36C25018B0461-0002005.pdf

Arc Flash Study of VA Medical Center

Marion, IN

VA Project Number: 610-11-105

Prepared by

Apogee Consulting Group, PA 7330 Chapel Hill Road

Suite 202 Raleigh, NC 27607

Arc Flash Study of VA Medical Center

Marion, IN

VA Project Number: 610-11-105

Patrick Taylor, P.E.

Apogee Consulting Group, PA

7330 Chapel Hill Road

Suite 202

Raleigh, NC 27607

Page ii

Table of Contents

1.0 Introduction

2.0 Overview of Electrical Distribution System

3.0 Arc Flash Mitigation and Selective Coordination

4.0 Arc Flash Study Results

5.0 Assumptions & Limitations

Attachments:

1 One-Line Drawings (50 Pages)

2 Arc Flash Calculations (46 Pages)

3 Arc Flash Labels (229 Pages)

1.0 Introduction

A large amount of energy exists in electrical systems. In the event of a fault in electrical equipment, this energy can be released in the form of an arc flash. An arc flash is an explosion releasing superheated plasma temperatures exceeding 5000 degrees Fahrenheit. This blast can expel molten metal and shrapnel capable of serious injury and frequently death to electrical workers. A study must be conducted to determine the amount of incident energy present at all locations in an electrical distribution. This study specifies the amount of personal protective equipment (PPE) should be worn while performing work on energized electrical equipment.

This document reports on the results of arc flash hazard study of the commercial power system as displayed in Attachment 1.

The goal of the study was to calculate the arc flash incident energies and arc flash protection boundaries at locations that pose an arc flash hazard risk, and produce NFPA 70E-compliant arc flash hazard labels for such locations.

2.0 Overview of Electrical Distribution System

Attachment 1 presents the one-line diagrams of the power system under study. The electrical system is a campus-wide distribution fed by two 12,470 Volt utility circuits located at Building 145.

Buildings 1, 2, 3, 4, 5 and 6 are fed by utility switch “M”.

Buildings 8, 9, 10 and 55 are fed by utility switch “C”.

Buildings 12 and 138 are fed by utility switch “J”.

Buildings 15, 16, 124 and 127 are fed by utility switch “P”.

Buildings 41, 51, 52, 53, 54, 79, 97, 137, 153, T504 and T513 are fed by utility switch “B”.

Buildings 47 and 49 are fed by utility switch “O”.

Buildings 65 and 114 are fed by utility switch “I”.

Buildings 76, 102, 120, 173 and 165 are fed by utility switch “A”.

Building 170 is fed from a separate utility service.

Buildings 172 and 174 are fed by utility switches “Q” and “T”.

Building 175 is fed by utility switches “R” and “S”.

Building 185 is fed by utility switches “M” and “U”.

3.0 Arc Flash Mitigation and Selective Coordination

There are several methods to mitigate arc flash hazards to a category 2 or below.

3.1 Circuit breaker setting changes can reduce the time involved to clear a fault, thus lowering the incident energy and arc flash hazard. In some instances, breaker setting changes can reduce the level of coordination.

Below is a list of all locations category 3 and above that can be easily coordinated by changing breaker settings.

Building 138CHILLER Change instantaneous settings of CB-1200A-CHILLER from “12” to “6”.

3.2 Some equipment cannot be as easily mitigated. The equipment listed below can be mitigated by changing some circuit breakers or other distribution equipment. Also listed below are distribution change recommendations to mitigate the arc flash hazard at each location.

Note that the breaker setting changes listed below may require alterations to electrical distribution system including panelboards and/or other distribution equipment in order to maintain breaker coordination.

Buildings 15, 16, 17, 124 and 127

3.2.1 127 The 225A main circuit breaker would need to be changed out to one with a lower instantaneous pickup setting.

3.2.2 127-PP2 The 225A main circuit breaker would need to be changed out to one with a lower instantaneous pickup setting.

3.2.3 15-1 This panelboard is protected by a fuse with no settings. This fuse would need to be changed out to one with a lower instantaneous pickup setting.

