Vault 1 initial report.pdf

Electrical Engineering Services & Systems 530 Eastpark Ct, Suite G

Sandston, VA 23150

(724) 584-2626

GENERAL ORDER NUMBER: TQSIERM9845.1

REPORT NUMBER: ERM9845.1

SUBMITTED BY: JHONER GARCIA

www.EatonElectrical.com

SHORT-CIRCUIT, SELECTIVE & PROTECTIVE

DEVICE COORDINATION, AC ARC FLASH

INCIDENT ENERGY, AND LOAD FLOW ANALYSIS.

FOR

HUNTER HOLMES MCGUIRE VA MEDICAL

CENTER

RICHMOND, VA

VAULT # 1

REVISION 0

OCTOBER, 2022

http://www.eatonelectrical.com/

H.H. McGuire VA Medical Center i

REVISION HISTORY

Rev # TQS / Order Number Issued Revision / Modification Description

0 TQSIERM9845.1 11/2022 Vault #1 Switchgear Initial Study Report Issue

H.H. McGuire VA Medical Center ii

TABLE OF CONTENTS

REVISION HISTORY ............................................................................................................ I

TABLE OF CONTENTS ....................................................................................................... II

EXECUTIVE SUMMARY ....................................................................................... 1-1

SHORT-CIRCUIT ANALYSIS................................................................................ 2-1

PROTECTIVE DEVICE COORDINATION STUDY ................................................ 3-1

SELECTIVE COORDINATION EVALUATION ...................................................... 4-1

RECOMMENDED PROTECTIVE DEVICE SETTINGS ......................................... 5-1

ARC FLASH INCIDENT ENERGY ANALYSIS ..................................................... 6-1

LOAD FLOW STUDY ANALYSIS ......................................................................... 7-1

SYSTEM DATA ..................................................................................................... 8-1

H.H. McGuire VA Medical Center iii

SHORT-CIRCUIT INPUT REPORT ....................................................................... 9-1

SHORT-CIRCUIT RESULTS ............................................................................... 10-1

UTILITY DATA .................................................................................................... 11-1

LOAD-FLOW RESULTS ..................................................................................... 12-1

APPLICABLE CODES AND STANDARDS ........................................................ 13-1

ONE-LINE DIAGRAM INDEX .............................................................................. 14-1

H.H. McGuire VA Medical Center 1-1

EXECUTIVE SUMMARY

This summary report contains the results of analyses performed on the electrical distribution system for the Hunter Holmes McGuire VA Medical Center – Vault #1 switchgear in Richmond, VA. The purpose of this study is to evaluate existing electrical equipment at this facility. System data and necessary modeling assumptions are provided under Section 8.0.

1. Short-Circuit Analysis Perform a short-circuit study on the electrical distribution system shown in order to determine the available fault current at pertinent locations throughout the distribution system. The scope of the study includes:

• Analysis beginning at the main switchgear 13.2 kV, feeder 1 and 2, continuing through the medium and low voltage substations, and ending at the low voltage panelboards and motor control centers as shown in Section 14.0 drawings.

The available fault currents determined by the short-circuit study will be used in the electrical distribution analyses.

2. Equipment Evaluation Evaluate the short-circuit ratings of protective devices and other distribution equipment found at the locations shown in the Oneline drawings.

3. Coordination Study Develop time-current coordination plots to derive coordinated settings for protective devices at Vault #1 switchgear or fed by it.

4. Selective Coordination Study Efforts were made to provide the best coordination possible; according to the NEC the overcurrent protection devices shall be coordinated down to 0.1 sec for the Essential system in Healthcare.

Review the selection of protective devices within the portion of the distribution system require to be coordinated down to 0.1 seconds. Utilize time current curves to verify selective coordination.

5. Arc Flash Analysis Perform an arc flash incident energy analysis per NFPA 70E on the electrical distribution system as per Eaton’s scope of work.

An incident energy analysis is defined by NFPA 70E to be a component of an arc flash risk assessment used to predict the incident energy of an arc flash for a specified set of conditions.

H.H. McGuire VA Medical Center 1-2

6. Load Flow Study Analysis Perform an analysis of a power system’s capability to supply the electrical load under steady state operating conditions.

7. Recommendations Provide specific recommendations for improving the electrical distribution system performance and correcting any deficiencies found by the studies.

1. Short-Circuit Study The system was modeled for worst-case fault currents. Short-circuit currents were calculated for a three-phase bolted fault and single-line-to-ground fault at each bus shown on the one-line diagrams found in Section 14.0.

Cases for normal and emergency operation are evaluated. See Section 2.0, Section 9.0, and Section 10.0 for more information.

2. Equipment Evaluation The Equipment Evaluation is based on the power system worst-case short-circuit current configuration. The short-circuit ratings of protective devices and other distribution equipment are evaluated in Section 2.0, Tables 2.1, 2.2, 2.3, and 2.4.

In summary of the tables listed above, specific equipment has failed the equipment evaluation and is considered overdutied. It is recommended that the overdutied equipment be reviewed for breaker and/or panelboard replacement/modification to comply with the short-circuit current ratings required. The following equipment has failed the equipment evaluation:

• PNL EEP1L-V1R

• PNL EEPDOZ-V1R

• PNL ESPDOZ-V1R

• PNL P1LA-V1R

• PNL PD2L-V1L

• PNL PD1L-V1R

• PNL PDOK-V1L

• PNL POKA-V1L

The short-circuit withstand ratings of low voltage disconnect switches are not evaluated in this study. Care should be taken in order to ensure that these devices are applied within their UL listed short-circuit withstand ratings. The typical withstand ratings for Eaton disconnect switches (safety switches) range from 10,000A to 200,000A for certain fused types.

