ARC Testing Report.pdf

LCERONE

537-15-141, Short Circuit Coordination Study Submitted by Kelso-Burnett Co.

Power System Engineering

June 2017

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

1.3 Study Recommendations

1.3.1 Priority Improvements

1.3.2 Study Recommendation Tables

1.4 Study Highlights

1.4.1 Short-Circuit

1.4.2 Coordination

1.4.3 Arc Flash

1.4.4 Other Findings

2 INTRODUCTION

3 STUDY DATA

3.1 Importance

3.2 Missing Data

3.3 Estimates & Assumptions

4 SHORT-CIRCUIT ANALYSIS

4.1 General Procedure

4.2 Data Used in the Calculations

4.2.1 Power Company Data

4.2.2 Cable Data

4.2.3 Transformer Data

4.2.4 Motor Contribution to Short-Circuit Current

4.3 Short-Circuit Analysis Results

4.4 Short-Circuit Evaluation Table

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 Low-Voltage Ground-Fault Relay Settings

5.2.4 Transformer Protective Devices

5.2.5 Cable Protection

5.2.6 Selective Coordination and the National Electric Code

5.3 Analysis of Results

5.4 Overcurrent Device Setting Tables

5.5 Time-Current Coordination Graphs

6 ARC FLASH HAZARD ANALYSIS

6.1 General Procedure

6.2 Specific Procedure

6.3 AF Hazard Analysis Results

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 – Recommended 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 Jesse Brown VA Medical Center in Chicago, IL. 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. Unless specifically required by job specifications, branch circuit utilization equipment, as defined per NEC Article 100, was not included in this study (this may consist of small equipment, 100A and less, such as:

safety switches, industrial control panels, and enclosed starters/drives).

Notes:

1. Substations S3N-3-1, S3N-3-2, and S3N-P-1 were not included in the Arc Flash analysis. The upstream relay CT information could not be obtained at HVSN-3-1.

Once CT information is provided these substations can be included in the analysis.

2. Numerous NEC 240 violations, cables not protected, appear within the system.

It is beyond the scope of this study to review and document these NEC violations.

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.

1.3 Study Recommendations

1.3.1 Priority Improvements

Arc Flash Recommendations

1. See Arc Flash Recommendations Table.

Refer to the Study Recommendation Tables section.

Reducing arc flash incident energy hazard levels improves personnel protection.

Short-Circuit Recommendations

1. See Short-Circuit Evaluation Table for recommendations.

Refer to the Study Recommendation Tables section.

It’s vital for equipment to withstand or to interrupt fault currents to comply with the NEC, reduce excessive damage, reduce fire hazards, & improve safety.

Site / NEC / Other Recommendations

1. Numerous NEC 240 violations, cables not protected, exist within the system. It is beyond the scope of this study to review and document each NEC violation.

All equipment should be installed to meet local NEC requirements and be properly maintained to prevent premature failure and outages.

Coordination Recommendations

1. Miscoordination between devices 100-02 ATS-1 FDR and 103-01 PE-1 Main on 02.TCC. Informative only.

Refer to the Study Recommendation Tables section.

A well-coordinated system maximizes electrical service continuity while attempting to minimize arc flash incident energy.

1.3.2 Study Recommendation Tables

JESSE BROWN VA MEDICAL CENTER

CHICAGO, IL

POWER SYSTEM ENGINEERING Q2C# 39381338

016 CH‐1 MCC 4160.0 #N/A 1‐SHORT‐CIRCUIT AIC OR WCR IS UNKNOWN.

018 CH‐2 MCC 4160.0 #N/A 1‐SHORT‐CIRCUIT AIC OR WCR IS UNKNOWN.

021 CH‐3 MCC 4160.0 #N/A 1‐SHORT‐CIRCUIT AIC OR WCR IS UNKNOWN.

102 PE‐1A 208.0 #N/A 1‐SHORT‐CIRCUIT AIC OR WCR IS UNKNOWN.

103 PE‐1 208.0 INADEQUATE 1‐SHORT‐CIRCUIT AIC OR WCR IS UNKNOWN.

108 GTT 208.0 #N/A 1‐SHORT‐CIRCUIT AIC OR WCR IS UNKNOWN.

111 SERVICE LINE 208.0 #N/A 1‐SHORT‐CIRCUIT AIC OR WCR IS UNKNOWN.

116 2K2 208.0 #N/A 1‐SHORT‐CIRCUIT AIC OR WCR IS UNKNOWN.

119 GB1 208.0 #N/A 1‐SHORT‐CIRCUIT AIC OR WCR IS UNKNOWN.

120 GB 208.0 INADEQUATE 3 ‐ CHANGE QOB BREAKERS TO QOB‐VH BREAKERS.

120 GB 208.0 INADEQUATE 7 ‐ CHANGE Q2 BREAKER TO QD BREAKER.

124 1BL 208.0 INADEQUATE 3 ‐ CHANGE QOB BREAKERS TO QOB‐VH BREAKERS.

198 GE1‐1 208.0 #N/A 1‐SHORT‐CIRCUIT AIC OR WCR IS UNKNOWN.

227 4A2 208.0 #N/A 1‐SHORT‐CIRCUIT AIC OR WCR IS UNKNOWN.

254 1C 208.0 #N/A 1‐SHORT‐CIRCUIT AIC OR WCR IS UNKNOWN.

