Arc Flash Study 2016 Schneider Full Facility.pdf

Power System Engineering

3030 Saturn Street, Suite 100 Brea, CA 92821

(626) 893-8419

COVER LETTER

COVER PAGE

SHORT-CIRCUIT,

OVERCURRENT DEVICE COORDINATION, &

ARC FLASH HAZARD ANALYSES

VA Loma Linda Healthcare System Loma Linda, CA

Prepared by Edison T. Nguyen, P.E.

Schneider Electric Engineering Services, LLC

Job Number - March 22, 2016 Q2C: 37151901 Rev. 1 -

Rev. 2 - Rev. 3 -

This document has been authorized for release by the engineer whose seal and signature are hereto affixed. Altering this document is unlawful unless performed by or under the direction of a licensed professional engineer. Any changes shall be described and the engineer authorizing such alterations shall seal, sign, and date the revised document.

FILE: 37151901 - VA Loma Linda Healthcare System

SESA106097

CA New Stamp

March 2016

DISCLAIMER

The following report was prepared by the Power System Engineering group of Schneider Electric Engineering Services, LLC (SEES) utilizing industry-accepted standards and practices along with the proprietary methodologies and analysis tools of SEES. Data used in this analysis was acquired by Power System Engineering and provided by others, through onsite discovery, published information, equipment nameplates, manufacturer ratings, testing, analysis, or other means. SEES assumes no responsibility for inaccuracies in data provided by others. The study is intended for use by qualified individuals to facilitate the installation, operation, maintenance, and safety of the electrical power system depicted. Modification of equipment, changes to system configuration, adjustment of protective device settings, or failure to properly maintain equipment may invalidate these results.

The stylized trademarks “Square D” and “Schneider Electric” and any other trademarks and trade names that are the property of Schneider Electric USA, Inc are used by permission.

TABLE OF CONTENTS

1 EXECUTIVE SUMMARY

1.1 Overview

1.2 Revision History

2 INTRODUCTION

3 SYSTEM FINDINGS

3.1 Study Analysis

3.1.1 Short-Circuit

3.1.2 Coordination

3.1.3 Arc Flash

4 SHORT-CIRCUIT ANALYSIS

4.1 General Procedure

4.2 Data Used in the Calculations

4.2.1 Power Company Data

4.2.2 Generator Data

4.2.3 Cable Data

4.2.4 Transformer Data

4.2.5 Motor Contribution to Short-Circuit Current

4.2.6 Assumptions and Estimates

4.3 Short-Circuit Analysis Results and Recommendations

4.4 Short-Circuit Evaluation Tables

5 OVERCURRENT DEVICE COORDINATION ANALYSIS

5.1 General Procedure

5.2 Specific Procedure

5.2.1 Short-Circuit Current Considerations

5.2.2 Molded Case Breaker Coordination

5.2.3 Fuse Coordination

5.2.4 Time-Overcurrent Relay Coordination

5.2.5 Low-Voltage Ground-Fault Relay Settings

5.2.6 Transformer Protective Devices

5.2.7 Cable Protection

5.2.8 Selective Coordination and the National Electric Code

5.2.9 Assumptions and Estimates

5.3 Analysis of Results and Recommendations

5.3.1 NEC Compliance Issues

5.4 Overcurrent Device Setting Tables

5.5 Time-Current Coordination Graphs - As Found Settings

6 ARC FLASH HAZARD ANALYSIS

6.1 General Procedure

6.2 Specific Procedure

6.3 AF Hazard Analysis Results and Recommendations

6.3.1 Common Arc Flash Hazard Table Terms

6.3.2 Protective Arc Rated (AR) Clothing Characteristics

6.3.3 Arc Flash Hazard Analysis Table – As-Found Settings

6.4 Power System Engineering Arc Flash Labeling Practice

6.4.1 Arc Flash Information Labels

6.4.2 General Safety Labels

APPENDIX A: ABBREVIATIONS AND TRADEMARKS

APPENDIX B: SHORT CIRCUIT INPUT/OUTPUT DATA

APPENDIX C: REFERENCES

APPENDIX D: SYSTEM STUDY ONE-LINE DIAGRAMS

1 EXECUTIVE SUMMARY

1.1 Overview

This report documents the results of a Power System Engineering analysis for the VA Loma Linda Healthcare System in Loma Linda, CA. The objective of this section is to briefly summarize the results of the analysis and highlight key issues and findings in the electrical distribution equipment. For items addressed by equipment, conductor, or device settings changes, the power system study results may need to be re-evaluated in a revision to this study. The full analysis can be found in the main body of the report.

The scope of this study is limited to that equipment shown on the study one-line diagrams located in the back of the report.

1.2 Revision History

This section will document revision history after the initial study has been submitted. Subsequent revision numbers are each listed on the front cover of the report and are explained below by indicating the following details: date of issue, reason for revision, and who initiated the revision.

When necessary, engineer’s comments and/or pertinent emails will be referred to in the references section of the report.

2 INTRODUCTION

This report has the following components:

Studies were performed using nationally recognized electrical engineering analysis software.

The system short-circuit analysis evaluates the adequacy of the distribution equipment shown on the enclosed one-line diagrams to withstand or to interrupt the calculated maximum available short-circuit current at its location.

The overcurrent device time-current coordination analysis determines the suggested settings and, where appropriate, the ampere ratings and types for the electrical power system protective devices to achieve the desired system protection and electrical service continuity goals.

The arc flash analysis establishes the arc flash boundary around electrical equipment within which a worker exposed to an arcing fault would expect to receive 2nd degree burns if not adequately protected. The analysis also determines the incident energy levels at specific working distances from equipment, which can be used to select appropriate personal protective equipment (PPE) to be worn when working within the arc flash boundary.

This report supersedes and invalidates results from any prior study for the scope of equipment being reviewed.

Electrical system changes within the facility or in the utility system can have a significant impact on the results of this power system analysis, which is a “snapshot” of as-found system conditions. As such, it is recommended that this analysis be re-evaluated on a regular basis, not to exceed 5 years, to account for electrical system changes. NFPA 70B and 70E address the issue of equipment maintenance and failure to properly maintain equipment may invalidate these results

Abbreviations and trademarks referenced throughout this report are also listed in an appendix.

3 SYSTEM FINDINGS

3.1 Study Analysis

Refer to each of the following sections for details. If issues are addressed by equipment, conductor, or device settings changes, the power system study results may need to be re-evaluated in a revision to this study.

3.1.1 Short-Circuit

Of the 613 device locations evaluated for adequacy to interrupt or withstand the maximum three-phase short-circuit current to which they could be subjected, 59 device locations were identified to be INADEQUATE. The Short-Circuit Evaluation Table lists equipment that was not evaluated because the equipment’s rating could not be determined.

Inadequate

10%

Adequate 90%

Graph of equipment short-circuit capability

It’s recommended to replace or upgrade all panels listed “INADEQUATE” in tables in section 4.4 of the report.

Field verify equipment that may have short-circuit current ratings for the items shown as #N/A in the short-circuit comparison table notes column.

3.1.2 Coordination

A modified coordination study was performed using the instantaneous area of the overcurrent device time current curves. Although there are some unavoidable overlaps in the curves (device do not coordinate) reasonable coordination has been achieved. Copies of the time current curves are included in this report.

3.1.3 Arc Flash

639 locations were analyzed to determine the level of arc flash incident energy to which a worker might be exposed during an arc flash event. The majority of locations were determined to be 8 cal/cm2, or less. It is not recommended work be performed live for equipment with the “Over 40 cal/cm2” designation (32 locations). Equipment protected by a transformer primary overcurrent device generally results in long trip delay times which cannot be adjusted lower because of the load and/or transformer inrush or due to limitations, or non-adjustability, of the protective device.

Knowing the actual device information for this project will not likely result in any improvement.