See Section 2.0 for detailed analysis and evaluation results.

3. Coordination Study The time-current coordination plots of the protective overcurrent devices are shown in Section 3.0. In developing the device settings, consideration was given to the isolation of faults, protection of cables, and protection of transformers.

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Efforts were made to provide the best coordination possible with the existing protective devices. It should be understood that selective coordination between two instantaneous trip units cannot be achieved for fault levels above the instantaneous pickup of the upstream device. There is some overlapping of curves that cannot be avoided.

In summary of the coordination study, the following recommended changes would maximize coordination while maintaining adequate protection:

• Vault 1L TCC 006: Panel PDOZB feeder breaker overlaps with switchgear Vault 1 main and tie breakers above 0.1 sec. Recommended settings are provided for the main, tie, and PDOZB feeder breakers to achieve better coordination.

• Vault 1L TCC 020: Panel PDOZB main and panel POZE feeder breakers do not coordinate with the upstream breakers and cannot be adjusted due to their characteristics. Breakers should be replaced in order to accomplish coordination. Recommended settings are provided for both breakers to improve coordination; however, overlap cannot be avoided with the upstream breakers.

• Vault 1L TCC 037: Panel LOZB feeder overlaps with transformer TOZ feeder breaker. Adjustments to achieve proper coordination is not possible due to the characteristics of these breakers. Electronic trip units are recommended in order to achieve proper coordination with upstream and downstream protective devices.

• Vault 1L TCC 038: Panel LOZA largest breaker does not coordinate with the upstream feeder breaker in the short region. If this is deemed a concern, panel LOZA feeder breaker should be retrofitted with an electronic type breaker.

• Vault 1L TCC 042: Panel P2LA largest breaker overlaps with P2LA feeder breaker in the short region. If this is deemed a concern, panel P2LA feeder breaker should be retrofitted with an electronic type breaker.

• Vault 1L TCC 050: Recommended settings are provided for panel PD1M feeder breaker to improve coordination with the downstream breakers.

• Vault 1L TCC 051 and 052: Feeder L1MB overlaps with LD1M main breaker at the overload region with the existing settings; however, recommended settings for L1MB feeder breaker are provided to improve coordination.

• Vault 1L TCC 054: Panel P1MA feeder breaker overlaps with the largest feeder breaker at panel P1MA, and coordination cannot be improved with the exiting breakers due to their characteristics. If this is deemed a concern, panel P1MA feeder breaker should be retrofitted with an electronic type breaker.

• Vault 1L TCC 061: Panel LD1N main breaker overlaps its largest branch breaker at the overload region, and it does not protect T1N transformer accordingly. If this is deemed a concern, panel LD1N main breaker should be retrofitted with an electronic type breaker.

• Vault 1R TCC 002: Panel POMA main and largest branch breaker overlap above 0.1 sec. Due to the thermomagnetic characteristics they cannot be adjusted to improve coordination. If this is deemed a concern, panel POMA main breaker should be retrofitted with an electronic type breaker.

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• Vault 1R TCC 010 AND 011: Recommended settings are provided for panel PDOL feeder breaker; however, its main and largest branch breakers overlap above 0.1 sec. If this is deemed a concern, panel PDOL main breaker should be retrofitted with an electronic type breaker.

• Vault 1R TCC 013: Panel LOLB feeder and largest branch breaker overlap above 0.1 sec. and cannot be adjusted due to their thermomagnetic characteristics. If this is deemed a concern, panel LOLB feeder breaker should be retrofitted with an electronic type breaker.

• Vault 1R TCC 014: Panel POLA feeder and branch breaker overlap above 0.1 sec, in addition to panel PDOL main and branch breaker miscoordination. If this is deemed a concern, an investigation should be performed to change breakers and/ or change panels to achieve coordination.

• Vault 1R TCC 015: Panel POLB presents the same coordination challenges than panel POLA, Vault 1R TCC 014.

• Vault 1R TCC 040: ATS ECPDOZ Normal power feeder breaker overlaps with panel ECPDOZ branch breakers above 0.1 sec. Recommended settings are provided for the ATS feeder breaker to achieve coordination.

• Vault 1R TCC 042: Panel ECL1L branch breaker overlap with the panel feeder breaker and panel ECLDOZ main breaker above 0.1 sec. This issue can produce an outage at 2 panels if a fault happens downstream of panel ECL1L.

If this is deemed a concern, an investigation should be performed to change breakers and/ or change panels to achieve coordination.

• Vault 1R TCC 043: Panel ECL1N branch breaker overlaps with panel feeder breaker above 0.1 sec. If this is deemed a concern, an investigation should be performed to retrofit the feeder breaker to an electronic type. The same coordination issue is observed at panel ECL1M, same TCC applies to it since they have the same breakers.

• Vault 1R TCC 044: panels ECP1L and ECP1M branch breakers overlap with panels feeder breakers above 0.1 sec; furthermore, breakers cannot be adjusted due to their thermal magnetic characteristics. If this is deemed a concern, panels ECP1L and ECP1M feeder breakers should be retrofitted with electronic type breakers.

• Vault 1R TCC 045: Panel ECP1N largest branch breaker overlaps with the feeder breaker above 0.1 sec. In addition, breakers cannot be adjusted due to their thermal magnetic characteristics. If this is deemed a concern, an investigation should be performed to change breakers and/ or change panels to achieve coordination.

• Vault 1R TCC 046: Panel ECPDOZ branch breakers overlap with the upstream Essential feeder breakers above 0.1 sec. and cannot be adjusted to improve coordination. It is recommended to investigate and replace these breakers to achieve proper coordination.

• Vault 1R TCC 051: Panel P1LA largest branch breaker does not coordinate with its feeder breaker above 0.1 sec. If this is deemed a concern, panel P1LA feeder breaker should be retrofitted with an electronic type breaker.