276 LPB1/B2 480.0 INADEQUATE 4 ‐ CHANGE EDB BREAKERS TO EGB BREAKERS.

277 LPA1/A2 480.0 INADEQUATE 4 ‐ CHANGE EDB BREAKERS TO EGB BREAKERS.

302 LDP1‐1 208.0 INADEQUATE 3 ‐ CHANGE QOB BREAKERS TO QOB‐VH BREAKERS.

302 LDP1‐1 208.0 INADEQUATE 5 ‐ CHANGE QB BREAKER TO QD BREAKER.

303 LP1‐1A 480.0 INADEQUATE 4 ‐ CHANGE EDB BREAKERS TO EGB BREAKERS.

305 PP‐1 480.0 INADEQUATE 4 ‐ CHANGE EDB BREAKERS TO EGB BREAKERS.

312 ATS 480.0 #N/A 1‐SHORT‐CIRCUIT AIC OR WCR IS UNKNOWN.

319 H1 480.0 INADEQUATE 2 ‐ CHANGE EQUIPMENT RATED GREATER THAN MAX. FAULT CURRENT.

337 DPCP 208.0 INADEQUATE 2 ‐ CHANGE EQUIPMENT RATED GREATER THAN MAX. FAULT CURRENT.

342 GCA 208.0 #N/A 1‐SHORT‐CIRCUIT AIC OR WCR IS UNKNOWN.

368 GD‐L 208.0 INADEQUATE 2 ‐ CHANGE EQUIPMENT RATED GREATER THAN MAX. FAULT CURRENT.

369 GD‐R 208.0 INADEQUATE 2 ‐ CHANGE EQUIPMENT RATED GREATER THAN MAX. FAULT CURRENT.

SHORT‐CIRCUIT RECOMMENDATIONS TABLE

Bus No.

Equipment Designation Volts RecommendationsGeneral Issue

#N/A = Number not available.

SCIET Page 1 of 4 [Form Ver. 3.13]

POWER SYSTEM ENGINEERING Q2C# 39381338

SHORT‐CIRCUIT RECOMMENDATIONS TABLE

Bus No.

Equipment Designation Volts RecommendationsGeneral Issue

382 DPD 208.0 INADEQUATE 2 ‐ CHANGE EQUIPMENT RATED GREATER THAN MAX. FAULT CURRENT.

383 A 208.0 INADEQUATE 2 ‐ CHANGE EQUIPMENT RATED GREATER THAN MAX. FAULT CURRENT.

386 CD 208.0 INADEQUATE 2 ‐ CHANGE EQUIPMENT RATED GREATER THAN MAX. FAULT CURRENT.

388 ED 208.0 INADEQUATE 2 ‐ CHANGE EQUIPMENT RATED GREATER THAN MAX. FAULT CURRENT.

393 JD 208.0 INADEQUATE 2 ‐ CHANGE EQUIPMENT RATED GREATER THAN MAX. FAULT CURRENT.

398 3FA 208.0 INADEQUATE 3 ‐ CHANGE QOB BREAKERS TO QOB‐VH BREAKERS.

398 3FA 208.0 INADEQUATE 7 ‐ CHANGE Q2 BREAKER TO QD BREAKER.

450 4CA 208.0 #N/A 1‐SHORT‐CIRCUIT AIC OR WCR IS UNKNOWN.

469 GB‐2 208.0 INADEQUATE 3 ‐ CHANGE QOB BREAKERS TO QOB‐VH BREAKERS.

504 8PPHA 480.0 INADEQUATE 2 ‐ CHANGE EQUIPMENT RATED GREATER THAN MAX. FAULT CURRENT.

513 8PPHB 480.0 INADEQUATE 2 ‐ CHANGE EQUIPMENT RATED GREATER THAN MAX. FAULT CURRENT.

520 MCC‐PHA 480.0 INADEQUATE 2 ‐ CHANGE EQUIPMENT RATED GREATER THAN MAX. FAULT CURRENT.

525 MCC‐PHBB1 480.0 INADEQUATE 2 ‐ CHANGE EQUIPMENT RATED GREATER THAN MAX. FAULT CURRENT.

537 FIRE PUMP 480.0 #N/A 1‐SHORT‐CIRCUIT AIC OR WCR IS UNKNOWN.

538 11PPHA 480.0 INADEQUATE 2 ‐ CHANGE EQUIPMENT RATED GREATER THAN MAX. FAULT CURRENT.

541 MCC‐PHC 480.0 INADEQUATE 2 ‐ CHANGE EQUIPMENT RATED GREATER THAN MAX. FAULT CURRENT.

542 MCC‐PHK 480.0 INADEQUATE 2 ‐ CHANGE EQUIPMENT RATED GREATER THAN MAX. FAULT CURRENT.

560 HGL1 480.0 #N/A 1‐SHORT‐CIRCUIT AIC OR WCR IS UNKNOWN.

563 MRI BLDG 480.0 #N/A 1‐SHORT‐CIRCUIT AIC OR WCR IS UNKNOWN.

581 COMP PNL 208.0 INADEQUATE 3 ‐ CHANGE QOB BREAKERS TO QOB‐VH BREAKERS.

581 COMP PNL 208.0 INADEQUATE 6 ‐ CHANGE Q2 BREAKER TO QG BREAKER.

639 D3B4 208.0 INADEQUATE 3 ‐ CHANGE QOB BREAKERS TO QOB‐VH BREAKERS.

639 D3B4 208.0 INADEQUATE 7 ‐ CHANGE Q2 BREAKER TO QD BREAKER.

643 D1B1 208.0 INADEQUATE 3 ‐ CHANGE QOB BREAKERS TO QOB‐VH BREAKERS.

666 EBA 208.0 #N/A 1‐SHORT‐CIRCUIT AIC OR WCR IS UNKNOWN.

667 EGV 208.0 #N/A 1‐SHORT‐CIRCUIT AIC OR WCR IS UNKNOWN.

709 2K1 208.0 INADEQUATE 3 ‐ CHANGE QOB BREAKERS TO QOB‐VH BREAKERS.

#N/A = Number not available.

SCIET Page 2 of 4

POWER SYSTEM ENGINEERING Q2C# 39381338

SHORT‐CIRCUIT RECOMMENDATIONS TABLE

Bus No.