A common industry approach is to use a two level clothing system, with protection at 8 cal/cm2 and 40 cal/cm2. This approach simplifies what workers have to select/wear as well as what companies have to issue to their employees.

Graph of arc flash hazard incident energy occurrence

The results of the arc flash analysis show both the calculated arc flash incident energy (AFIE) and arc flash boundary distances at each piece of equipment under study.

Overly conservative available fault current values should not be used solely for an arc flash analysis. Therefore, three arc flash fault current scenarios were considered. The results of all the scenarios were combined into one composite table showing the worst case results for each piece of equipment evaluated.

1. Utility and Beloit Generator Paralleled with LV Ties Open

2. Utility and Beloit Generator Paralleled with LV Ties Closed

3. Generators/Emergency Fed Case

It is recognized that recommendations in this report may not be implemented simultaneously. It is Customer’s responsibility to apply and update labels as recommendations are implemented or as conditions change.

There were 32 locations where the arc flash incident energy level is over 40 cal/cm2 which is considered the upper limit defined by NFPA 70E. The results from the arc flash hazard analysis are no substitutes for safe work practices. As stated in NFPA 70E, burn injuries can occur even when adequate PPE is employed; and standard arc rated PPE may provide little or no protection against arc blast and its effects. Protection from arc flash can best be provided by working only on circuits or equipment that has been placed in an electrically safe work condition. Work should not be performed on or near equipment over 40 cal/cm2 unless it has been placed in an electrically safe work condition.

4 SHORT-CIRCUIT ANALYSIS

4.1 General Procedure

An electrical system short-circuit analysis is used for the following:

1) To compare the calculated maximum fault current with the interrupting ratings of overcurrent protective devices such as fuses and circuit breakers.

2) To investigate applicable short-circuit series ratings and the protection of electrical equipment by current-limiting devices.

3) To verify the adequacy of other equipment, such as switches and equipment bussing, to withstand the effects of the calculated maximum fault current levels.

4) To assist in the selection and/or determination of settings for relays, fuses and circuit breakers.

5) To provide input (along with device trip characteristics) to an arc flash hazard analysis.

This analysis calculates maximum available three-phase, RMS symmetrical, short-circuit amperes at each piece of equipment in the system. The calculation procedures are based on recommendations included in ANSI/IEEE standards C37.13, C37.010, and C37.5.

The modeling software simulates a bolted three-phase fault at each point of consideration in the system and calculates the maximum available short-circuit current at that point without any reduction due to current-limiting overcurrent devices which may be present. (However, the effects of current-limiting devices are considered when determining the adequacy of the equipment.) The calculated short-circuit values are RMS symmetrical amperes and are comparable with the RMS symmetrical short-circuit ratings of electrical equipment.

Electrical distribution equipment must be able to withstand and/or interrupt the most severe fault duty that it may be subjected to at its location in the system. In particular, NEC Section 110.9 requires circuit breakers to have a rating sufficient for interrupting the maximum available fault current present at their line side terminals. For locations where calculated fault currents exceed the ratings of the equipment, recommendations for corrective actions are provided.

Equipment short-circuit withstand and interrupting ratings are expressed in symmetrical RMS current. However, fault currents are not purely symmetrical in practice, as system inductance introduces a degree of asymmetry for at least the first few cycles of a fault. The magnitude and duration of this asymmetrical component depends on several factors, including characteristics of system components (conductors, transformers, and loads) and the exact point on the current waveform that the fault begins—the level of asymmetry even differs from phase to phase in a three-phase system. Because of the uncertainty in asymmetry for a given fault event, the capability of devices to interrupt asymmetrical fault current is based on the maximum possible asymmetrical fault current level at the point of application. The more inductive the circuit, as measured by the calculated system X/R ratio, the more asymmetrical the fault current can be. If the calculated X/R level exceeds a certain level, then the increased asymmetrical duty must be taken into account when breaker ratings are assessed.

Low-voltage circuit breakers and fuses are tested to establish their interrupting ratings based on a circuit with a fixed X/R ratio, as defined in the various product standards (UL and ANSI). For example, an ANSI low-voltage power circuit breaker is tested in a circuit with an X/R ratio of

6.591. If such a breaker is applied at a system bus with a calculated X/R ratio of 6.591 or less and the calculated RMS symmetrical fault current is within the symmetrical interrupting rating of the breaker, then it is assumed that the breaker is also able to interrupt and withstand the asymmetrical current resulting from a fault at that location. If a low voltage breaker is applied at a location with an X/R ratio greater than that of the design test circuit, the calculated fault current must be multiplied by an adjustment factor that accounts for this. This resultant “fault duty,” which is greater than the calculated fault current, is then compared to the breaker’s interrupting rating in order to determine if the breaker is adequately rated. Different classes of low-voltage breakers have different test X/R values, and each type has its own set of multiplication factors. Design test circuit power factors and associated X/R ratios are as shown in Table 1. The low-voltage short-circuit output report shows the calculated fault duty levels calculated at each bus, and when these values differ from the calculated short-circuit current levels, they are used in the device evaluation tables. See IEEE 1015-1997, IEEE Recommended Practice for Applying Low-Voltage Circuit Breakers Used in Industrial and Commercial Power Systems, for additional details.

Table 1: Summary of Test Power Factor and X/R Values for LV Devices.

Device pf X/R Ratio Power circuit breaker, unfused 0.15 6.591 Power circuit breaker, fused 0.20 4.899

Molded case breaker, interrupting rating greater than 20000 A 0.15-0.20 6.591-4.899

Molded case breaker, interrupting rating 10001 to 20000 A 0.25-0.30 3.9-3.18

Molded case breaker, interrupting rating 10000 A and less 0.45-0.50 2.0-1.732

For power circuit breakers, the power factors are taken from ANSI/IEEE C37.13. For molded case breakers, the power factors are taken from NEMA standard AB1. Since the NEMA standard specifies a range of test circuit power factors, the highest value (lowest X/R ratio) is used to determine the multiplying factor. This produces the most conservative (largest) factor.

For medium-voltage and high-voltage breakers rated on a symmetrical current basis, the effects of system X/R and asymmetrical current are handled similarly. For the breakers’ interrupting ratings, the multiplying factors are not listed in a table but instead are derived from graphs shown in ANSI C37.010-1999, IEEE Application Guide for AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis. The software calculates and applies these multiplying factors automatically when the system X/R value exceeds 15 for 2, 3 and 5-cycle breakers, or 10 for 8-cycle breakers. The breaker momentary fault current, though calculated in the first cycle after the fault when the fault current is typically highly asymmetrical, is also expressed in RMS symmetrical amperes. Based on this, the analysis software calculates the momentary duty based on both RMS amperes and amperes crest, so that the calculated duties can be compared to breakers with either type of momentary rating.

For some solidly-grounded systems, like close-coupled unit substations and generator gear, it is possible the bolted three-phase fault current is not the maximum fault current. The power systems engineer performing the study considered applicable buses and has reported bolted line-to-ground fault current when required. Actual distribution system zero sequence impedance (Z0) values are difficult to calculate. Due to the uncertainty in actual Z0 values, the zero sequence impedances used by the computer program were based on simple, conservative linear relationships with the corresponding positive sequence impedances (Z1). Conservative assumptions for Z0 values can result in conservative fault current values; however, actual system bolted line-to-ground fault currents can exceed the three-phase fault current values for some solidly-grounded systems.

The included one-line diagrams are a simplified version of the system drawings, showing only those parts of the electrical system under consideration. The various circuit locations on the diagrams have been labeled with bus identification numbers so input data could be supplied to the computer and the computer output could be readily interpreted.