3.2.4 15-1A The 225A main circuit breaker would need to be changed out to one with a lower instantaneous pickup setting.

3.2.5 15-1B The 225A main circuit breaker would need to be changed out to one with a lower instantaneous pickup setting.

3.2.6 15-2 The 225A main circuit breaker would need to be changed out to one with a lower instantaneous pickup setting.

3.2.7 15-2A The 225A main circuit breaker in panel 15-2 would need to be changed out to one with a lower instantaneous pickup setting.

3.2.8 16-EEDP The 225A main circuit breaker would need to be changed out to one with a lower instantaneous pickup setting.

3.2.9 17-1 The 225A main circuit breaker would need to be changed out to one with a lower instantaneous pickup setting.

3.2.10 17-1C The 200A main circuit breaker would need to be changed out to one with a lower instantaneous pickup setting.

3.2.11 ATS B127 This transfer switch is protected by a fuse with no settings. This fuse would need to be changed out to one with a lower instantaneous pickup setting.

3.2.12 ATS EEDP The 600A circuit breaker protecting this transfer switch is already set on the lowest possible setting. Possible mitigation strategies may include changing this breaker to a lower ampacity rating or zone interlocking.

These solutions would need to be further investigated prior to implementation.

3.2.13 DS Computer Rm A/C This disconnect switch is protected by a fuse with no settings.

This fuse would need to be changed out to one with a lower instantaneous pickup setting.

3.2.14 ECB AC Equipment This enclosed circuit breaker is protected by a fuse with no settings. This fuse would need to be changed out to one with a lower instantaneous pickup setting.

3.2.15 ECB UPS Equipment This enclosed circuit breaker is protected by a fuse with no settings. This fuse would need to be changed out to one with a lower instantaneous pickup setting.

3.2.16 EHDS2 Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.17 ELDS1 Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.18 EM SWBD Bldg 124 Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.19 FDS IDE The 600A circuit breaker protecting this transfer switch is already set on the lowest possible setting. Possible mitigation strategies may include changing this breaker to a lower ampacity rating or zone interlocking.

These solutions would need to be further investigated prior to implementation.

3.2.20 FDS ATS 127 This disconnect switch is protected by a fuse with no settings. This fuse would need to be changed out to one with a lower instantaneous pickup setting.

3.2.21 FDS Bypass #1 This disconnect switch is protected by a fuse with no settings. This fuse would need to be changed out to one with a lower instantaneous pickup setting.

3.2.22 FDS MDP124 Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.23 FDS MDP16 Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.24 MDP 124 This panelboard is protected by a fuse with no settings. This fuse would need to be changed out to one with a lower instantaneous pickup setting.

3.2.25 MDP16 This panelboard is protected by a fuse with no settings. This fuse would need to be changed out to one with a lower instantaneous pickup setting.

Buildings 51, 54, 97, 137, 153, T504 and T516

3.2.26 52-MDP This panelboard is protected by a fuse with no settings. This fuse would need to be changed out to one with a lower instantaneous pickup setting.

3.2.27 EP-1 The 200A main circuit breaker would need to be changed out to one with a lower instantaneous pickup setting.

3.2.28 Shelter House/Bldg 153 No overcurrent protective device is present. It is recommended to insert a fused disconnect switch or enclosed circuit breaker and to select a device capable of mitigating the current arc flash hazard level.

Buildings 76 and 165

3.2.29 200 kW Gen 76 No settings are present in the generator circuit breaker. It may be possible to replace this breaker with one that has a lower instantaneous pickup setting.

3.2.30 ATS 76 No overcurrent protective device is present. It is recommended to insert a fused disconnect switch or enclosed circuit breaker and to select a device capable of mitigating the current arc flash hazard level.

3.2.31 DS Main Service No overcurrent protective device is present. It is recommended to insert a fused disconnect switch or enclosed circuit breaker and to select a device capable of mitigating the current arc flash hazard level.

3.2.32 ECB Gen 76 Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.33 MDP Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

Buildings 102, 120 and 173

3.2.34 173A The 225A main circuit breaker in would need to be changed out to one with a lower instantaneous pickup setting.