Equipment Designation Volts RecommendationsGeneral Issue

710 PDA 208.0 INADEQUATE 2 ‐ CHANGE EQUIPMENT RATED GREATER THAN MAX. FAULT CURRENT.

711 PDA1 208.0 INADEQUATE 2 ‐ CHANGE EQUIPMENT RATED GREATER THAN MAX. FAULT CURRENT.

712 9C 208.0 INADEQUATE 3 ‐ CHANGE QOB BREAKERS TO QOB‐VH BREAKERS.

713 9D 208.0 INADEQUATE 3 ‐ CHANGE QOB BREAKERS TO QOB‐VH BREAKERS.

715 PDA2 208.0 INADEQUATE 3 ‐ CHANGE QOB BREAKERS TO QOB‐VH BREAKERS.

719 1L 208.0 INADEQUATE 2 ‐ CHANGE EQUIPMENT RATED GREATER THAN MAX. FAULT CURRENT.

720 1L1 208.0 INADEQUATE 2 ‐ CHANGE EQUIPMENT RATED GREATER THAN MAX. FAULT CURRENT.

758 C2C 208.0 INADEQUATE 2 ‐ CHANGE EQUIPMENT RATED GREATER THAN MAX. FAULT CURRENT.

759 C2C1 208.0 INADEQUATE 2 ‐ CHANGE EQUIPMENT RATED GREATER THAN MAX. FAULT CURRENT.

759 C2C1 208.0 INADEQUATE 3 ‐ CHANGE QOB BREAKERS TO QOB‐VH BREAKERS.

760 C2C2 208.0 INADEQUATE 2 ‐ CHANGE EQUIPMENT RATED GREATER THAN MAX. FAULT CURRENT.

760 C2C2 208.0 INADEQUATE 7 ‐ CHANGE Q2 BREAKER TO QD BREAKER.

761 C2C3 208.0 INADEQUATE 2 ‐ CHANGE EQUIPMENT RATED GREATER THAN MAX. FAULT CURRENT.

761 C2C3 208.0 INADEQUATE 6 ‐ CHANGE Q2 BREAKER TO QG BREAKER.

763 2L1 208.0 INADEQUATE 3 ‐ CHANGE QOB BREAKERS TO QOB‐VH BREAKERS.

766 5BN 208.0 INADEQUATE 2 ‐ CHANGE EQUIPMENT RATED GREATER THAN MAX. FAULT CURRENT.

768 6BN 208.0 INADEQUATE 2 ‐ CHANGE EQUIPMENT RATED GREATER THAN MAX. FAULT CURRENT.

770 7BN 208.0 INADEQUATE 2 ‐ CHANGE EQUIPMENT RATED GREATER THAN MAX. FAULT CURRENT.

772 8BN 208.0 INADEQUATE 2 ‐ CHANGE EQUIPMENT RATED GREATER THAN MAX. FAULT CURRENT.

789 4TH FLR PN 480.0 #N/A 1‐SHORT‐CIRCUIT AIC OR WCR IS UNKNOWN.

798 BLDG #8 208.0 #N/A 1‐SHORT‐CIRCUIT AIC OR WCR IS UNKNOWN.

807 H5L 480.0 #N/A 1‐SHORT‐CIRCUIT AIC OR WCR IS UNKNOWN.

828 QBA1 208.0 #N/A 1‐SHORT‐CIRCUIT AIC OR WCR IS UNKNOWN.

829 QBA2 208.0 #N/A 1‐SHORT‐CIRCUIT AIC OR WCR IS UNKNOWN.

830 QBA3 208.0 #N/A 1‐SHORT‐CIRCUIT AIC OR WCR IS UNKNOWN.

831 C3L2 208.0 #N/A 1‐SHORT‐CIRCUIT AIC OR WCR IS UNKNOWN.

833 UPS DSC 208.0 #N/A 1‐SHORT‐CIRCUIT AIC OR WCR IS UNKNOWN.

#N/A = Number not available.

SCIET Page 3 of 4

POWER SYSTEM ENGINEERING Q2C# 39381338

SHORT‐CIRCUIT RECOMMENDATIONS TABLE

Bus No.

Equipment Designation Volts RecommendationsGeneral Issue

834 UPS 208.0 #N/A 1‐SHORT‐CIRCUIT AIC OR WCR IS UNKNOWN.

842 6BA 208.0 INADEQUATE 2 ‐ CHANGE EQUIPMENT RATED GREATER THAN MAX. FAULT CURRENT.

844 6CB 208.0 INADEQUATE 2 ‐ CHANGE EQUIPMENT RATED GREATER THAN MAX. FAULT CURRENT.

845 6BB 208.0 INADEQUATE 2 ‐ CHANGE EQUIPMENT RATED GREATER THAN MAX. FAULT CURRENT.

846 6AB 208.0 INADEQUATE 2 ‐ CHANGE EQUIPMENT RATED GREATER THAN MAX. FAULT CURRENT.

852 5L1 208.0 #N/A 1‐SHORT‐CIRCUIT AIC OR WCR IS UNKNOWN.

853 1BL1 208.0 INADEQUATE 3 ‐ CHANGE QOB BREAKERS TO QOB‐VH BREAKERS.

865 4DD 480.0 INADEQUATE 2 ‐ CHANGE EQUIPMENT RATED GREATER THAN MAX. FAULT CURRENT.

873 GKC 480.0 INADEQUATE 2 ‐ CHANGE EQUIPMENT RATED GREATER THAN MAX. FAULT CURRENT.

902 T‐S3N‐3‐1 PRI 4160.0 #N/A 1‐SHORT‐CIRCUIT AIC OR WCR IS UNKNOWN.

903 T‐S3N‐P‐1 PRI 4160.0 #N/A 1‐SHORT‐CIRCUIT AIC OR WCR IS UNKNOWN.

904 T‐S3N‐3‐2 PRI 4160.0 #N/A 1‐SHORT‐CIRCUIT AIC OR WCR IS UNKNOWN.

910 ATS 480.0 #N/A 1‐SHORT‐CIRCUIT AIC OR WCR IS UNKNOWN.

913 LAB1 PDU 480.0 #N/A 1‐SHORT‐CIRCUIT AIC OR WCR IS UNKNOWN.

914 LAB 2 PDU 480.0 #N/A 1‐SHORT‐CIRCUIT AIC OR WCR IS UNKNOWN.

#N/A = Number not available.