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• Vault 1R TCC 052 through 056: Panel LD1L branch breakers do not coordinate with its main and feeder breakers above 0.1 sec. If this is deemed a concern, an investigation should be performed to retrofit breakers and/ or change panel to achieve coordination.

• Vault 1R TCC 060: Panel ESPDOZ feeder breaker does not coordinate with the branch breakers above 0.1 sec. However, recommended settings are provided to achieve the proper coordination.

• Vault 1R TCC 064: Panel ESLOL, ESLOM, ESL1M, ESL1N feeder and branch breakers do not coordinate above 0.1 sec. Breakers cannot be adjusted due to their thermomagnetic characteristics. If this is deemed a concern, panel ESLDOZ branch breakers should be retrofitted with electronic type breakers, or the panel be retrofitted.

• Vault 1R TCC 065: Panel ESLIM largest breaker does not coordinate with upstream feeder above 0.1 sec. If this is deemed a concern, an investigation should be performed to retrofit breakers and/ or change panel to achieve coordination.

• Vault 1R TCC 066: Panel ESPOL breakers do not coordinate with upstream breaker above 0.1 sec. If this is deemed a concern, an investigation should be performed to retrofit breakers and/ or change panel to achieve coordination.

• Vault 1R TCC 067: Panel ESP1L breakers do not coordinate with upstream feeder breakers above 0.1 sec. If this is deemed a concern, an investigation should be performed to retrofit breakers and/ or change panel to achieve coordination.

• Vault 1R TCC 068: Panel ESP2L breakers do not coordinate with panel ESP1L main breaker above 0.1 sec. If this is deemed a concern, an investigation should be performed to retrofit breakers and/ or change panel to achieve coordination.

• Vault 1R TCC 072: Panel EELOZ breakers do not coordinate with the upstream feeder breaker above 0.1 sec. If this is deemed a concern, an investigation should be performed to retrofit breakers and/ or change panel to achieve coordination.

• Vault 1R TCC 074: Panel EELOM breakers do not coordinate with the upstream feeder breaker above 0.1 sec. If this is deemed a concern, an investigation should be performed to retrofit breakers and/ or change panel to achieve coordination.

• Vault 1R TCC 075: Panel EEL1N breakers do not coordinate with the upstream feeder breaker above 0.1 sec. If this is deemed a concern, an investigation should be performed to retrofit breakers and/ or change panel to achieve coordination.

• Vault 1R TCC 076: Panel EELOL breakers do not coordinate with the upstream feeder breaker above 0.1 sec. If this is deemed a concern, an investigation should be performed to retrofit breakers and/ or change panel to achieve coordination.

• Vault 1R TCC 078: Panel EEPOZ breakers do not coordinate with the upstream feeder breaker above 0.1 sec. If this is deemed a concern, an

H.H. McGuire VA Medical Center 1-6 investigation should be performed to retrofit breakers and/ or change panel to achieve coordination.

• Vault 1R TCC 079: Panel EEPOL breakers do not coordinate with the upstream feeder breaker above 0.1 sec. If this is deemed a concern, an investigation should be performed to retrofit breakers and/ or change panel to achieve coordination. The following panels present the same issue: Panels EEPOM, EEP1M, and EEP1N.

• Vault 1R TCC 083: Panel EEL breakers do not coordinate with the upstream feeder breaker above 0.1 sec. If this is deemed a concern, an investigation should be performed to retrofit breakers and/ or change panel to achieve coordination.

All of the adjustable low voltage electronic trip and thermal magnetic circuit breakers and medium voltage equipment should be tested and adjusted according to the recommended settings given in Section 5.0.

4. Selective Coordination Evaluation Panels listed above, coordination study, fail to coordinate to 0.1 sec. Recommended settings are provided to achieve coordination for some of them; however, due to their thermos magnetic characteristics some breakers cannot achieve coordination. See above for a complete list of non-coordinated breakers.

See Section 4.0 for further information regarding additional selective coordination details.

5. Protective Device Settings Settings for the protective devices should be set as shown and recommended in Section 5.0.

Each entry references a coordination plot number found in Section 3.0. The referenced plot illustrates the coordination of the listed device with the relevant “upstream” and “downstream” protective devices.

6. Arc Flash Incident Energy Analysis Details of the arc flash incident energy analysis are shown in Section 6.0. Please note for this study, the arc flash hazard has been calculated by performing an incident energy analysis, with the calculation process as specified in IEEE 1584-2018. The results of this study can be used by qualified workers to determine the arc flash boundary and select appropriate arc flash PPE as part of an overall arc flash risk assessment. NFPA 70E provides guidance on the selection of arc rated clothing and other PPE based on the results of an incident energy analysis. It is the responsibility of the employer and qualified person(s) to conduct an overall arc flash risk assessment as detailed in NFPA 70E Article 130.5 before the commencement of work on electrical equipment. The risk associated with performing energized electrical work will vary based on the work being performed as well as the condition of the equipment and other factors that can be best determined by a qualified person in the field.

The PPE requirements outlined in NFPA 70E only address the thermal hazards associated with arc flash events and do not provide protection against other possible

H.H. McGuire VA Medical Center 1-7 physical trauma resulting from an arc flash event. See NFPA 70E Article 120 for details on establishing an electrically safe work condition.

If the incident energy levels at work locations found in this report are unacceptable to the H.H. McGuire VA Medical Center, then those locations should be individually evaluated to determine the most effective means of reducing the incident energy. It is recommended an Arc Flash Mitigation Study be added to the study scope to find the best solution(s) possible to reduce incident energy while maintaining the highest degree of reliability. Also, in some situations the equipment can be upgraded with equipment that is safer by design in order to reduce the risk considering the work being performed.

a) Equipment Design: The following equipment may not reduce calculated incident energy, but is safer by design and can help reduce the risk to the qualified person.