Building 138

3.2.35 12-COND UNIT The 225A main circuit breaker would need to be changed out to one with a lower instantaneous pickup setting.

3.2.36 12-MDPE Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.37 138-EQXP Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.38 138-ICUE Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.39 620 kW Gen 3 Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.40 750 kW Gen 2 Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.41 750 kW Gen1 Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.42 AC UNIT 3RD FL Setting changes do not change the arc flash hazard level. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.43 AHU-2 The 110A circuit breaker would need to be changed out to one with a lower instantaneous pickup setting.

3.2.44 AHU-3 The 110A circuit breaker would need to be changed out to one with a lower instantaneous pickup setting.

3.2.45 138-ATS-9 Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.46 ATS 138-EEDP-A Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.47 ATS 138-EMDP-A Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.48 BBB Settings for existing breakers cannot be changed due to selective

3.2.49 E1A The 60A circuit breaker would need to be changed out to one with a lower instantaneous pickup setting.

3.2.50 EBA The 60A circuit breaker would need to be changed out to one with a lower instantaneous pickup setting.

3.2.51 EBB The 200A circuit breaker would need to be changed out to one with a lower instantaneous pickup setting.

3.2.52 EEDP Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.53 EHDS2 Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.54 EM-1 Setting changes do not change the arc flash hazard level. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.55 EM-2 The 200A circuit breaker would need to be changed out to one with a lower instantaneous pickup setting.

3.2.56 EMDP Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.57 EMDP-1 No overcurrent protective device is present. It is recommended to insert a fused disconnect switch or enclosed circuit breaker and to select a device capable of mitigating the current arc flash hazard level.

3.2.58 MCC-1 The 100A circuit breaker would need to be changed out to one with a lower instantaneous pickup setting.

3.2.59 MDP-1 Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.60 MTS Gen 3 Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.61 P1 The 60A circuit breaker would need to be changed out to one with a lower instantaneous pickup setting.

3.2.62 P1A The 100A circuit breaker would need to be changed out to one with a lower instantaneous pickup setting.

3.2.63 PH1 The 300A circuit breaker would need to be changed out to one with a

3.2.64 RCU The 100A circuit breaker would need to be changed out to one with a lower instantaneous pickup setting.

3.2.65 RF-2 The 110A circuit breaker would need to be changed out to one with a lower instantaneous pickup setting.

3.2.66 Smoking Shelter 172 The 125A circuit breaker would need to be changed out to one with a lower instantaneous pickup setting.

Buildings 172 and 175

3.2.67 1HC2-C The 300A main circuit breaker would need to be changed out to one with a lower instantaneous pickup setting.

3.2.68 1HE6-E Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.69 1LE6A-E Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.70 1LE6B-E Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.71 ATS #1 Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.72 ATS #3 Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.73 ATS #4 Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.74 ATS #8 Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking

3.2.75 HDSC Settings for existing breakers cannot be changed due to selective breakers. This solution would need to be further investigated prior to implementation.

3.2.76 HDSE1 Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.77 MDSH5 Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.78 MDSH6 Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

Building 174

3.2.79 1LK1-K The 250A main circuit breaker would need to be changed out to one with a lower instantaneous pickup setting.

3.2.80 DMSH4 Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.81 ELEV S11 16 North Car Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.82 LNDP1 Setting changes do not change the arc flash hazard level. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.83 MDSH3 Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

Building 185

3.2.84 ATS CR Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking

3.2.85 ATS EQ Settings for existing breakers cannot be changed due to selective breakers. This solution would need to be further investigated prior to implementation.

3.2.86 BLCR1 The 225A main circuit breaker would need to be changed out to one with a lower instantaneous pickup setting.

3.2.87 BLEQDP Setting changes do not change the arc flash hazard level. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.88 BLLS1 The 150A main circuit breaker would need to be changed out to one with a lower instantaneous pickup setting.

3.2.89 ECB-800A MLEDP Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.90 MLEDP Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.91 MLNDP Settings for existing breakers cannot be changed due to selective coordination. Possible mitigation strategies may include zone interlocking breakers. This solution would need to be further investigated prior to implementation.