SCIET Page 4 of 4

Q2C# 39381338

POWER SYSTEM ENGINEERING BASED ON RECOMMENDED SETTINGS

TCC(s) Equipment Designations / Dwg #

Device # / CB General Issue Recommendations Similar Device Change Recommendations (not shown on a TCC)

02.TCC

100 SUB 8B and 103 PE‐1 /

D‐ML‐04‐359‐2

100‐02 ATS‐1 FDR and

103‐01 PE‐1 MAIN

Overcurrent coordination ‐ overlap in more than one region

None ‐ Informative only.

A similar situation exists for 07.TCC, 023.TCC, 027.TCC, 032.TCC, 035.TCC, 044.TCC, 045.TCC, 046.TCC, 056.TCC, 059.TCC, 061.TCC, 064.TCC, 065.TCC, 066.TCC, 069.TCC, 073.TCC, 074.TCC, 079.TCC, 093.TCC, 095.TCC, 096.TCC, 097.TCC, 098.TCC, 099.TCC, 100.TCC, 101.TCC, and 102.TCC.

COORDINATION RECOMMENDATIONS TABLE

POWER SYSTEM ENGINEERING Q2C# 39381338

Equipment Designation General Issue Recommendations

148 ATS 1‐11 Over 40 cal/cm2 ‐ Low‐voltage breaker is the line‐side protection Informative Only.

149 CDGV Over 40 cal/cm2 ‐ Low‐voltage breaker is the line‐side protection Informative Only.

201 L ELSP Over 40 cal/cm2 ‐ Low‐voltage breaker is the line‐side protection Informative Only.

202 PDP Over 40 cal/cm2 ‐ Low‐voltage breaker is the line‐side protection Informative Only.

259 XF‐G SEC Over 40 cal/cm2 ‐ Customer owned relay is the line‐side protection Informative Only.

271 MSD Over 40 cal/cm2 ‐ Customer owned relay is the line‐side protection Informative Only.

272 MDP Over 40 cal/cm2 ‐ Customer owned relay is the line‐side protection Informative Only.

294 MSD Over 40 cal/cm2 ‐ Customer owned relay is the line‐side protection Informative Only.

312 ATS Over 40 cal/cm2 ‐ Customer owned relay is the line‐side protection Informative Only.

313 MCC‐1 Over 40 cal/cm2 ‐ Customer owned relay is the line‐side protection Informative Only.

428 DP‐1 Over 40 cal/cm2 ‐ Low‐voltage breaker is the line‐side protection Informative Only.

485 SUB 11A Over 40 cal/cm2 ‐ Customer owned relay is the line‐side protection Informative Only.

486 SUB 11B Over 40 cal/cm2 ‐ Customer owned relay is the line‐side protection Informative Only.

877 DP‐2 Over 40 cal/cm2 ‐ Low‐voltage breaker is the line‐side protection Informative Only.

905 BLDG 1C SW'GR MAIN Over 40 cal/cm2 ‐ Customer owned relay is the line‐side protection Informative Only.

905 BLDG 1C SW'GR FEEDERS Over 40 cal/cm2 ‐ Customer owned relay is the line‐side protection Informative Only.

AF RECOMMENDATIONS TABLE

1.4 Study Highlights

1.4.1 Short-Circuit

Of the 488 device locations evaluated for adequacy to interrupt or withstand the maximum three-phase short-circuit current to which they could be subjected, 53 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.

Graph of equipment short-circuit capability

1.4.2 Coordination

Setting recommendations have been made for adjustable devices to ensure optimum selectivity, reduce arc flash, or protect equipment. Time-current coordination (TCC) graphs were used to perform the evaluation for the overcurrent devices. Overall, the results showed that acceptable levels of selectivity were achieved among devices in the system except as shown on TCCs 07.TCC, 023.TCC, 027.TCC, 032.TCC, 035.TCC, 044.TCC, 045.TCC, 046.TCC, 056.TCC, 059.TCC, 061.TCC, 064.TCC, 065.TCC, 066.TCC, 069.TCC, 073.TCC, 074.TCC, 079.TCC, 093.TCC, 095.TCC, 096.TCC, 097.TCC, 098.TCC, 099.TCC, 100.TCC, 101.TCC, and 102.TCC. TCCs and equipment recommendations are discussed in Section 1.3.2 Study Recommendation Tables.

While the electrical system does not meet the selective coordination requirements as specified in the latest edition of the NEC, coordination has been optimized as far as practicable. Consult the Coordination Recommendations Table for more information.

The breakers in the system should be set to the recommended levels found in the Overcurrent Device Setting Tables section.

Recommendations for equipment changes can result in equipment which is larger in ampacity and/or physical footprint, may require changes to other parts of the electrical design (e.g., cable and conduit sizing), and could also impact the architectural design.

When selective coordination, per NEC 700, is required, further analysis beyond the scope of this study will be necessary as well as possible equipment construction or design changes.

1.4.3 Arc Flash

Equipment was 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 to perform work on energized equipment with the “Over 40 cal/cm2” designation (16 locations).

Graph of arc flash hazard incident energy occurrence

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 must select/wear as well as what companies must issue to their employees.

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

1.4.4 Other Findings

Other issues, which are not formally in the scope of work, were observed in the course of data collection and analysis. These could be NEC compliance issues, equipment having poor condition of maintenance, grounding, or some other critical factor.

2 INTRODUCTION

This report has the following components:

Studies were performed using nationally recognized electrical engineering analysis software SKM Power Tools Version 7.0.4.6.

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

A “REFERENCES” section near the end of the report cites who supplied information or how the data was obtained. The majority of this data is filed with the project and has not been reproduced in this report. Abbreviations and trademarks referenced throughout this report are also listed in an appendix.