4.2 Data Used in the Calculations

4.2.1 Power Company Data

The VA Medical Center in Loma Linda, California is fed by two utility feeders at 12KV. SCE has advised the maximum fault current produced at 12KV. This information is indicated at bus 01-00 located on the first one-line drawing. This value determined the starting point for the short-circuit analysis.

4.2.2 Generator Data

The emergency generation system is shown on drawings D-ML-04-368-1 and D-ML-04-368-12.

Building 1 has one 3125kVA generator. The generator yard has four 631kVA generators. An X/R ratio of 20 has been considered for each generator less than 875kVA to facilitate the arc-flash analysis calculation. An X/R ratio of 26.1 was used for the 3125kVA generator. In all instances the fault current available from the emergency generation source is less than from the normal source. The equipment evaluation in section 4.4 is made considering the more conservative utility or normal source in parallel with the 3125kVA generator. Therefore, if equipment is evaluated as adequate when served from the normal source in parallel with the 3125kVA generator, it will also remain adequate when served only from any of the generator sources.

4.2.3 Cable Data

The conductor (cable and/or busway) data used for each circuit segment are shown in the SHORT CIRCUIT INPUT/OUTPUT DATA appendix. Included are lengths, number per phase, size, conductor material, cable insulation type, conduit material and resistance and reactance values.

Also, conductor lengths, number per phase, and size and conductor material are recorded on the one-line diagrams.

Resistance values are based on 25 degrees Celsius (room temperature) rather than the full load temperature usually shown in descriptive literature because short-circuits can occur when the circuit is initially energized or lightly loaded as well as when fully loaded.

4.2.4 Transformer Data

Nameplate transformer percent impedance and typical X/R ratio values were used for all transformers. The exact R and X component values used are shown in the SHORT CIRCUIT INPUT/OUTPUT DATA appendix.

4.2.5 Motor Contribution to Short-Circuit Current

Motor contribution to the short-circuit current is taken into account in this short-circuit analysis.

During the first few cycles of a fault, running motors act as generators and produce a current which will combine with the source short-circuit current flowing to the fault as illustrated in Figure 1. Sources may be, but are not limited to, the Power Company, local generators, or both.

Figure 1: Example motor contribution.

Connected motors shown on the study one-line were assumed to be running at the time of the fault. Motors fed by adjustable speed drives equipped with bypass contactors were considered to contribute to system fault currents as well. However, motors fed by drives without bypass contactors were not considered since they do not contribute to fault current. Redundant motors shown on the study one-line were also assumed to be running at the time of the fault unless operating controls prohibit these conditions.

A motor’s contribution to a fault at its terminals is equal to the full-load ampere (FLA) rating of the motor divided by its per-unit subtransient reactance, similar to the contribution from a generator. However, at the upstream switchboard, panelboard, or motor-control center, the fault contribution from the individual motors is reduced by the impedance of the motor branch circuit conductors. Since data on motor subtransient reactances and branch-circuit conductor lengths is often difficult to obtain, assumptions regarding the motors’ subtransient reactances are typically made when the system model is built.

For calculation of low-voltage fault duty, the contribution from induction motors and synchronous motors in the system are considered. For small induction motors (less than 50 hp) where the impedance of the installation (i.e., motor and conductor) is not known, an equivalent subtransient reactance of 0.25 pu, resulting in a fault contribution of 4 times rated current, is assumed. Larger motors (50 hp and above) have an assumed subtransient reactance of 0.2 pu, resulting in a fault contribution of 5 times rated current. This is consistent with recommendations in IEEE Std. 141, IEEE Recommended Practice for Electric Power Distribution for Industrial Plants (the IEEE Red Book).

If applicable, multiplying factors are adjusted per Table 7 of ANSI/IEEE C37.010, IEEE Application Guide for AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis for medium/high voltage fault duty. The table also shows contributions from induction motors less than 50 hp to be neglected.

The motor short-circuit contribution is determined and included in the computer short-circuit analysis so that the results should represent the highest short-circuit current to which the equipment might be subjected.

4.2.6 Assumptions and Estimates

Some assumptions, or estimates, were required and may affect the results of this study. In general, assumptions, or estimates, are needed because of limited access, safety concerns in obtaining equipment nameplate data, or lack of documentation. Significant differences between the assumptions, or estimates, listed here and actual values will require that this power system analysis be revised.

The following assumptions, or estimates, were made for the reasons given above:

1. Where conductor lengths were not available, a length of 10 feet was used.

2. Where conductor sizes could not be determined, cables sized per NEC 2014 Edition table 310.15(B)(16) were used in the analysis.

3. Equivalent ampacity Square D busway impedance values were used for busway runs where exact impedance data is unknown.

4. For low-voltage circuit breakers where the adjustable setting(s) was undeterminable, the proposed setting(s) was used.

5. CLE-2 fuses were assumed for some of the transformer primary switches.

6. Fusible panelboards are Westinghouse and rated 50KA unless otherwise noted.

7. Subtransient reactances were assumed for all generators and are noted on the one-line diagrams.

4.3 Short-Circuit Analysis Results and Recommendations

After making the calculations, the distribution equipment was checked to determine its adequacy to interrupt or withstand the effects of the calculated maximum short-circuit current at its location.

For some solidly-grounded systems, like close-coupled unit substations and generator gear, it is possible the bolted three-phase fault current is not the maximum fault current. The power systems engineer performing the study considered applicable buses and has reported bolted line-to-ground fault current when required. The results are listed in the "SHORT-CIRCUIT EVALUATION

TABLE".

Listed in the table are the calculated short-circuit currents at each piece of equipment and the lowest rated device in the equipment enclosure. Comparing the two sets of values shows that much of the equipment examined is adequate. However there are also many locations where equipment is noted as INADEQUATE.

This study recommends a review of INADEQUATE equipment noted in table 4.4 and replacement of breakers or entire equipment as required to ensure proper application.

It’s also recommended to replace old panel D1AL in order to reduce the fuses inventory.

There are several breakers rated at 480V installed on existing 208V rated panels (4ALB, 4ALD, 3ULD, 4ULA, 4ULD, 2MLC, 2XLC, 3XLE, 3PLC, 3LLC, and 3LLA. These breakers should be replaced to 208V rated breakers to avoid NEC violations.

There are two breakers rated at 240V installed on existing panel 07-22 SPD HA rated at 480V. These breakers should be replaced to avoid NEC violations.

Field verify equipment that may have short-circuit current ratings for the items shown as #N/A in the short-circuit comparison table notes column. Make sure the equipment is adequately rated.

If applicable, equipment using series ratings that are shown in the short-circuit evaluation table must meet field labeling requirements per NEC Sections 110.22 and 240.86(B). There are two types of markings which must be present; the first requires series combination ratings to be marked on equipment by the manufacturer. The second equipment marking must be readily visible and state the following:

CAUTION – SERIES COMBINATION SYSTEM RATED _____ AMPERES.

IDENTIFIED REPLACEMENT COMPONENTS REQUIRED.

This labeling serves as a warning to those who may install new breakers or replace existing breakers at the given location in the future, alerting them to the fact that a specific device type must be used in order to ensure that the series rating is maintained.

Though not shown in the table, the momentary short-circuit duty for medium-voltage equipment was also evaluated vs. the corresponding equipment ratings. For equipment shown as “adequate”, both the momentary and interrupting ratings were found to be adequate.

NEC 110.9 requires equipment to have a rating sufficient for interrupting the maximum available fault current present at the line side terminals of the equipment. NFPA 70E Article 210 also requires electrical equipment to have appropriate ratings to withstand or interrupt the available fault current. Where calculated available fault currents exceed the ratings of the equipment, remedial action, possibly including upgrade or replacement of the affected equipment, is required to comply with the NEC, NFPA 70E, and OSHA regulations. A risk of equipment damage, property damage, and personal injury exists when equipment has either inadequate withstand ratings or contains overcurrent protective devices (OCPDs) with inadequate interrupting ratings.

