0.0 kVAR Percent VD 0.9 % Percent VD 0.0 % UPS-RIB-F NPH-F LF 81 A LF 0 A FLSDPH1-MB 0.0 kW 0.0 kW 0.0 kVAR 0.0 kVAR Percent VD 0.0 % Percent VD 0.0 % FLSDPH1 FLS-ELEV LF 0 A LF 0 A 208.0 V 208.0 V LF Voltage 0.00 V CH1 CH2 LF Voltage 0.00 V LF VD% 0.00 % LF VD% 0.00 % FLS-ELEV-MB LF kW 0.00 kW LF kW 0.00 kW FLSDPH1-BB EPH1-F EPH2-F LF kVAR 0.00 kVAR LF kVAR 0.00 kVAR 9.6 kW 34.0 kW LF PF 0.00 LF PF 0.00 UPS 7.2 kVAR 21.5 kVAR Percent VD 0.3 % Percent VD 0.9 % FLS-Load SF-1 ELEV-F LF 34 A LF 113 A CH1-MTR-F CH2-MTR-F 5.4 kVA 2 hp 0.0 kW 24.3 kW 0.0 kW 0.0 kVAR UPS-MBP-F UPS-MBP-MMB-F Percent VD 0.0 % 15.0 kVAR 0.0 kVAR 0.0 kW 22.8 kW Percent VD 0.1 % Percent VD 0.0 % NPH-MB LF 0 A 0.0 kVAR 17.0 kVAR LF 81 A LF 0 A Percent VD 0.0 % Percent VD 1.3 % LF 0 A LF 80 A NPH 208.0 V LF Voltage 0.00 V ELEV LF VD% 0.00 % CH1-MTR CH2-MTR LF kW 0.00 kW 22.56 kW 22.56 kW Open EPH1-MB EPH2-MB LF kVAR 0.00 kVAR UPS-MIB UPS-MBB LF PF 0.00 NPH-BB ELEV-MTR-F 0.0 kW UPS-MBP EPH1 EPH2 NPH-Load 0.0 kVAR 208.0 V 208.0 V 208.0 V 15 kVA Percent VD 0.0 % LF Voltage 203.18 V LF Voltage 205.29 V LF Voltage 203.93 V LF 0 A LF VD% 2.32 % LF VD% 1.31 % LF VD% 1.96 % LF kW 22.44 kW LF kW 9.60 kW LF kW 33.67 kW EPH1-BB EPH2-BB LF kVAR 16.82 kVAR CPL1-FB LF kVAR 7.20 kVAR LF kVAR 21.38 kVAR LF PF 0.80 LF PF 0.80 LF PF 0.84 CPL2-Load 14 kVA ELEV-MTR 75 hp EPH1-Load EPH2-Load EPH2-MTR 12 kVA 4.9 kVA 35 kVA CPL1-F 11.2 kW 8.4 kVAR Percent VD 0.3 % LF 40 A CPL1-MB CPL1 208.0 V LF Voltage 202.51 V LF VD% 2.64 % LF kW 11.20 kW LF kVAR 8.40 kVAR CPL1-Load CPL1-BB LF PF 0.80 14 kVA