3 STUDY DATA

3.1 Importance

The results of the study analyses are highly dependent on the accuracy of study data.

Modifications or clarifications of study data will likely alter study results. This study recommends a re-evaluation with actual utility data and cable lengths.

Short-circuit calculations can be conservatively estimated in order to evaluate equipment short-circuit ratings. Overcurrent device coordination can be evaluated using estimated short-circuit values to determine how well the system coordinates. For the following study types, it is essential to have accurate and complete data because of the significant impact the data has on the results: arc flash.

This study will be revised to include these analyses once all the required data has been obtained. See section 3.2 Missing Data for a full list of data needed.

3.2 Missing Data

The following critical information was not available:

Cables (length, size, type – CU/AL) Existing equipment information Generator submittal (including generator breakers) ATS submittal (including withstand rating) UPS submittal Current transformer ratios for 901 HVSN-3-1.

3.3 Estimates & Assumptions

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. These estimates are noted on the one-line diagrams.

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

COMED has advised that their system can deliver a maximum available three-phase short-circuit current of 8,700A at 4160V with an assumed X/R ratio of 8 at the secondary of TR-1 and 8,600A at 4160V with an assumed X/R ratio of 8 at the secondary of TR-2.

These values were obtained from an existing study dated June 2017 by Eaton Elecrical Services and Systems. These values determined the starting point for the analysis. No minimum or alternate switching levels were given.

4.2.2 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.

4.2.3 Transformer Data

Typical Schneider Electric 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.

4.2.4 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, a fault contribution of 4 times rated current, is estimated. Larger motors (50 hp and above) have an estimated 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.

Unless otherwise indicated in the SC Computer Input Tabulations appendix, some motor loads are modeled as lumped induction motors connected directly to the low voltage buses using the recommended subtransient reactance values from C37.010, C37.13, and IEEE Std. 141. These modeled values appear in the appendices.

4.3 Short-Circuit Analysis Results

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. When applicable, the bolted line-to-ground fault current was considered instead. The results are listed in the "SHORT-CIRCUIT EVALUATION

TABLE".

Short-circuit case description(s): COMED has advised that their system can deliver a maximum available three-phase short-circuit current of 8,700A at 4160V with an assumed X/R ratio of 8 at the secondary of TR-1 and 8,600A at 4160V with an assumed X/R ratio of 8 at the secondary of TR-2. The tie breakers were closed at the medium voltage switchgear with one main breaker open assuming the two utility sources cannot be paralleled. The tie breakers at the low voltage switchgear/switchboards were closed and on main breaker open assuming the two utility sources cannot be paralleled. The 3.2MW generator was paralleled with 5kV incoming medium voltage switchgear. The utility sources and the low voltage generators were not paralleled. The Short-Circuit Evaluation table is based upon the higher utility sources.

Listed in the tables are the calculated short-circuit currents at each piece of equipment and the ratings of the lowest rated device in the equipment enclosure. Comparing the two sets of values shows that all of the equipment examined is either adequate by itself or when used in series with another circuit breaker or protected by a line side current-limiting fuse or circuit breaker except for the equipment noted in the “SHORT-CIRCUIT INADEQUATE EQUIPMENT TABLE” found in the Study Recommendations section.

The table also lists some equipment that was not evaluated because the equipment’s rating could not be determined at the time of study preparation. These are identified by note number ‘1’ in the far right hand column of the table. Evaluation of this equipment by the customer is necessary to verify the equipment’s short-circuit current rating is greater than the calculated fault duty, which can be evaluated by referring to the short-circuit output report. For each bus modeled, that report contains evaluations for UL and ANSI equipment and if necessary Schneider Electric Engineering Services, LLC can assist in this evaluation.

For equipment evaluation, 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 found in industry standards.

Refer to the Summary of Test Power Factor and X/R Values for LV Devices table in the General Procedure section for more information.

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 Table

#N/A JESSE BROWN VA MEDICAL CENTER

POWER SYSTEM ENGINEERING Q2C# 39381338

TYPE AIC OR WCR EVALUATION #

003 SW'GR BLDG 21A 4160.0 SCCR63 63,000 18,609 11.807 Adequate 006 ENG CNTR 4160.0 VR K=1; 0250 MVA; 4.76kV 40,000 18,509 11.860 Adequate 009 SUB 1C 4160.0 SCCR63 63,000 16,589 6.625 Adequate 013 SUB 1C 4160.0 SCCR63 63,000 16,589 6.624 Adequate 015 SWGR 4160.0 VAD‐2 250 MVA 33,183 17,493 8.663 Adequate

016 CH‐1 MCC 4160.0 #N/A 17,173 7.211 #N/A 1

018 CH‐2 MCC 4160.0 #N/A 17,173 7.218 #N/A 1

020 SWGR 4160.0 VAD‐2 250 MVA 33,183 17,460 8.378 Adequate

021 CH‐3 MCC 4160.0 #N/A 17,141 7.039 #N/A 1

031 SUB 10 PRI 4160.0 EJO‐1 50,000 11,938 1.459 Adequate

032 SUB 8A PRI 4160.0 #N/A 17,088 5.461 #N/A

035 SW'GR BLDG 21 TIE 4160.0 SCCR63 63,000 18,609 11.806 Adequate 036 SW'GR BLDG 21B 4160.0 SCCR63 63,000 18,609 11.804 Adequate 100 SUB 8B 208.0 SCCR42 42,000 36,425 5.816 Adequate 101 SUB 8A 208.0 SCCR42 42,000 36,425 5.816 Adequate