Equipment with inadequate ratings in this category can suffer damage which may include bent busbars, melted contactors, ruptured enclosures, or OCPDs may not be able to interrupt faults (three-phase bolted or arcing) properly.

Input data and short-circuit output data are included in the appendices.

4.4 Short-Circuit Evaluation Tables

VA Loma Linda Healthcare System Loma Linda, CA

POWER SYSTEM ENGINEERING Q2C #37151901

SHORT-CIRCUIT

EVALUATION TABLE

EQUIP. DESCRIPTION LOWEST RATED DEVICE MAXIMUM LINE SIDE LINE SIDE

BUS PER SYSTEM ONE NOMINAL IN EQUIPMENT ENCLOSURE AVAILABLE X/R MAXIMUM SERIES NOTES NO. LINE DIAGRAM(S) L-L VOLTS TYPE AIC OR WCR SCA OR DUTY RATIO DEVICE RATING EVALUATION #

01-00 NORTH 12000.0 150-DHP 500 18,000 7,332 11.943 Adequate

01-01 BELOIT GEN 12000.0 #N/A 1,584 22.322 #N/A

01-02 SOUTH 12000.0 150-DHP 500 18,000 1,584 22.185 Adequate, , q 01-03 US1B 12000.0 WLI 25,000 6,890 8.351 Adequate 01-04 US1A 12000.0 WLI 25,000 7,011 8.978 Adequate 01-05 US3B 12000.0 WLI 25,000 6,923 8.508 Adequate 01-06 US3A 12000.0 WLI 25,000 6,934 8.567 Adequate 01-07 US4B 12000.0 WLI 25,000 7,319 11.791 Adequate 01-08 US4A 12000.0 WLI 25,000 7,307 11.665 Adequate 01-09 US5A 12000.0 WLI 25,000 1,583 22.004 Adequate

01 09 US5A ALT 12000 0 WLI 25 000 7 305 11 636 Ad01-09 US5A ALT 12000.0 WLI 25,000 7,305 11.636 Adequate 01-10 US5B 12000.0 WLI 25,000 1,583 21.841 Adequate

01-10 US5B ALT 12000.0 WLI 25,000 7,283 11.441 Adequate 01-11 US2B 12000.0 WLI 25,000 7,237 11.023 Adequate 01-12 US2A 12000.0 WLI 25,000 7,224 10.914 Adequate 01-13 US-6 12000.0 WLI 25,000 7,269 11.322 Adequate

01-14 US-6 SEC 4160.0 50-DHP 250 29,000 5,777 12.034 Adequate 01-15 CNTRFGL 4160 0 BUS 6 500 5 770 11 910 Adequate01 15 CNTRFGL 4160.0 BUS 6,500 5,770 11.910 Adequate

01-16 CH-2 4160.0 SCCR50 50,000 5,739 10.813 Adequate 01-17 CH-1 4160.0 SCCR50 50,000 5,750 11.187 Adequate

01A-00 Fuel Cell #1 480.0 SCCR200 200,000 30,294 9.211 Adequate 01A-01 Fuel Cell #2 480.0 SCCR200 200,000 30,074 9.104 Adequate

01A-02 DP-FCH 480.0 SCCR65 65,000 31,441 9.819 Adequate 02-00 US1B 480.0 DS-632 65,000 27,288 6.746 Adequate

02-01 MDBA 480.0 SCCR65 65,000 25,596 5.459 Adequate 02-02 DPHH 480.0 FD/C-H 35,000 14,948 1.788 Adequate 02-05 D1AH 480.0 SCCR50 50,000 22,767 4.561 Adequate 02-06 D1AL 208.0 SCCR50 50,000 7,603 3.186 Adequate 02-07 1ALA 208.0 SCCR10 10,000 7,827 2.502 Adequate 02-08 1ALB 208.0 SCCR10 10,000 7,761 2.468 Adequate 02-09 1ALC 208.0 SCCR10 10,000 4,834 0.987 Adequate 02-10 1ALD 208.0 SCCR10 10,000 6,975 1.993 Adequate 02 11 1ALE 208 0 SCCR10 10 000 2 894 0 674 Adequate02-11 1ALE 208.0 SCCR10 10,000 2,894 0.674 Adequate 02-12 1AHA 480.0 FD/C-H 35,000 19,558 2.418 Adequate

02-13 IPC-XRB 480.0 SCCR14 14,000 5,460 1.058 Adequate 02-14 BAH 480.0 SCCR14 14,000 11,729 0.852 Adequate

#N/A = Number not available.

SCET Page 1 of 18

[Form Ver. 3.6]

POWER SYSTEM ENGINEERING Q2C #37151901

SHORT-CIRCUIT

EVALUATION TABLE

EQUIP. DESCRIPTION LOWEST RATED DEVICE MAXIMUM LINE SIDE LINE SIDE

BUS PER SYSTEM ONE NOMINAL IN EQUIPMENT ENCLOSURE AVAILABLE X/R MAXIMUM SERIES NOTES NO. LINE DIAGRAM(S) L-L VOLTS TYPE AIC OR WCR SCA OR DUTY RATIO DEVICE RATING EVALUATION #

02-15 MCC MAA 480.0 SCCR65 65,000 21,016 4.041 Adequate

02-16 AH-7 480.0 #N/A 14,258 1.048 #N/A

02-17 AH-15 480.0 SCCR10 10,000 6,179 0.423 AdequateSCCR10 , , q 02-18 AH-23 480.0 SCCR10 10,000 5,539 0.389 Adequate 02-19 AH-31 480.0 SCCR10 10,000 4,943 0.358 Adequate 02-20 D2AH 480.0 SCCR50 50,000 21,016 4.041 Adequate 02-21 D2AL 208.0 SCCR50 50,000 7,439 3.116 Adequate 02-22 2ALA 208.0 SCCR10 10,000 7,409 2.340 Adequate 02-23 2ALB 208.0 SCCR10 10,000 7,291 2.283 Adequate 02-24 2ALC 208.0 SCCR10 10,000 7,179 2.229 Adequate 02-25 2ALD 208.0 BA 10,000 7,179 2.229 Adequate 02-26 2AHA 480.0 FD/C-H 35,000 16,844 1.604 Adequate 02-27 D3AH 480.0 SCCR50 50,000 19,814 3.746 Adequate 02-28 D3AL 208.0 SCCR50 50,000 9,079 3.224 Adequate 02-29 3ALA 208.0 SCCR10 10,000 7,697 1.728 Adequate 02-30 3ALB 208.0 SCCR10 10,000 8,795 2.287 Adequate 02-31 3ALC 208.0 SCCR10 10,000 8,712 2.255 Adequate 02-32 3ALD 208 0 SCCR10 10 000 8 628 2 223 Adequate02-32 3ALD 208.0 SCCR10 10,000 8,628 2.223 Adequate 02-33 3AHA 480.0 FD/C-H 35,000 15,437 1.499 Adequate

02-34 MCC MAB 480.0 SCCR22 22,000 17,974 3.368 Adequate 02-35 ATS-D4AH 480.0 SCCR35 35,000 18,457 3.460 Adequate

02-36 D4AH 480.0 SCCR50 50,000 17,922 3.359 Adequate 02-37 D4AL 208.0 SCCR50 50,000 8,909 3.177 Adequate 02-38 4ALA 208.0 SCCR10 10,000 7,504 1.691 Adequate 02-39 4ALB 208.0 SCCR10 10,000 7,437 1.655 Adequate 02-40 4ALC 208.0 SCCR10 10,000 7,371 1.620 Adequate 02-41 4ALD 208.0 SCCR10 10,000 7,110 1.498 Adequate 02-42 4AHA 480.0 FD/C-H 35,000 14,112 1.484 Adequate

02-43 SW 4CA 480.0 DJ 65,000 24,614 5.099 Adequate 02-44 SW 4EA 480.0 DG 35,000 23,570 4.075 Adequate 03-00 MDBI 480.0 DS-632 65,000 26,877 6.822 Adequate

03-01 HXRP-B 480.0 SCCR50 50,000 14,210 2.310 Adequate 03 02 ENCL C/B 480 0 KA 25 000 2 365 2 341 Ad t03-02 ENCL C/B 480.0 KA 25,000 2,365 2.341 Adequate

03-03 XRAY RM 4 480.0 SCCR10 10,000 2,514 2.276 Adequate 03-04 RAD FL 7 480.0 SCCR10 10,000 7,385 0.816 Adequate 03-05 RAD FL 6 480.0 SCCR10 10,000 9,143 1.168 Adequate

#N/A = Number not available.