Examples:

• Built in IR windows for low voltage and medium voltage switchgear.

• Remote Racking Device(s).

• Remote “open”/ “close” breaker control.

b) Reducing Incident Energy: The following equipment solutions when applied appropriately can help reduce the calculated incident energy at specific work locations. An Arc Flash Mitigation Study should be included with any of these solutions so design engineering, calculated proof of reduced incident energies, updated arc flash labels, and appropriate device settings can be provided.

Examples:

• Provide low voltage breakers with Arc flash Reduction Maintenance System settings and maintenance switch.

• Provide medium voltage multi-function relays with maintenance switch and separate settings group.

• Revise nonadjustable thermal magnetic breakers or fuses to adjustable electronic trip breakers with Eaton 210+ or 310+ trip units.

• Reduce fuse or breaker size(s) – dependent on existing or expected loading.

• Relocate main breaker or fuse located on transformer secondary to a separate enclosure.

• Provide a bus differential scheme.

• Provide an arc flash limiter (AFL) with current sensing on transformer secondary and vacuum breaker on transformer primary. Voltage transient study should be included for this recommendation with dry type transformers.

• Provide light sensors with Eaton EAFR relay.

c) Arc Flash Training:

Training on arc flash safety, the proper identification and use of the results of this report, and on the use of arc flash labels is recommended. NFPA 70E recommends workers receive periodic training in safety related work practices and the changes associated with 70E at intervals not to exceed three years.

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NFPA 70E requires that the arc flash analysis be updated:

• Every five years (at minimum)

• When the electrical system is modified, including renovations, additions, or subtractions to the system

7. Load Flow Analysis The results of the load flow study analysis are shown in Section 7.0. In summary, a voltage drop higher than 3% for branch circuits, Table 7.2, and 5% for a combination of both feeder and branch circuit, Table 7.1, are consider out of specification and an investigation should be performed.

Because the loads in the model are assumptions, each location where the voltage drop are out of specification should be reviewed further in a more detailed load flow study.

8. Testing and Preventative Maintenance The NFPA 70E Section 205.3 and 205.4 requires that regularly scheduled testing and preventative maintenance be performed to ensure that the electrical distribution equipment continues to perform at an optimum level. Testing should entail primary injection testing of all circuit breakers to verify proper tripping ranges, contact resistance testing, insulation resistance testing and complete switchgear and transformer cleaning and inspection. Refer to NFPA-70B for specific types of testing and interval recommendations. The industry generally performs breaker testing every 3-5 years.

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SHORT-CIRCUIT ANALYSIS

The short-circuit study determines the fault currents that flow in the system during various fault conditions. A system model was created using SKM Systems Analysis software. The calculated fault currents are used in the device evaluation and coordination studies.

NEC Article 110.24(A) requires that service entrance equipment is labeled with the following pieces of information:

• Available fault current

• Date on which the fault current was calculated Article 110.24(B) adds that if there is a modification that may change this fault current value, it must be recalculated. The field marking must be updated to reflect the new value of available fault current. See Section 9.0 and Section 10.0 for the computer generated input data and output data.

Separate “Z” (complex), “X” (reactive), and "R" (resistive) networks are used for the short-circuit analysis. Complex network reduction and the relationship E/Z are used to calculate the fault current magnitude and angle at each faulted bus. The complex equivalent circuit impedance, Z, is calculated by the reduction of the “Z” (complex) network. The X/R ratios calculated for each fault condition are based on the separate reduction of the X and R networks. These X/R ratios are used for the calculation of fault duty multipliers, to evaluate the short-circuit ratings of system components.

The software is capable of generating three types of short-circuit reports for both balanced (three-phase bolted) and unbalanced (line-to-ground) faults. The reports that are generated depend on the system that is being evaluated.

The three types of short-circuit reports are:

• Fault Report (for low voltage)

• Momentary Duty Report (for medium voltage)

• Interrupting Duty Report (for medium voltage)

1. Fault Report The fault currents reported in the “Fault Report” are applicable to low voltage devices and components. The fault currents calculated in this report are based on the contribution data derived from IEEE Std C37.13™. The fault currents are calculated as follows:

• Motor and generator sub transient reactance values (Xd”) are adjusted per the first cycle duty multipliers described in IEEE Std 3002.3™.

• The complex equivalent circuit impedance, Z, is calculated by network reduction of the “Z” (complex) network.

• The momentary symmetrical current = E/Z.

• The X/R ratio is equal to the equivalent circuit reactance, X, divided by the equivalent circuit resistance, R. As discussed above, X is calculated by the

H.H. McGuire VA Medical Center 2-2 reduction of the “X” (reactive) network and R is calculated by the reduction of the “R” (resistive) network.

Multiplying factors are determined, and used to adjust the calculated symmetrical fault current. The adjusted current is used to evaluate low voltage protective devices. Low voltage output algorithms and output reports reflect NEMA AB-1 molded case breaker de-rating multipliers. Breakers are de-rated for circuits where the power factor is lower than the NEMA test circuit (higher X/R ratio). The multipliers adjust the symmetrical fault current to the value associated with the systems fault point X/R ratio. The adjusted value listed on the report may then be compared directly with the manufacturer's published interrupting rating.

2. Momentary Duty Report The “Momentary Duty Report” contains the calculated fault currents that occur during the first half-cycle of the fault. The momentary fault currents are used to evaluate medium and high voltage fuses, and the “closing and latching” capability (momentary rating) of medium and high voltage breakers. The fault currents reported in the “Momentary Duty Report” are calculated as follows:

• Motor and generator sub transient reactance values (Xd”) are adjusted per the first cycle duty multipliers described in IEEE Std 3002.3.