102 PE‐1A 208.0 #N/A 21,093 1.841 #N/A 1

103 PE‐1 208.0 SCCR10 10,000 16,774 1.386 INADEQUATE 2

104 ATS 1‐1 208.0 SCCR50 50,000 30,578 3.440 Adequate 106 PDP 208.0 SCCR200 200,000 23,810 2.179 Adequate

108 GTT 208.0 #N/A 31,296 4.552 #N/A 1

109 D2K 208.0 SCCR200 200,000 7,588 1.886 Adequate 110 FJ DISC 208.0 SCCR22 22,000 7,471 1.870 Adequate

111 SERVICE LINE 208.0 #N/A 6,815 1.586 #N/A 1

112 2KL 208.0 SCCR10 10,000 7,496 1.820 Adequate 113 2KR 208.0 SCCR10 10,000 7,581 1.841 Adequate 114 2K3 208.0 SCCR10 10,000 7,668 1.863 Adequate 115 2K5 208.0 SCCR10 10,000 4,458 0.716 Adequate 116 2K2 208.0 #N/A 7,280 1.779 #N/A 1 117 2K4 208.0 SCCR10 10,000 7,135 1.733 Adequate

119 GB1 208.0 #N/A 10,624 1.098 #N/A 1

120 GB 208.0 QOB 10,000 13,618 2.049 INADEQUATE 3

120 GB 208.0 Q2 10,000 13,618 2.049 INADEQUATE 7

121 GB2 208.0 SCCR22 22,000 11,773 1.490 Adequate

124 1BL 208.0 SCCR10 10,000 12,467 1.957 INADEQUATE 3

125 1BR 208.0 #N/A 12,075 1.957 #N/A

SHORT‐CIRCUIT

EVALUATION TABLE

BUS

NO.

EQUIP. DESCRIPTION

PER SYSTEM

ONE LINE DIAGRAM(S)

NOMINAL

L‐L VOLTS

LOWEST RATED DEVICE

IN EQUIPMENT ENCLOSURE

MAXIMUM AVAILABLE

SCA OR DUTY

X/R

RATIO

LINE SIDE

MAXIMUM

DEVICE

LINE SIDE

SERIES

RATING

NOTES

#N/A = Number not available.

SCET Page 1 of 16

POWER SYSTEM ENGINEERING Q2C# 39381338

TYPE AIC OR WCR EVALUATION #

SHORT‐CIRCUIT

EVALUATION TABLE

BUS

NO.

EQUIP. DESCRIPTION

PER SYSTEM

ONE LINE DIAGRAM(S)

NOMINAL

L‐L VOLTS

LOWEST RATED DEVICE

IN EQUIPMENT ENCLOSURE

MAXIMUM AVAILABLE

SCA OR DUTY

X/R

RATIO

LINE SIDE

MAXIMUM

DEVICE

LINE SIDE

SERIES

RATING

NOTES

127 2BR 208.0 SCCR65 65,000 12,340 2.120 Adequate 128 2BL 208.0 SCCR65 65,000 12,266 2.102 Adequate 129 2B2 208.0 SCCR65 65,000 11,773 1.990 Adequate 131 3BR 208.0 SCCR10 10,000 9,218 1.066 Adequate 132 3BL 208.0 SCCR10 10,000 9,167 1.055 Adequate 134 4B 208.0 SCCR10 10,000 8,737 1.046 Adequate 135 4B1 208.0 SCCR22 22,000 8,710 1.031 Adequate 137 5B 208.0 SCCR10 10,000 8,778 1.047 Adequate 139 6B 208.0 SCCR10 10,000 8,369 1.181 Adequate 140 6B1 208.0 SCCR10 10,000 6,184 0.731 Adequate 141 6B2 208.0 SCCR10 10,000 4,882 0.618 Adequate 143 7B 208.0 SCCR10 10,000 7,940 1.152 Adequate 145 8B 208.0 SCCR10 10,000 7,313 1.112 Adequate 147 9B 208.0 SCCR10 10,000 7,008 1.093 Adequate 148 ATS 1‐11 208.0 SCCR85 85,000 31,181 4.782 Adequate 149 CDGV 208.0 SCCR65 65,000 30,747 4.690 Adequate 151 C1B 208.0 SCCR10 10,000 6,798 1.797 Adequate 153 C2B 208.0 SCCR10 10,000 6,608 1.790 Adequate 155 C3B 208.0 SCCR10 10,000 6,428 1.783 Adequate 157 C5B 208.0 SCCR10 10,000 6,028 1.792 Adequate 159 C6B 208.0 SCCR10 10,000 5,864 1.785 Adequate 161 C7B 208.0 SCCR10 10,000 5,785 1.795 Adequate 163 C8B 208.0 SCCR10 10,000 5,477 1.747 Adequate 165 C1C 208.0 SCCR10 10,000 6,798 1.797 Adequate 167 C2C 208.0 SCCR10 10,000 6,608 1.790 Adequate 169 C3C 208.0 SCCR10 10,000 6,536 1.801 Adequate 171 C4C 208.0 SCCR10 10,000 6,384 1.807 Adequate 173 C5C 208.0 SCCR10 10,000 5,915 1.764 Adequate 175 C6C 208.0 SCCR10 10,000 5,864 1.785 Adequate 177 C7C 208.0 SCCR10 10,000 5,785 1.795 Adequate 179 C8C 208.0 SCCR10 10,000 5,574 1.773 Adequate 181 C1D 208.0 SCCR10 10,000 5,874 1.762 Adequate 183 C2D 208.0 SCCR10 10,000 5,732 1.757 Adequate 185 C3D 208.0 SCCR10 10,000 5,595 1.752 Adequate 187 C4D 208.0 SCCR10 10,000 5,610 1.787 Adequate

#N/A = Number not available.

SCET Page 2 of 16

POWER SYSTEM ENGINEERING Q2C# 39381338

TYPE AIC OR WCR EVALUATION #

SHORT‐CIRCUIT

EVALUATION TABLE

BUS

NO.