SCET Page 2 of 18

POWER SYSTEM ENGINEERING Q2C #37151901

SHORT-CIRCUIT

EVALUATION TABLE

EQUIP. DESCRIPTION LOWEST RATED DEVICE MAXIMUM LINE SIDE LINE SIDE

BUS PER SYSTEM ONE NOMINAL IN EQUIPMENT ENCLOSURE AVAILABLE X/R MAXIMUM SERIES NOTES NO. LINE DIAGRAM(S) L-L VOLTS TYPE AIC OR WCR SCA OR DUTY RATIO DEVICE RATING EVALUATION #

03-06 ENCL C/B 480.0 KA 25,000 2,365 2.341 Adequate 03-07 RAD #3 480.0 SCCR10 10,000 2,502 2.261 Adequate

03-08 A-CHEST #2 480.0 #N/A 10,685 1.392 #N/A,

03-09 A-RAD #1 480.0 #N/A 12,646 1.796 #N/A

03-10 D1IH 480.0 SCCR50 50,000 25,015 5.195 Adequate 03-11 D1IL 208.0 SCCR50 50,000 12,817 3.928 Adequate

03-12 1ILC 208.0 SCCR10 10,000 13,115 2.731 INADEQUATE

03-13 1ILB 208.0 SCCR10 10,000 13,274 2.784 INADEQUATE

03-14 1ILA 208.0 SCCR10 10,000 13,031 2.637 INADEQUATE

03-15 1ILD 208.0 SCCR10 10,000 12,497 2.463 INADEQUATE

03-16 PHONE RM 208.0 SCCR10 10,000 6,489 0.891 Adequate

03-17 ILE 208.0 SCCR10 10,000 10,017 1.580 INADEQUATE

03-18 1IHA 480.0 FD/C-H 35,000 21,279 2.744 Adequate 03-19 RAD #14 480.0 FA 18,000 13,058 1.740 Adequate

03-20 MCC MIA 480.0 SCCR65 65,000 22,150 3.997 Adequate 03-21 AH-14 480.0 SCCR10 10,000 6,842 0.440 Adequate 03-22 AH-22 480.0 SCCR10 10,000 4,800 0.338 Adequate 03-23 AH-30 480 0 SCCR10 10 000 3 549 0 279 Adequate03-23 AH-30 480.0 SCCR10 10,000 3,549 0.279 Adequate 03-24 D2IH 480.0 SCCR50 50,000 21,024 3.628 Adequate 03-25 D2IL 208.0 SCCR50 50,000 7,499 3.107 Adequate 03-26 2ILA 208.0 SCCR10 10,000 7,579 2.450 Adequate 03-27 2ILB 208.0 SCCR10 10,000 7,320 2.282 Adequate 03-28 2IHA 480.0 EHD/C-H 14,000 17,288 1.834 SERIES RTNG 35 35,000 Adequate 03-29 D3IH 480.0 SCCR50 50,000 19,721 3.276 Adequate 03-30 D3IL 208.0 SCCR50 50,000 9,046 3.132 Adequate

03-31 ENCL C/B 208.0 KH 65,000 2,849 0.500 Adequate 03-32 XRP #1 208.0 SCCR10 10,000 2,186 0.419 Adequate

03-33 3ILC 208.0 SCCR10 10,000 6,988 1.345 Adequate 03-34 3ILB 208.0 SCCR10 10,000 8,394 2.126 Adequate 03-35 3ILA 208.0 SCCR10 10,000 9,019 2.465 Adequate 03-36 3IHA 480.0 FD/C-H 35,000 16,656 1.899 Adequate 03-37 D4IH 480.0 SCCR50 50,000 19,319 3.181 Adequate 03 38 D4IL 208 0 SCCR50 50 000 7 392 3 053 Ad t03-38 D4IL 208.0 SCCR50 50,000 7,392 3.053 Adequate 03-39 4ILC 208.0 SCCR10 10,000 6,157 1.566 Adequate 03-40 4ILB 208.0 SCCR10 10,000 7,455 2.424 Adequate 03-41 4ILA 208.0 SCCR10 10,000 7,320 2.316 Adequate

#N/A = Number not available.

SCET Page 3 of 18

POWER SYSTEM ENGINEERING Q2C #37151901

SHORT-CIRCUIT

EVALUATION TABLE

EQUIP. DESCRIPTION LOWEST RATED DEVICE MAXIMUM LINE SIDE LINE SIDE

BUS PER SYSTEM ONE NOMINAL IN EQUIPMENT ENCLOSURE AVAILABLE X/R MAXIMUM SERIES NOTES NO. LINE DIAGRAM(S) L-L VOLTS TYPE AIC OR WCR SCA OR DUTY RATIO DEVICE RATING EVALUATION #

03-42 4IP 208.0 QO 10,000 1,354 0.297 Adequate 03-43 4IHA 480.0 FD/C-H 35,000 16,254 1.858 Adequate

03-44 C. RM WIRE 480.0 SCCR10 10,000 9,326 1.323 AdequateSCCR10 , , q 03-45 ENCL C/B 480.0 EHD/C-H 14,000 9,121 1.276 Adequate

03-46 UNIT A 480.0 SCCR10 10,000 8,730 1.194 Adequate 03-47 ENCL C/B 480.0 EHD/C-H 14,000 8,923 1.233 Adequate

03-48 UNIT B 480.0 SCCR10 10,000 8,364 1.124 Adequate 03-49 ENCL C/B 480.0 EHD/C-H 14,000 8,092 1.012 Adequate

03-50 UNIT C 480.0 SCCR10 10,000 6,765 0.782 Adequate 03-51A ARRAY #1 DS 480.0 SCCR10 10,000 6,004 0.913 Adequate

03-51B ARRAY #1 INVERTER 480.0 SCCR10 10,000 5,799 0.907 Adequate 03-52 SW-4CI 480.0 DJ 65,000 27,328 6.206 Adequate 03-53 SW-4EI 480.0 DG 35,000 25,127 4.669 Adequate 04-00 US3B 480.0 DS-632 65,000 30,323 7.314 Adequate

04-01 MDBU 480.0 SCCR65 65,000 28,894 6.023 Adequate 04-02 D1UH 480.0 SCCR50 50,000 25,740 4.519 Adequate 04-03 D1UL 208.0 SCCR50 50,000 9,655 3.392 Adequate 04-04 1ULA 208 0 SCCR10 10 000 9 850 2 525 Adequate04-04 1ULA 208.0 SCCR10 10,000 9,850 2.525 Adequate 04-05 1ULB 208.0 SCCR10 10,000 8,658 1.914 Adequate 04-06 1ULC 208.0 SCCR10 10,000 9,641 2.440 Adequate 04-07 1ULD 208.0 SCCR10 10,000 9,201 2.217 Adequate

04-08 1SW-LA 208.0 SCCR10 10,000 6,975 2.461 Adequate 04-09 1SW-LB 208.0 SCCR10 10,000 6,793 2.431 Adequate 04-10 1UHA 480.0 FD/C-H 35,000 19,592 1.494 Adequate