• The complex equivalent circuit impedance, Z, is calculated by network reduction of the “Z” (complex) network.

• The momentary symmetrical current = E/Z.

• The X/R ratio reported is equal to the equivalent circuit reactance, X, divided by the equivalent circuit resistance, R. As discussed above, X is calculated by the reduction of the “X” (reactive) network and R is calculated by the reduction of the “R” (resistive) network.

• The momentary asymmetrical current is calculated and reported in two different ways, once as “sym*1.6” and again as “momentary based on X/R”. The “sym*1.6” value is the momentary symmetrical current multiplied by 1.6. The “momentary based on X/R” value is the momentary symmetrical current multiplied by

( )( )e RX21 2+ − π

3. Interrupting Duty Report The fault currents reported in the “Interrupting Duty Report” are used to evaluate the interrupting rating of medium- and high-voltage breakers. The interrupting symmetrical current is calculated as follows:

• Motor and generator sub transient reactance values (Xd”) are adjusted per the interrupting duty multipliers described in IEEE Std 3002.3.

• The complex equivalent circuit impedance, Z, is calculated by network reduction of the “Z” (complex) network.

• The interrupting symmetrical current = E/Z.

• The X/R ratio reported is equal to the equivalent circuit reactance, X, divided by the equivalent circuit resistance, R. As discussed above, X is calculated by the

H.H. McGuire VA Medical Center 2-3 reduction of the “X” (reactive) network and R is calculated by the reduction of the “R” (resistive) network.

• The calculated X/R ratio is used to determine the minimum contact parting time multiplying factors for 2, 3, 5, and 8 cycle breakers. The multiplying factors are based on IEEE Std C37.5™ and IEEE Std C37.010™ standards. The multiplying factors are applied to the interrupting symmetrical current in order to calculate the RMS short-circuit current interrupting duty for 2, 3, 5, and 8 cycle breakers. This duty is compared to the symmetrical current interrupting rating of the circuit breaker. NACD (No AC Decrement) ratios are calculated with consideration of generator "Local" and "Remote" contributions as outlined in IEEE Std C37.010™.

• Motor and generator impedance multipliers for the short-circuit calculations are summarized in the following table. This is based on the recommended combination network for comprehensive multi-voltage system calculations (from IEEE Std 3002.3:

Machine Type Impedance

(First Cycle Duty) Impedance

(Interrupting Duty)

Turbine generators, Condensers, Hydrogenerators with amortisseur windings

1.0 Xd" 1.0 Xd"

Synchronous motors 1.0 Xd" 1.5 Xd"

Induction motors > 1000 hp at speed ≤ 1800 RPM, or > 250 hp at 3600 RPM.

1.0 Xd" 1.5 Xd"

Induction motors ≥ 50 hp not covered above. 1.2 Xd" 3.0 Xd"

Induction motors < 50 hp 1.67 Xd" Neglect

Note: Xd" is the sub transient reactance of the rotating machine.

The objective of the short-circuit analysis is to calculate the maximum short-circuit currents produced by balanced three-phase and unbalanced faults at each bus shown on the one-line diagrams.

1. Short-Circuit System Model The system was modeled for worst-case fault currents. Short-circuit currents were calculated for a three-phase bolted fault and single-line-to-ground fault at each bus shown on the study one-line diagrams.

a) Evaluated Short-Circuit Cases:

The following short-circuit study cases were evaluated:

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• Study Case No. 1 – System supplied from Hopkins Road utility source. This is the worst-case scenario.

• Study Case No. 2 – System supplied from Broad Rock utility source.

• Study Case No. 3 – System supplied from Emergency generators.

• Study Case No. 4 – System supplied from utility and Emergency generators while ATS in closed transition.

For closed transition type automatic transfer switches which parallel more than one voltage source, even for a short time (< 100 ms), the available fault currents of the two sources have been considered for a combined fault current value that represents the contribution from both sources. NEC Article 110.9 states that equipment which is used to interrupt a fault must be properly rated for both the nominal voltage and the available fault current at the line side of that device. Furthermore, NEC Article 705.16 states that all fault currents from all power sources must be considered when examining the interrupting rating of a device. Location of the analyzed fault with respect to the switching devices, such as circuit breakers, was taken into consideration when determining the appropriate device interrupting current ratings.

The purpose of the equipment evaluation is to compare the maximum calculated short-circuit currents to the short-circuit ratings of protective devices. The comparison is made in order to determine if the device can interrupt or withstand the available fault currents of the electrical system to which the device is applied, as required by NEC Articles 110.9 and 110.10. The device evaluation follows the evaluation procedures outlined in IEEE Std C37.13, IEEE Std C37.010, IEEE Std C37.5, IEEE Std C37.41™, IEEE Std 3004.5™, and applicable ANSI, NEMA, and UL standards.

The results of the short-circuit equipment evaluation are summarized in Table 2.1, 2.2, 2.3, and 2.4. The tables indicates “Bus I.D.” (corresponds to bus designations used in the one-line diagrams), “Manufacturer”, “Status” (Pass, fail, unknown, or marginal), “Type” (equipment category), “Equip Volts”, calculated short-circuit duty, the equipment short-circuit rating, the series rating (if applicable), and the maximum duty rating.

The maximum duty rating is calculated by:

RatingCDeviceS dutyCS

If the short-circuit rating of a device is not known, and/or short-circuit rating information is not available, a Minimum Required short-circuit rating is listed. For equipment with series ratings, the maximum duty rating is calculated using the series rating instead of the individual device short-circuit rating. All short-circuit current values are reported in units of kA.