EQUIP. DESCRIPTION

PER SYSTEM

ONE LINE DIAGRAM(S)

NOMINAL

L‐L VOLTS

LOWEST RATED DEVICE

IN EQUIPMENT ENCLOSURE

MAXIMUM AVAILABLE

SCA OR DUTY

X/R

RATIO

LINE SIDE

MAXIMUM

DEVICE

LINE SIDE

SERIES

RATING

NOTES

189 C5D 208.0 SCCR10 10,000 5,290 1.761 Adequate 191 C6D 208.0 SCCR10 10,000 5,163 1.755 Adequate 193 C7D 208.0 SCCR10 10,000 5,053 1.751 Adequate 195 C8D 208.0 SCCR10 10,000 4,867 1.724 Adequate 197 C9D 208.0 SCCR10 10,000 4,771 1.721 Adequate

198 GE1‐1 208.0 #N/A 24,376 1.739 #N/A 1

199 ATS 1‐12 208.0 SCCR50 50,000 5,906 1.601 Adequate 202 PDP 208.0 SCCR200 200,000 33,205 5.033 Adequate 209 6A 208.0 SCCR10 10,000 6,459 1.800 Adequate 210 6A1 208.0 SCCR10 10,000 6,326 1.729 Adequate 212 7A 208.0 SCCR10 10,000 6,287 1.793 Adequate 213 7A1 208.0 SCCR10 10,000 6,165 1.724 Adequate 215 8A 208.0 SCCR10 10,000 6,109 1.786 Adequate 216 8A1 208.0 SCCR10 10,000 5,999 1.719 Adequate 218 9A 208.0 SCCR10 10,000 5,954 1.779 Adequate 219 9A1 208.0 SCCR10 10,000 5,854 1.715 Adequate 221 3AL 208.0 SCCR10 10,000 7,076 1.825 Adequate 222 3AR 208.0 SCCR10 10,000 7,076 1.825 Adequate 223 3A1 208.0 SCCR10 10,000 6,517 1.568 Adequate 225 4A 208.0 SCCR10 10,000 6,961 1.838 Adequate 226 4A1 208.0 SCCR10 10,000 6,836 1.792 Adequate 227 4A2 208.0 #N/A 6,399 1.497 #N/A 1 229 5AL 208.0 SCCR10 10,000 6,657 1.808 Adequate 230 5AR 208.0 SCCR10 10,000 6,657 1.808 Adequate 232 GAL 208.0 SCCR10 10,000 7,917 1.880 Adequate 233 GAR 208.0 SCCR10 10,000 7,839 1.864 Adequate 235 1A 208.0 SCCR10 10,000 7,637 1.868 Adequate 237 2A 208.0 SCCR10 10,000 7,397 1.857 Adequate 239 5C 208.0 SCCR10 10,000 5,446 1.767 Adequate 241 6C 208.0 SCCR10 10,000 5,192 1.729 Adequate 243 7C 208.0 SCCR10 10,000 5,160 1.747 Adequate 245 8C 208.0 SCCR10 10,000 5,040 1.743 Adequate 247 3C 208.0 SCCR10 10,000 5,681 1.768 Adequate 249 4C 208.0 SCCR10 10,000 5,586 1.773 Adequate 250 4C2 208.0 SCCR10 10,000 5,507 1.739 Adequate

#N/A = Number not available.

SCET Page 3 of 16

POWER SYSTEM ENGINEERING Q2C# 39381338

TYPE AIC OR WCR EVALUATION #

SHORT‐CIRCUIT

EVALUATION TABLE

BUS

NO.

EQUIP. DESCRIPTION

PER SYSTEM

ONE LINE DIAGRAM(S)

NOMINAL

L‐L VOLTS

LOWEST RATED DEVICE

IN EQUIPMENT ENCLOSURE

MAXIMUM AVAILABLE

SCA OR DUTY

X/R

RATIO

LINE SIDE

MAXIMUM

DEVICE

LINE SIDE

SERIES

RATING

NOTES

252 GC 208.0 SCCR10 10,000 6,248 1.803 Adequate 254 1C 208.0 #N/A 6,018 1.795 #N/A 1 255 1C1 208.0 SCCR10 10,000 5,869 1.745 Adequate 257 2C 208.0 SCCR10 10,000 5,833 1.766 Adequate 258 2C1 208.0 SCCR10 10,000 5,899 1.783 Adequate 259 XF‐G SEC 480.0 SCCR100 100,000 20,207 6.305 Adequate 260 MCC‐G 480.0 SCCR22 22,000 20,055 6.225 Adequate 271 MSD 480.0 SCCR35 35,000 19,044 6.539 Adequate 272 MDP 480.0 SCCR35 35,000 18,999 6.502 Adequate

276 LPB1/B2 480.0 EDB(3P) 18,000 19,901 5.834 INADEQUATE 4

277 LPA1/A2 480.0 EDB(1P) 18,000 20,134 5.839 INADEQUATE 4

280 PP‐A 208.0 SCCR10 10,000 8,078 3.479 Adequate 281 RP‐D 208.0 SCCR10 10,000 3,176 0.797 Adequate 282 RP‐A 208.0 SCCR10 10,000 3,176 0.797 Adequate 283 RP‐E 208.0 SCCR10 10,000 1,941 0.551 Adequate 284 RPB1/2 208.0 SCCR100 100,000 3,306 0.994 Adequate 285 RP‐C 208.0 SCCR100 100,000 2,630 0.680 Adequate 288 100A DISC 208.0 SCCR5 5,000 1,894 2.836 Adequate 289 RP‐D 208.0 SCCR10 10,000 1,110 0.949 Adequate 290 100A DISC 208.0 SCCR5 5,000 1,888 2.796 Adequate 291 RP‐F 208.0 SCCR10 10,000 1,035 0.881 Adequate 294 MSD 480.0 SCCR65 65,000 26,835 7.085 Adequate 295 MCC 480.0 SCCR42 42,000 22,215 4.237 Adequate 299 HDP2‐1 480.0 SCCR18 18,000 16,418 2.313 Adequate

302 LDP1‐1 208.0 QOB 10,000 10,923 3.472 INADEQUATE 3

302 LDP1‐1 208.0 QB 10,000 10,923 3.472 INADEQUATE 5

303 LP1‐1A 480.0 EDB(3P) 18,000 25,697 4.402 INADEQUATE 4

304 LP2‐1A 480.0 SCCR18 18,000 8,596 0.816 Adequate

305 PP‐1 480.0 EDB(3P) 18,000 25,697 4.402 INADEQUATE 4

307 LDP1‐2 208.0 SCCR10 10,000 8,185 2.180 Adequate 310 LDP1‐3 208.0 SCCR10 10,000 7,188 1.894 Adequate

312 ATS 480.0 #N/A 31,263 8.062 #N/A 1

313 MCC‐1 480.0 SCCR65 65,000 33,172 7.446 Adequate

319 H1 480.0 SCCR14 14,000 27,800 2.887 INADEQUATE 2

320 MCC‐2 480.0 SCCR65 65,000 22,865 4.098 Adequate

#N/A = Number not available.