04-11 BUH 480.0 SCCR14 14,000 16,063 1.144 INADEQUATE

04-12 1SW/HA 480.0 HFD 65,000 14,150 1.574 Adequate 04-13 MCC MUA 480.0 SCCR65 65,000 24,907 4.010 Adequate

04-14 AH-4 480.0 SCCR10 10,000 8,358 0.455 Adequate

04-15 AH-1 480.0 #N/A 10,420 0.559 #N/A

04-16 AH-12 480.0 SCCR10 10,000 5,887 0.343 Adequate 04-17 AH-20 480.0 SCCR10 10,000 8,553 0.532 Adequate 04-18 AH-28 480.0 SCCR10 10,000 4,325 0.277 Adequate 04 19 D2UH 480 0 SCCR50 50 000 24 109 3 744 Ad t04-19 D2UH 480.0 SCCR50 50,000 24,109 3.744 Adequate 04-20 D2UL 208.0 SCCR50 50,000 7,801 3.213 Adequate 04-21 2ULA 208.0 SCCR10 10,000 7,887 2.397 Adequate 04-22 2ULB 208.0 SCCR10 10,000 7,806 2.356 Adequate

#N/A = Number not available.

SCET Page 4 of 18

POWER SYSTEM ENGINEERING Q2C #37151901

SHORT-CIRCUIT

EVALUATION TABLE

EQUIP. DESCRIPTION LOWEST RATED DEVICE MAXIMUM LINE SIDE LINE SIDE

BUS PER SYSTEM ONE NOMINAL IN EQUIPMENT ENCLOSURE AVAILABLE X/R MAXIMUM SERIES NOTES NO. LINE DIAGRAM(S) L-L VOLTS TYPE AIC OR WCR SCA OR DUTY RATIO DEVICE RATING EVALUATION #

04-23 2ULC 208.0 SCCR10 10,000 7,727 2.317 Adequate 04-24 2ULD 208.0 SCCR10 10,000 6,574 1.643 Adequate 04-25 2UHA 480.0 FD/C-H 35,000 19,062 1.547 AdequateFD/C H , , q 04-26 D3UH 480.0 SCCR50 50,000 21,469 3.842 Adequate 04-27 D3UL 208.0 SCCR50 50,000 7,403 3.078 Adequate 04-28 3ULA 208.0 SCCR10 10,000 6,859 2.058 Adequate 04-29 3ULB 208.0 SCCR10 10,000 6,797 2.030 Adequate 04-30 3ULC 208.0 SCCR10 10,000 6,135 1.607 Adequate 04-31 3ULD 208.0 SCCR10 10,000 6,619 1.953 Adequate

04-32A 3ULE 208.0 SCCR10 10,000 1,792 1.900 Adequate 04-32B ATS-3UHA 480.0 SCCR35 35,000 20,318 2.816 Adequate

04-33 3UHA 480.0 FD/C-H 35,000 15,512 1.382 Adequate 04-34 D4UH 480.0 SCCR50 50,000 20,416 3.539 Adequate 04-35 D4UL 208.0 SCCR50 50,000 7,433 3.085 Adequate 04-36 4ULA 208.0 SCCR10 10,000 7,076 2.146 Adequate 04-37 4ULB 208.0 SCCR10 10,000 7,076 2.146 Adequate 04-38 4ULC 208.0 SCCR10 10,000 6,344 1.725 Adequate 04-39 4ULD 208 0 SCCR10 10 000 6 296 1 693 Adequate04-39 4ULD 208.0 SCCR10 10,000 6,296 1.693 Adequate 04-40 4ULE 208.0 SCCR10 10,000 7,885 2.564 Adequate

04-41 MCC MUB 480.0 SCCR25 25,000 6,751 0.784 Adequate 04-42 4UHA 480.0 FD/C-H 35,000 15,579 1.417 Adequate

04-43 ARRAY 7&8 DS 480.0 SCCR25 25,000 13,725 2.765 Adequate 04-44 ARRAY 7&8 ACLC #2 480.0 SCCR25 25,000 13,546 2.797 Adequate

04-45 ARRAY #7 INVT 480.0 SCCR25 25,000 13,198 2.859 Adequate 04-46 ARRAY #8 INVT 480.0 SCCR25 25,000 12,773 2.280 Adequate

04-47 2500A MDS 480.0 SCCR65 65,000 21,226 3.561 Adequate 04-48 1600A MDS 480.0 SCCR65 65,000 21,172 3.541 Adequate

04-49 1NDHA1 480.0 HFD 65,000 17,125 2.302 Adequate 04-50 T-1 CB ENCLOSURE 480.0 SFL(3P) 65,000 17,125 2.302 Adequate

04-51 1NDLA1 208.0 HFD 100,000 7,125 3.027 Adequate 04-52 1NPLA1 208.0 BA 10,000 6,789 2.177 Adequate 04-53 1NPLA2 208.0 BA 10,000 5,512 1.535 Adequate 04 54 2NPLA1 208 0 BA 10 000 6 493 2 044 Ad t04-54 2NPLA1 208.0 BA 10,000 6,493 2.044 Adequate 04-55 3NPLA1 208.0 BA 10,000 5,587 1.668 Adequate 04-56 1NPHA1 480.0 HFD 65,000 17,510 2.382 Adequate 04-57 2NPHA1 480.0 FD/C-H 35,000 14,612 1.580 Adequate

#N/A = Number not available.

SCET Page 5 of 18

POWER SYSTEM ENGINEERING Q2C #37151901

SHORT-CIRCUIT

EVALUATION TABLE

EQUIP. DESCRIPTION LOWEST RATED DEVICE MAXIMUM LINE SIDE LINE SIDE

BUS PER SYSTEM ONE NOMINAL IN EQUIPMENT ENCLOSURE AVAILABLE X/R MAXIMUM SERIES NOTES NO. LINE DIAGRAM(S) L-L VOLTS TYPE AIC OR WCR SCA OR DUTY RATIO DEVICE RATING EVALUATION #

04-58 AC-1 DS 480.0 SCCR200 200,000 12,845 1.660 Adequate 04-59 SW-4CU 480.0 DJ 65,000 27,651 5.534 Adequate 04-60 SW-4EU 480.0 DG 35,000 25,611 3.567 AdequateDG , , q 05-00 MDBM 480.0 DS-632 65,000 28,462 6.757 Adequate

05-01 HXRP-A 480.0 SCCR100 100,000 17,093 2.570 Adequate

05-02 CT SCAN. 480.0 #N/A 15,960 2.027 #N/A

05-03 CT SCAN. 480.0 #N/A 12,685 1.410 #N/A

05-04 ANGIO RM 480.0 #N/A 11,428 1.238 #N/A

05-05 D1MH 480.0 SCCR50 50,000 27,045 5.578 Adequate 05-06 D1ML 208.0 SCCR50 50,000 13,035 3.973 Adequate

05-07 1MLD 208.0 SCCR10 10,000 12,556 2.401 INADEQUATE

05-08 ALP 208.0 SCCR10 10,000 4,188 0.848 Adequate

05-09 1MLC 208.0 SCCR10 10,000 12,164 2.219 INADEQUATE

05-10 1MLB 208.0 SCCR10 10,000 12,904 2.510 INADEQUATE

05-11 1MLA 208.0 SCCR10 10,000 12,904 2.510 INADEQUATE

05-12 1MHA 480.0 FD/C-H 35,000 22,327 2.352 Adequate

05-13 D1HE 480.0 GHB/C-H 14,000 21,994 2.250 INADEQUATE

05-14 DPMHA 480 0 SCCR65 65 000 17 387 3 373 Adequate05-14 DPMHA 480.0 SCCR65 65,000 17,387 3.373 Adequate