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1. For low voltage devices:

The calculated short-circuit duty is reported under “Calc Isc (kA)" and the device short-circuit rating is reported under "Equip Isc (kA)". The calculated duty has been adjusted accordingly per the system X/R and device test X/R.

2. For medium/high voltage breakers:

The calculated interrupting short-circuit duty is reported under "Calc Isc (kA)" and the breaker short-circuit interrupting rating is reported under "Equip Isc (kA)". The interrupting duty has been adjusted per multiplying factors based on the breaker clearing time and system X/R. The calculated momentary duty (i.e. close-and-latch duty) is reported under "Calc Mom (kA)". The breaker momentary (i.e. close-and-latch) rating is reported under "Equip Msc (kA)".

3. For medium/high voltage fuses, switches, and motor starters:

The calculated momentary symmetrical short-circuit duty is reported under "Calc Isc (kA)" and the device's momentary symmetrical short-circuit rating is reported under "Equip Isc (kA)". The calculated momentary asymmetrical duty is reported under "Calc Mom (kA)". The device's momentary asymmetrical short-circuit rating is reported under "Equip Mom (kA)".

Information used in modeling the power system to provide conservative, worst-case results is listed in Section 9.0. The results of the short-circuit analysis, including calculated branch contributions, are provided under Section 10.0. The one-line diagrams with referenced bus identification are included in Section 14.0.

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Table 2.1 – Low-Voltage Equipment Evaluation (Hopkins Rd Utility contribution)

Bus Status Manufacturer Type Bus Calc Dev Isc

Voltage Isc kA Isc kA Rating% ATS-EZ (LOAD) Passed ASCO LV ATS 480 14.05 35.00 40.13 ATS-SZ (LOAD) Passed ASCO LV ATS 480 15.44 35.00 44.11 ATSCZ (LOAD) V1R Passed ASCO LV ATS 480 14.63 35.00 41.81 EEL-PNL Passed FPE LV Panelboard 480 1.73 14.00 12.33 LOZC-PNL-V1L Passed EATON LV Panelboard 208 2.81 (*N1) 10.00 28.08 LOZD-PNL-V1L Passed EATON LV Panelboard 208 2.82 (*N1) 10.00 28.18 PDOZ-B-PNL-V1L Passed EATON LV Panelboard 480 17.76 (*N1) 50.00 35.51 PNL LDOM-V1L Passed FPE LV Panelboard 208 4.82 18.00 26.79 PNL ECL1L-V1R Passed FPE LV Panelboard 208 1.34 18.00 7.44 PNL ECL1M-V1R Passed FPE LV Panelboard 208 0.98 25.00 3.93 PNL ECL1N-V1R Passed FPE LV Panelboard 208 1.34 14.00 9.55 PNL ECLDOZ-V1R Passed FPE LV Panelboard 208 1.95 14.00 13.96 PNL ECP1L-V1R Passed FPE LV Panelboard 480 5.09 14.00 36.35 PNL ECP1M-V1R Passed FPE LV Panelboard 480 1.45 14.00 10.38 PNL ECP1N-V1R Passed FPE LV Panelboard 480 2.74 14.00 19.55 PNL ECPDOZ-V1R Passed FPE LV Panelboard 480 14.16 25.00 56.63 PNL EEL1L-V1R Passed FPE LV Panelboard 208 3.33 18.00 18.51 PNL EEL1M-V1R Passed FPE LV Panelboard 208 1.86 25.00 7.44 PNL EEL1N-V1R Passed FPE LV Panelboard 208 2.15 14.00 15.38 PNL EEL2L-V1R Passed FPE LV Panelboard 208 3.16 25.00 12.66 PNL EELDOZ-V1R Passed FPE LV Panelboard 208 4.82 18.00 26.77 PNL EELOL-V1R Passed FPE LV Panelboard 208 2.39 25.00 9.54 PNL EELOM-V1R Passed FPE LV Panelboard 208 1.96 25.00 7.83 PNL EELOZ-V1R Passed FPE LV Panelboard 208 4.65 18.00 25.81 PNL EEP1L-V1R Passed FPE LV Panelboard 480 10.67 14.00 76.24 PNL EEP1M-V1R Passed FPE LV Panelboard 480 1.84 14.00 13.17 PNL EEP1N-V1R Passed FPE LV Panelboard 480 1.73 14.00 12.33 PNL EEP2L-V1R Passed FPE LV Panelboard 480 7.44 14.00 53.17 PNL EEPDOZ-V1R Passed FPE LV Panelboard 480 13.79 14.00 98.50 PNL EEPOL-V1R Passed GE LV Panelboard 480 5.10 25.00 20.39 PNL EEPOM-V1R Passed FPE LV Panelboard 480 1.98 14.00 14.13 PNL EEPOZ-V1R Passed FPE LV Panelboard 480 7.81 14.00 55.78