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JO 6950.27B

Appendix F

Data Group 2. Power Load-Flow Calculation Tabulation

System Parameters System Configuration Maintenance Configuration

Utility Standby Power Isolate ATS Isolate UPS

Power

Source Source: GEN GEN

T - Utility GEN EDPH - MBB UPS - MBB - FB

Line Equipment Field Mode 1A Mode 2 Mode 3 Mode 4

# Bus

1 CPL1 Nominal (V) 208.00 208.00 208 208

2 LF Voltage (V) 202.56 201.62 202.38 202.51

3 Voltage Drop (%) 2.62 3.07 2.7 2.64

4 LF kVA (kVA) 14.00 14.00 14 14

5 LF kW (kW) 11.2 11.2 11.2 11.2

6 LF PF 0.8 0.8 0.8 0.8

7 LF kVAR (kVAR) 8.4 8.4 8.4 8.4

8 LF Current (A) 39.9 40.09 39.94 39.91

9 EDPH Nominal (V) 208 208 208 208

10 LF Voltage (V) 206.02 205.1 205.85 205.85

11 Voltage Drop (%) 0.95 1.39 1.03 1.03

12 LF kVA (kVA) 109.46 109.47 109.46 109.44

13 LF kW (kW) 90.95 90.96 90.95 90.95

14 LF PF 0.83 0.83 0.83 0.83

15 LF kVAR (kVAR) 60.9 60.91 60.9 60.88

16 LF Current (A) 306.74 308.14 307 306.95

17 EPH1 Nominal (V) 208 208 208 208

18 LF Voltage (V) 205.46 204.54 205.28 205.29

19 Voltage Drop (%) 1.22 1.67 1.31 1.31

20 LF kVA (kVA) 12 12 12 12

21 LF kW (kW) 9.6 9.6 9.6 9.6

22 LF PF 0.8 0.8 0.8 0.8

23 LF kVAR (kVAR) 7.2 7.2 7.2 7.2

24 LF Current (A) 33.72 33.87 33.75 33.75

25 EPH2 Nominal (V) 208 208 208 208

26 LF Voltage (V) 204.11 203.18 203.93 203.93

27 Voltage Drop (%) 1.87 2.32 1.96 1.96

28 LF kVA (kVA) 39.88 39.88 39.88 39.88

29 LF kW (kW) 33.67 33.67 33.67 33.67

30 LF PF 0.84 0.84 0.84 0.84

31 LF kVAR (kVAR) 21.38 21.38 21.38 21.38

32 LF Current (A) 112.82 113.33 112.91 112.91

33 FLS - ELEV Nominal (V) 208 208 208 208

34 LF Voltage (V) 206.87 204.43 0 0

35 Voltage Drop (%) 0.54 1.72 0 0

36 LF kVA (kVA) 7.27 76 0 0

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Appendix F

Data Group 2. Power Load-Flow Calculation Tabulation (continued)

System Parameters System Configuration Maintenance Configuration

Utility Standby Power Isolate ATS Isolate UPS

Power

Source Source: GEN GEN

T - Utility GEN EDPH - MBB UPS - MBB - FB

Line Equipment Field Mode 1A Mode 2 Mode 3 Mode 4

# Bus

37 LF kW (kW) 6.57 60.91 0 0

38 LF PF 0.9 0.8 0 0

39 LF kVAR (kVAR) 3.11 45.46 0 0

40 LF Current (A) 20.29 214.65 0 0

41 FLSDPH1 Nominal (V) 208 208 208 208

42 LF Voltage (V) 205.35 205.96 0 0

43 Voltage Drop (%) 1.27 0.98 0 0

44 LF kVA (kVA) 76 7.27 0 0

45 LF kW (kW) 60.9 6.57 0 0

46 LF PF 0.8 0.9 0 0

47 LF kVAR (kVAR) 45.46 3.11 0 0

48 LF Current (A) 213.67 20.38 0 0

49 GDPH Nominal (V) 208 208 208 208

50 LF Voltage (V) 0 206.31 207.05 207.05

51 Voltage Drop (%) 0 0.81 0.46 0.46

52 LF kVA (kVA) 0 193.94 110.1 110.08

53 LF kW (kW) 0 159.41 91.36 91.36

54 LF PF 0 0.82 0.83 0.83

55 LF kVAR (kVAR) 0 110.46 61.43 61.41

56 LF Current (A) 0 542.74 307 306.95

57 NDPH Nominal (V) 208 208 208 208

58 LF Voltage (V) 206.69 0 0 0

59 Voltage Drop (%) 0.63 0 0 0

60 LF kVA (kVA) 61.52 0 0 0

61 LF kW (kW) 54.21 0 0 0

62 LF PF 0.88 0 0 0

63 LF kVAR (kVAR) 29.09 0 0 0

64 LF Current (A) 171.85 0 0 0

65 NPH Nominal (V) 208 208 208 208

66 LF Voltage (V) 205.98 0 0 0

67 Voltage Drop (%) 0.97 0 0 0

68 LF kVA (kVA) 15 0 0 0

69 LF kW (kW) 12 0 0 0

70 LF PF 0.8 0 0 0

71 LF kVAR (kVAR) 9 0 0 0

72 LF Current (A) 42.04 0 0 0

73 SEDPH Nominal (V) 208 208 208 208

74 LF Voltage (V) 207.22 0 0 0

75 Voltage Drop (%) 0.37 0 0 0

76 LF kVA (kVA) 255.29 0 0 0

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Appendix F

Data Group 2. Power Load-Flow Calculation Tabulation (continued)

System Parameters System Configuration Maintenance Configuration

Utility Standby Power Isolate ATS Isolate UPS

Power

Source Source: GEN GEN

T - Utility GEN EDPH - MBB UPS - MBB - FB

Line Equipment Field Mode 1A Mode 2 Mode 3 Mode 4

# Bus

77 LF kW (kW) 213.71 0 0 0

78 LF PF 0.84 0 0 0

79 LF kVAR (kVAR) 139.65 0 0 0

80 LF Current (A) 711.28 0 0 0

81 SESH Nominal (V) 208 208 208 208

82 LF Voltage (V) 207.71 0 0 0

83 Voltage Drop (%) 0.14 0 0 0