05-15 SB5 DSW 480.0 #N/A 17,121 3.269 #N/A

05-16 SB5 INVT 480.0 #N/A 16,124 2.938 #N/A

05-17 400A SW 480.0 SCCR25 25,000 17,100 3.333 Adequate

05-18 DPMBH 480.0 #N/A 15,509 2.597 #N/A

05-19 MCC MMA 480.0 SCCR65 65,000 23,977 4.645 Adequate

05-20 AH-5 480.0 #N/A 12,094 0.693 #N/A

05-21 AH-13 480.0 SCCR10 10,000 9,113 0.515 Adequate 05-22 AH-21 480.0 SCCR10 10,000 4,628 0.299 Adequate 05-23 AH-29 480.0 SCCR10 10,000 5,188 0.324 Adequate 05-24 D2MH 480.0 SCCR50 50,000 25,226 4.228 Adequate 05-25 D2ML 208.0 SCCR50 50,000 12,780 3.749 Adequate 05-26 2MLC 208.0 SCCR10 10,000 9,251 1.247 Adequate

05-27 2MLB 208.0 SCCR10 10,000 11,723 2.215 INADEQUATE

05-28 PMR-B 208.0 SCCR10 10,000 2,967 0.415 Adequate 05 29 PMR A 208 0 SCCR10 10 000 6 642 1 194 Ad t05-29 PMR-A 208.0 SCCR10 10,000 6,642 1.194 Adequate

05-30 2MLA 208.0 SCCR10 10,000 12,030 2.301 INADEQUATE

05-31 2MHA 480.0 FD/C-H 35,000 21,510 2.168 Adequate 05-32 DPMH 480.0 SCCR50 50,000 14,480 1.475 Adequate

#N/A = Number not available.

SCET Page 6 of 18

POWER SYSTEM ENGINEERING Q2C #37151901

SHORT-CIRCUIT

EVALUATION TABLE

EQUIP. DESCRIPTION LOWEST RATED DEVICE MAXIMUM LINE SIDE LINE SIDE

BUS PER SYSTEM ONE NOMINAL IN EQUIPMENT ENCLOSURE AVAILABLE X/R MAXIMUM SERIES NOTES NO. LINE DIAGRAM(S) L-L VOLTS TYPE AIC OR WCR SCA OR DUTY RATIO DEVICE RATING EVALUATION #

05-33 ELEV P-1 480.0 #N/A 11,741 1.025 #N/A

05-34 ELEV. P-2 480.0 #N/A 10,554 0.890 #N/A

05-35 ELEV. P-3 480.0 #N/A 10,974 0.978 #N/A,

05-36 D3MH 480.0 SCCR50 50,000 23,986 3.682 Adequate 05-37 3MHA 480.0 EHD/C-H 14,000 19,637 1.862 SERIES RTNG 35 35,000 Adequate 05-38 D3ML 208.0 SCCR50 50,000 9,379 3.185 Adequate 05-39 3MLB 208.0 SCCR10 10,000 8,913 2.271 Adequate 05-40 3MLC 208.0 SCCR10 10,000 7,677 1.652 Adequate 05-41 3MLA 208.0 SCCR10 10,000 8,913 2.271 Adequate 05-42 UPS 208.0 SCCR10 10,000 7,325 1.701 Adequate

05-43 UPS-SB5 208.0 SCCR10 10,000 5,533 1.064 Adequate 05-44 M1 480.0 SCCR14 14,000 13,049 1.035 Adequate

05-45 3MHB 480.0 FD/C-H 35,000 18,627 1.693 Adequate 05-46 D4MH 480.0 SCCR50 50,000 22,915 3.319 Adequate 05-47 D4ML 208.0 SCCR50 50,000 9,158 3.189 Adequate 05-48 4MLC 208.0 SCCR10 10,000 8,608 2.238 Adequate 05-49 4MLB 208.0 SCCR10 10,000 8,146 1.960 Adequate 05-50 4MLA 208 0 SCCR10 10 000 8 146 1 960 Adequate05-50 4MLA 208.0 SCCR10 10,000 8,146 1.960 Adequate 05-51 PNL A 208.0 SCCR10 10,000 1,389 0.251 Adequate 05-52 4MLD 208.0 SCCR10 10,000 5,211 0.768 Adequate 05-53 4MHA 480.0 EHD/C-H 14,000 18,839 1.802 SERIES RTNG 35 35,000 Adequate

05-54 MCC MMB 480.0 SCCR25 25,000 10,293 0.858 Adequate 05-55 MCC MMC 480.0 SCCR22 22,000 4,587 0.547 Adequate

05-56 SW-4CM 480.0 DJ 65,000 28,867 6.121 Adequate 05-57 SW-4EM 480.0 DG 35,000 26,552 4.557 Adequate

06-00 US-4B 480.0 DS-632 65,000 27,615 7.449 Adequate 06-01 MDBX 480.0 SCCR65 65,000 26,378 6.080 Adequate 06-02 D1XH 480.0 SCCR50 50,000 22,550 4.783 Adequate 06-03 D1XL 208.0 SCCR50 50,000 9,206 3.248 Adequate 06-04 1XLA 208.0 SCCR10 10,000 8,298 2.010 Adequate 06-05 1XLB 208.0 SCCR10 10,000 7,300 1.490 Adequate 06-06 1XLC 208.0 SCCR10 10,000 7,708 1.811 Adequate 06 07 KLC 208 0 SCCR10 10 000 7 990 2 114 Ad t06-07 KLC 208.0 SCCR10 10,000 7,990 2.114 Adequate

06-08 BXH 480.0 SCCR14 14,000 14,706 1.152 INADEQUATE

06-09 1XHA 480.0 EHD/C-H 14,000 12,971 0.920 Adequate 06-10 MCC MXA 480.0 SCCR65 65,000 24,011 5.073 Adequate

#N/A = Number not available.

SCET Page 7 of 18

POWER SYSTEM ENGINEERING Q2C #37151901

SHORT-CIRCUIT

EVALUATION TABLE

EQUIP. DESCRIPTION LOWEST RATED DEVICE MAXIMUM LINE SIDE LINE SIDE

BUS PER SYSTEM ONE NOMINAL IN EQUIPMENT ENCLOSURE AVAILABLE X/R MAXIMUM SERIES NOTES NO. LINE DIAGRAM(S) L-L VOLTS TYPE AIC OR WCR SCA OR DUTY RATIO DEVICE RATING EVALUATION #

06-11 AH-11 480.0 SCCR10 10,000 5,989 0.380 Adequate 06-12 AH-19 480.0 SCCR10 10,000 9,572 0.565 Adequate 06-13 AH-27 480.0 SCCR10 10,000 7,546 0.456 AdequateSCCR10 , , q 06-14 AH-35 480.0 SCCR10 10,000 6,204 0.391 Adequate 06-15 D2XH 480.0 SCCR50 50,000 21,045 4.269 Adequate 06-16 D2XL 208.0 SCCR50 50,000 9,224 3.308 Adequate 06-17 2XLA 208.0 SCCR10 10,000 8,603 2.030 Adequate 06-18 2XLB 208.0 SCCR10 10,000 8,929 2.255 Adequate 06-19 2XLC 208.0 SCCR10 10,000 8,625 2.136 Adequate 06-20 2XLD 208.0 SCCR10 10,000 9,013 2.395 Adequate 06-21 2XHA 480.0 FD/C-H 35,000 15,023 1.308 Adequate 06-22 D3XH 480.0 SCCR50 50,000 19,719 3.899 Adequate 06-23 D3XL 208.0 SCCR50 50,000 9,091 3.256 Adequate 06-24 3XLA 208.0 SCCR10 10,000 8,207 1.915 Adequate 06-25 3XLB 208.0 SCCR10 10,000 7,831 1.777 Adequate 06-26 3XLC 208.0 SCCR10 10,000 8,312 2.054 Adequate 06-27 3XLD 208.0 SCCR10 10,000 8,419 2.149 Adequate 06-28 3XLE 208 0 EHD/C H 18 000 8 359 2 207 Adequate06-28 3XLE 208.0 EHD/C-H 18,000 8,359 2.207 Adequate 06-29 3XHA 480.0 FD/C-H 35,000 14,071 1.284 Adequate 06-30 D4XH 480.0 SCCR50 50,000 18,543 3.620 Adequate 06-31 D4XL 208.0 SCCR50 50,000 11,755 3.598 Adequate