H.H. McGuire VA Medical Center 2-7

Voltage Isc kA Isc kA Rating%

PNL ESL1L-V1R Passed FPE LV Panelboard 208 2.24 18.00 12.43 PNL ESL2L-V1R Passed FPE LV Panelboard 208 2.08 25.00 8.34 PNL ESLDOZ-V1R Passed FPE LV Panelboard 208 2.89 14.00 20.61 PNL ESLIM-V1R Passed FPE LV Panelboard 208 2.73 25.00 10.91 PNL ESLIN-V1R Passed FPE LV Panelboard 208 2.73 14.00 19.48 PNL ESLOL-V1R Passed FPE LV Panelboard 208 1.84 25.00 7.37 PNL ESLOM-V1R Passed FPE LV Panelboard 208 1.24 25.00 4.95 PNL ESP1L-V1R Passed FPE LV Panelboard 480 9.67 14.00 69.09 PNL ESP1M-V1R Passed FPE LV Panelboard 480 1.49 14.00 10.65 PNL ESP1N-V1R Passed FPE LV Panelboard 480 2.80 14.00 19.97 PNL ESP2L-V1R Passed FPE LV Panelboard 480 8.56 14.00 61.17 PNL ESPDOZ-V1R Passed FPE LV Panelboard 480 15.17 22.00 68.97 PNL ESPOL-V1R Passed FPE LV Panelboard 480 6.25 14.00 44.62 PNL ESPOM-V1R Passed FPE LV Panelboard 480 1.58 14.00 11.30 PNL L1LA-V1R Passed FPE LV Panelboard 208 3.87 25.00 15.49 PNL L1LB-V1R Passed FPE LV Panelboard 208 2.48 18.00 13.76 PNL L1LC-V1R Passed FPE LV Panelboard 208 2.92 18.00 16.24 PNL L1LD-V1R Passed SQUARE D LV Panelboard 208 3.97 (*N1) 10.00 39.66 PNL L1MA-V1L Passed FPE LV Panelboard 208 3.58 18.00 19.90 PNL L1MB-V1L Passed FPE LV Panelboard 208 3.60 25.00 14.41 PNL L1NA-V1L Passed FPE LV Panelboard 208 3.63 18.00 20.15 PNL L1NB-V1L Passed FPE LV Panelboard 208 3.65 25.00 14.61 PNL L1NC-V1L Passed FPE LV Panelboard 208 1.93 18.00 10.73 PNL L2LA-V1L Passed FPE LV Panelboard 208 2.21 25.00 8.83 PNL LD1L-V1R Passed FPE LV Panelboard 208 4.14 18.00 22.98 PNL LD1M-V1L Passed FPE LV Panelboard 208 3.77 25.00 15.07 PNL LD1N-V1L Passed FPE LV Panelboard 208 3.85 18.00 21.41 PNL LD2L-V1L Passed FPE LV Panelboard 208 2.27 18.00 12.59 PNL LDOK-V1L Passed FPE LV Panelboard 208 0.63 14.00 4.50 PNL LDOK-V1R Passed FPE LV Panelboard 208 3.63 14.00 25.91 PNL LDOL-V1R Passed FPE LV Panelboard 208 2.31 18.00 12.84 PNL LDOZ-V1L Passed FPE LV Panelboard 208 2.31 18.00 12.82

H.H. McGuire VA Medical Center 2-8

Voltage Isc kA Isc kA Rating%

PNL LOLA-V1R Passed FPE LV Panelboard 208 2.28 25.00 9.11 PNL LOLB-V1R Passed SQUARE D LV Panelboard 208 0.89 10.00 8.95 PNL LOMA-V1L Passed FPE LV Panelboard 208 4.36 25.00 17.45 PNL LOMB-V1L Passed FPE LV Panelboard 208 3.82 18.00 21.22 PNL LOMC-V1L Passed FPE LV Panelboard 208 3.57 18.00 19.83 PNL LOMD-V1L Passed FPE LV Panelboard 208 3.25 18.00 18.04 PNL LOME-V1L Passed FPE LV Panelboard 208 3.04 18.00 16.91 PNL LOMF-V1L Passed FPE LV Panelboard 208 2.83 18.00 15.74 PNL LOMG-V1L Passed FPE LV Panelboard 208 2.77 18.00 15.39 PNL LOZA-V1L Passed FPE LV Panelboard 208 2.27 25.00 9.07 PNL LOZB-V1L Passed FPE LV Panelboard 208 1.74 18.00 9.69 PNL P1LA-V1R Passed FPE LV Panelboard 480 13.33 14.00 95.24 PNL P1MA-V1L Passed FPE LV Panelboard 480 7.97 14.00 56.92 PNL P1NA-V1L Passed FPE LV Panelboard 480 8.36 14.00 59.71 PNL P2LA-V1L Passed FPE LV Panelboard 480 12.45 14.00 88.90 PNL PD1L-V1R Failed FPE LV Panelboard 480 *14.43 (*N1) 14.00 *103.07 PNL PD1M-V1L Passed FPE LV Panelboard 480 8.46 14.00 60.43 PNL PD1N-V1L Passed FPE LV Panelboard 480 8.84 14.00 63.12 PNL PD2L-V1L Failed FPE LV Panelboard 480 *14.52 14.00 *103.68 PNL PDOK-V1L Failed FPE LV Panelboard 480 *18.47 (*N1) 14.00 *131.89 PNL PDOL-V1R Passed FPE LV Panelboard 480 14.68 (*N1) 25.00 58.73 PNL PDOM-V1R Passed FPE LV Panelboard 480 8.87 14.00 63.38 PNL PDOZ-V1L Passed FPE LV Panelboard 480 14.21 22.00 64.58 PNL POKA-V1L Failed FPE LV Panelboard 480 *14.46 14.00 *103.27 PNL POLA - V1R Passed FPE LV Panelboard 480 13.23 25.00 52.93 PNL POLB-V1R Passed FPE LV Panelboard 480 7.64 18.00 42.43 PNL POMA-V1R Passed FPE LV Panelboard 480 8.73 25.00 34.91 PNL POMB-V1R Passed FPE LV Panelboard 480 6.89 25.00 27.56 PNL POZA-V1L Passed FPE LV Panelboard 480 13.54 22.00 61.54 PNL POZB-V1L Passed FPE LV Panelboard 480 10.96 14.00 78.26

H.H. McGuire VA Medical Center 2-9

Voltage Isc kA Isc kA Rating%

PNL POZC-V1L Passed FPE LV Panelboard 480 6.85 18.00 38.05 PNL POZD-V1L Passed FPE LV Panelboard 480 6.85 14.00 48.93 PNL POZE-V1L Passed FPE LV Panelboard 480 12.08 14.00 86.29 POZD-PNL-V1L Passed EATON LV Panelboard 480 11.70 14.00 83.56 POZE-PNL-V1L Passed EATON LV Panelboard 480 12.65 (*N1) 14.00 90.39 POZF-PNL-V1L Passed EATON LV Panelboard 480 11.19 14.00 79.90 SWGR S1L-V1L Passed FPE LV Switchgear 480 19.13 30.00 63.76 SWGR S1R BLDG 500 Passed FPE LV Switchgear 480 20.98 30.00 69.93

(*N1) System X/R higher than Test X/R, Calc Isc (kA) modified based on low voltage factor.