3.2.92 RF-1 The 400A circuit breaker would need to be changed out to one with a lower instantaneous pickup setting.

3.2.93 RF-3 The 400A circuit breaker would need to be changed out to one with a lower instantaneous pickup setting.

3.2.94 SF-1 The 400A circuit breaker would need to be changed out to one with a lower instantaneous pickup setting.

3.2.95 SF-2 The 400A circuit breaker would need to be changed out to one with a lower instantaneous pickup setting.

3.2.96 SF-3 The 400A circuit breaker would need to be changed out to one with a

4.0 Arc Flash Study Results

The objectives of the arc flash hazard compliance study were to calculate the arc flash incident energies and arc flash protection boundaries at locations that pose an arc flash hazard risk, and produce arc flash hazard labels compliant with the VA Electrical Design and with NFPA 70E-compliant for such locations.

NFPA 70E-compliant arc flash computations were performed per IEEE 1584 with the Arc Flash Evaluation module of the SKM Power Tools for Windows Electrical Software and are listed in Attachment 2.

Arc flash incident energies are calculated and grouped into five categories based on the personal protective equipment (PPE) necessary to wear or equip while performing maintenance on electrical equipment.

Category 0: 0 – 1.2 cal/cm2

Category 1: 1.2 – 4.0 cal/cm2

Category 2: 4.0 – 8.0 cal/cm2

Category 3: 8.0 – 25 cal/cm2

Category 4: 25 – 40 cal/cm2

Dangerous: greater than 40 cal/cm2 No PPE exists to protect workers at this level. No work should be completed on energized equipment with a Dangerous label.

The labels included as Attachment 3 have been produced in accordance with the values listed above and provide information regarding the required PPE. These labels include mitigated incident energies that include circuit breaker setting changes as noted in section 3.1. However, the labels do not include any mitigation strategies noted in section 3.2.

5.0 Assumptions & Limitations

The underlying assumptions and limitations of the results of this report are listed as follows:

5.1 The arc flash study of this report is limited solely to the determination of information to meet the arc flash labeling requirement of NFPA 70E and the VA Electrical Design Guide.

The results of this study do not address worker protection from electric shock or the serious physical injuries that can result from the arc blast event. As a result, even if the worker is outfitted with Personal Protective Equipment based on the results of this study, there is no guarantee that the worker will be protected from injury due to an arc flash event.

5.2 The arc flash study of this report is not a substitute for electrical safety training and an ongoing electrical safety program to direct both in-house and contracted workers who work on or near energized electrical equipment. Simply affixing arc flash labels to electrical equipment does not satisfy OSHA and NFPA 70E requirements to reduce worker exposure to electrical hazards. In accordance with NFPA 70E, the arc flash study results and arc flash labels of this report shall be reviewed within five years of the report date or sooner for any change in the electrical system.

5.3 The studies of this report do not address compliance of electrical and safety codes.

5.4 The accuracy, effectiveness and completeness of the results of this report are contingent on the accuracy and completeness of the information (i.e. diagrams, drawings, field data, etc.)

that was utilized in the preparation of this report. Therefore, any inaccuracy, inconsistency, or absence in or change to this information shall invalidate the results of this report and necessitate a redo of these studies at additional cost to the Client and/or User.

5.5 The accuracy, effectiveness and completeness of the results in this report are contingent on the expected performance of the electrical equipment from the manufacturers’ literature.

As such, any deviation from the expected performance of the electrical equipment (due to detrimental service conditions, excessive duty, excessive wear or aging, exposure to prior overloading or faults, manufacturing tolerances, incorrect operation, inadequate maintenance and testing, out-of-calibration, manufacturing defects, poor installation practice, etc.) shall invalidate the results of this report and necessitate a redo of these studies at additional cost to the Client and/or User.

5.6 All technical information is correct to the best of Apogee Consulting Group’s knowledge;

however, liability is disclaimed as to the accuracy, exclusion of printing errors, of the information provided in connection with these studies in this report.

2011 145 02/05/13

610-11-105ARC FLASH STUDY

VA MARION

50SAE EAG

1 & 2

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VA MARION

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3 & GEN.

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4 & 5

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8, 9, & 10

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VA MARION

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VA MARION

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