06-32 4XLA 208.0 SCCR10 10,000 10,667 2.024 INADEQUATE

06-33 4XLB 208.0 SCCR10 10,000 11,187 2.311 INADEQUATE

06-34 4XLC 208.0 SCCR10 10,000 10,262 1.975 INADEQUATE

06-35 4XLD 208.0 SCCR10 10,000 11,348 2.502 INADEQUATE

06-36 4XHA 480.0 EHD/C-H 14,000 13,653 1.333 Adequate

06-37 PS (Parking Structure) 480.0 SED(3P) 18,000 10,648 1.910 Adequate 06-38 PNL L 480.0 SCCR14 14,000 10,346 1.803 Adequate

06-39 SW-4CX 480.0 DJ 65,000 25,340 5.622 Adequate 06-40 SW-4EX 480.0 DG 35,000 23,785 4.390 Adequate 07-00 MDBP 480.0 DS-632 65,000 28,181 6.983 Adequate

07-01 MCC-DPPH 480.0 SCCR50 50,000 8,235 1.787 Adequate 07 02 ELEV T 4 480 0 SCCR10 10 000 3 754 0 475 Ad t07-02 ELEV. T-4 480.0 SCCR10 10,000 3,754 0.475 Adequate 07-03 ELEV. S-8 480.0 SCCR10 10,000 6,794 1.211 Adequate 07-04 ELEV. S-7 480.0 SCCR10 10,000 7,158 1.312 Adequate 07-05 ELEV. S-6 480.0 SCCR10 10,000 7,526 1.444 Adequate

#N/A = Number not available.

SCET Page 8 of 18

POWER SYSTEM ENGINEERING Q2C #37151901

SHORT-CIRCUIT

EVALUATION TABLE

EQUIP. DESCRIPTION LOWEST RATED DEVICE MAXIMUM LINE SIDE LINE SIDE

BUS PER SYSTEM ONE NOMINAL IN EQUIPMENT ENCLOSURE AVAILABLE X/R MAXIMUM SERIES NOTES NO. LINE DIAGRAM(S) L-L VOLTS TYPE AIC OR WCR SCA OR DUTY RATIO DEVICE RATING EVALUATION #

07-06 D1PH 480.0 SCCR50 50,000 28,061 6.192 Adequate 07-07 D1PL 208.0 SCCR50 50,000 12,043 4.080 Adequate

07-08 K 208.0 SCCR50 50,000 8,109 2.790 AdequateSCCR50 , , q 07-09 KLB 208.0 SCCR10 10,000 8,389 2.383 Adequate

07-10 GRIDDLE TRAY 208.0 SCCR14 14,000 5,191 1.034 Adequate 07-11 KLA 208.0 SCCR10 10,000 7,889 2.138 Adequate

07-12 K461 DIST1 208.0 SCCR10 10,000 5,059 1.037 Adequate 07-13 K461 DIST2 208.0 SCCR10 10,000 3,215 0.589 Adequate

07-14 K441A TRAY 208.0 SCCR10 10,000 6,442 2.002 Adequate 07-15 PNL SWR 208.0 SCCR10 10,000 8,414 2.369 Adequate 07-16 5PD LA 208.0 SCCR10 10,000 5,180 1.341 Adequate 07-17 SPDLB 208.0 SCCR10 10,000 4,752 1.279 Adequate

07-18 1PLA 208.0 SCCR10 10,000 10,386 1.999 INADEQUATE

07-19 1PLB 208.0 GHQ/C-H 65,000 11,449 3.466 Adequate

07-20 1PHA 480.0 SCCR14 14,000 18,949 1.592 INADEQUATE

07-21 KHA 480.0 SCCR14 14,000 12,775 2.104 Adequate

07-22 SPD HA 480.0 SCCR14 14,000 10,133 1.142 Adequate 07-23 MCC MPA 480 0 SCCR65 65 000 25 228 5 232 Adequate07-23 MCC MPA 480.0 SCCR65 65,000 25,228 5.232 Adequate

07-24 AH-18 480.0 #N/A 10,536 0.596 #N/A

07-25 AH-26 480.0 SCCR10 10,000 9,407 0.587 Adequate 07-26 AH-34 480.0 SCCR10 10,000 5,776 0.360 Adequate 07-27 D2PH 480.0 SCCR50 50,000 25,006 4.843 Adequate 07-28 D2PL 208.0 SCCR50 50,000 12,041 4.039 Adequate 07-29 2PLE 208.0 GHQ/C-H 65,000 11,027 2.886 Adequate 07-30 2PLD 208.0 GHQ/C-H 65,000 10,518 2.673 Adequate 07-31 2PLC 208.0 GHQ/C-H 65,000 10,798 2.999 Adequate 07-32 2PLB 208.0 GHQ/C-H 65,000 10,935 2.944 Adequate 07-33 2PLA 208.0 GHQ/C-H 65,000 11,120 3.083 Adequate 07-34 2PHA 480.0 EHD/C-H 14,000 15,267 0.996 SERIES RTNG 35 35,000 Adequate

07-35 2PLG DISC. 208.0 SCCR10 10,000 6,621 2.847 Adequate 07-36 2PLF 208.0 SCCR10 10,000 6,430 2.738 Adequate 07-37 2PLG 208.0 SCCR10 10,000 6,430 2.738 Adequate 07 38 D3PH 480 0 SCCR50 50 000 23 992 4 375 Ad t07-38 D3PH 480.0 SCCR50 50,000 23,992 4.375 Adequate 07-39 D3PL 208.0 SCCR50 50,000 9,436 3.294 Adequate 07-40 3PLC 208.0 SCCR10 10,000 9,097 2.346 Adequate 07-41 3PLB 208.0 SCCR10 10,000 9,029 2.263 Adequate

#N/A = Number not available.

SCET Page 9 of 18

POWER SYSTEM ENGINEERING Q2C #37151901

SHORT-CIRCUIT

EVALUATION TABLE

EQUIP. DESCRIPTION LOWEST RATED DEVICE MAXIMUM LINE SIDE LINE SIDE

BUS PER SYSTEM ONE NOMINAL IN EQUIPMENT ENCLOSURE AVAILABLE X/R MAXIMUM SERIES NOTES NO. LINE DIAGRAM(S) L-L VOLTS TYPE AIC OR WCR SCA OR DUTY RATIO DEVICE RATING EVALUATION #

07-42 3PLA 208.0 SCCR10 10,000 8,192 1.804 Adequate 07-43 3PHA 480.0 FD/C-H 35,000 15,874 1.162 Adequate 07-44 D4PH 480.0 SCCR50 50,000 24,114 4.721 AdequateSCCR50 , , q 07-45 D4PL 208.0 SCCR50 50,000 12,577 3.806 Adequate

07-46 4PLA 208.0 SCCR10 10,000 11,898 2.265 INADEQUATE

07-47 4PLB 208.0 SCCR10 10,000 12,393 2.549 INADEQUATE

07-48 4PLC 208.0 SCCR10 10,000 11,988 2.428 INADEQUATE

07-49 4PLD 208.0 SCCR10 10,000 10,428 1.861 INADEQUATE

07-50…