SCET Page 4 of 16

POWER SYSTEM ENGINEERING Q2C# 39381338

TYPE AIC OR WCR EVALUATION #

SHORT‐CIRCUIT

EVALUATION TABLE

BUS

NO.

EQUIP. DESCRIPTION

PER SYSTEM

ONE LINE DIAGRAM(S)

NOMINAL

L‐L VOLTS

LOWEST RATED DEVICE

IN EQUIPMENT ENCLOSURE

MAXIMUM AVAILABLE

SCA OR DUTY

X/R

RATIO

LINE SIDE

MAXIMUM

DEVICE

LINE SIDE

SERIES

RATING

NOTES

324 L2 208.0 SCCR10 10,000 2,568 2.844 Adequate 329 L1 208.0 SCCR10 10,000 2,603 2.865 Adequate 330 DP 480.0 SCCR65 65,000 23,875 4.203 Adequate 334 SUB4A 208.0 SCCR100 100,000 34,054 5.786 Adequate 335 SUB 4B 208.0 SCCR100 100,000 34,054 5.786 Adequate 336 ATS 3 208.0 SCCR65 65,000 27,923 4.007 Adequate

337 DPCP 208.0 SCCR10 10,000 29,136 3.049 INADEQUATE 2

338 ATS 4 208.0 SCCR50 50,000 27,923 4.007 Adequate 339 DPCP‐2 208.0 SCCR42 42,000 21,420 2.364 Adequate 341 GC 208.0 SCCR22 22,000 8,782 1.218 Adequate

342 GCA 208.0 #N/A 8,695 1.200 #N/A 1

344 1C 208.0 SCCR22 22,000 8,519 1.205 Adequate 345 1C‐1G 208.0 SCCR22 22,000 7,422 0.974 Adequate 347 2C 208.0 SCCR22 22,000 8,199 1.187 Adequate 349 5C 208.0 SCCR22 22,000 7,733 1.168 Adequate 350 5CA 208.0 SCCR22 22,000 4,892 0.718 Adequate 352 6C 208.0 SCCR22 22,000 7,589 1.162 Adequate 353 6CA 208.0 SCCR22 22,000 4,685 0.702 Adequate 355 5B 208.0 SCCR22 22,000 10,359 1.298 Adequate 357 6B 208.0 SCCR22 22,000 10,050 1.282 Adequate 358 6BB 208.0 SCCR22 22,000 6,468 0.767 Adequate 360 5A 208.0 SCCR22 22,000 10,296 1.278 Adequate 361 5AA 208.0 SCCR22 22,000 6,853 0.790 Adequate 363 6A 208.0 SCCR22 22,000 10,050 1.282 Adequate 364 6AA 208.0 SCCR22 22,000 6,207 0.740 Adequate 365 7A 208.0 SCCR22 22,000 9,010 1.094 Adequate 366 P5 208.0 SCCR22 22,000 11,253 2.135 Adequate

368 GD‐L 208.0 SCCR10 10,000 18,129 1.805 INADEQUATE 2

369 GD‐R 208.0 SCCR10 10,000 18,129 1.805 INADEQUATE 2

371 1D‐L 208.0 SCCR22 22,000 16,921 1.717 Adequate 372 1D‐R 208.0 SCCR22 22,000 17,215 1.748 Adequate 374 2D‐L 208.0 SCCR22 22,000 16,006 1.644 Adequate 375 2D‐R 208.0 SCCR22 22,000 16,271 1.670 Adequate 377 5D‐L 208.0 SCCR22 22,000 13,461 1.459 Adequate 378 5D‐R 208.0 SCCR22 22,000 13,461 1.459 Adequate

#N/A = Number not available.

SCET Page 5 of 16

POWER SYSTEM ENGINEERING Q2C# 39381338

TYPE AIC OR WCR EVALUATION #

SHORT‐CIRCUIT

EVALUATION TABLE

BUS

NO.

EQUIP. DESCRIPTION

PER SYSTEM

ONE LINE DIAGRAM(S)

NOMINAL

L‐L VOLTS

LOWEST RATED DEVICE

IN EQUIPMENT ENCLOSURE

MAXIMUM AVAILABLE

SCA OR DUTY

X/R

RATIO

LINE SIDE

MAXIMUM

DEVICE

LINE SIDE

SERIES

RATING

NOTES

380 6D‐L 208.0 SCCR22 22,000 13,691 1.489 Adequate 381 6D‐R 208.0 SCCR22 22,000 13,691 1.489 Adequate

382 DPD 208.0 SCCR14 14,000 19,234 2.580 INADEQUATE 2

383 A 208.0 SCCR10 10,000 16,264 1.609 INADEQUATE 2

384 AD 208.0 SCCR10 10,000 9,613 0.653 Adequate 385 BD 208.0 SCCR10 10,000 9,613 0.653 Adequate

386 CD 208.0 SCCR10 10,000 10,701 0.953 INADEQUATE 2

387 DD 208.0 SCCR10 10,000 4,247 0.329 Adequate

388 ED 208.0 SCCR10 10,000 13,388…