Bus Calc Dev Isc Calc Dev Mom

Voltage Isc kA Isc kA Rating% Mom kA Mom kA Rating%

PRI MVS-US 1A1 BLDG 500 Passed FEDERAL PACIFIC MV SWITCH 13200 5.53 60.00 9.21 8.31 60.00 13.84

PRI MVS-US 1A2 BLDG 500 Passed FEDERAL PACIFIC MV SWITCH 13200 5.53 60.00 9.21 8.30 60.00 13.84

PRI MVS-US 1B1 BLDG 500 Passed FEDERAL PACIFIC MV SWITCH 13200 5.51 60.00 9.19 8.25 60.00 13.74

PRI MVS-US 1B2 BLDG 500 Passed FEDERAL PACIFIC MV SWITCH 13200 5.51 60.00 9.19 8.24 60.00 13.74

H.H. McGuire VA Medical Center 2-10

Table 2.2 – Low-Voltage Equipment Evaluation ( Broad Rock contribution)

Bus Status Manufacturer Type Bus Calc Dev Isc

Voltage Isc kA Isc kA Rating% ATS-EZ (LOAD) Passed ASCO LV ATS 480 14.19 35.00 40.53 ATS-SZ (LOAD) Passed ASCO LV ATS 480 15.62 35.00 44.62 ATSCZ (LOAD) V1R Passed ASCO LV ATS 480 14.77 35.00 42.19 EEL-PNL Passed FPE LV Panelboard 480 1.73 14.00 12.34 LOZC-PNL-V1L Passed EATON LV Panelboard 208 2.81 (*N1) 10.00 28.10 LOZD-PNL-V1L Passed EATON LV Panelboard 208 2.82 (*N1) 10.00 28.20 PDOZ-B-PNL-V1L Passed EATON LV Panelboard 480 17.97 (*N1) 50.00 35.95 PNL LDOM-V1L Passed FPE LV Panelboard 208 4.83 18.00 26.84 PNL ECL1L-V1R Passed FPE LV Panelboard 208 1.34 18.00 7.44 PNL ECL1M-V1R Passed FPE LV Panelboard 208 0.98 25.00 3.93 PNL ECL1N-V1R Passed FPE LV Panelboard 208 1.34 14.00 9.56 PNL ECLDOZ-V1R Passed FPE LV Panelboard 208 1.96 14.00 13.97 PNL ECP1L-V1R Passed FPE LV Panelboard 480 5.10 14.00 36.43 PNL ECP1M-V1R Passed FPE LV Panelboard 480 1.45 14.00 10.38 PNL ECP1N-V1R Passed FPE LV Panelboard 480 2.74 14.00 19.56 PNL ECPDOZ-V1R Passed FPE LV Panelboard 480 14.28 25.00 57.13 PNL EEL1L-V1R Passed FPE LV Panelboard 208 3.33 18.00 18.53 PNL EEL1M-V1R Passed FPE LV Panelboard 208 1.86 25.00 7.44 PNL EEL1N-V1R Passed FPE LV Panelboard 208 2.15 14.00 15.39 PNL EEL2L-V1R Passed FPE LV Panelboard 208 3.17 25.00 12.67 PNL EELDOZ-V1R Passed FPE LV Panelboard 208 4.83 18.00 26.81 PNL EELOL-V1R Passed FPE LV Panelboard 208 2.39 25.00 9.55 PNL EELOM-V1R Passed FPE LV Panelboard 208 1.96 25.00 7.83 PNL EELOZ-V1R Passed FPE LV Panelboard 208 4.65 18.00 25.84 PNL EEP1L-V1R Passed FPE LV Panelboard 480 10.77 14.00 76.95 PNL EEP1M-V1R Passed FPE LV Panelboard 480 1.85 14.00 13.18 PNL EEP1N-V1R Passed FPE LV Panelboard 480 1.73 14.00 12.34 PNL EEP2L-V1R Passed FPE LV Panelboard 480 7.48 14.00 53.46 PNL EEPDOZ-V1R Passed FPE LV Panelboard 480 13.92 14.00 99.45

H.H. McGuire VA Medical Center 2-11

Voltage Isc kA Isc kA Rating%

PNL EEPOL-V1R Passed GE LV Panelboard 480 5.11 25.00 20.44 PNL EEPOM-V1R Passed FPE LV Panelboard 480 1.98 14.00 14.14 PNL EEPOZ-V1R Passed FPE LV Panelboard 480 7.85 14.00 56.05 PNL ESL1L-V1R Passed FPE LV Panelboard 208 2.24 18.00 12.44 PNL ESL2L-V1R Passed FPE LV Panelboard 208 2.09 25.00 8.34 PNL ESLDOZ-V1R Passed FPE LV Panelboard 208 2.89 14.00 20.63 PNL ESLIM-V1R Passed FPE LV Panelboard 208 2.73 25.00 10.92 PNL ESLIN-V1R Passed FPE LV Panelboard 208 2.73 14.00 19.49 PNL ESLOL-V1R Passed FPE LV Panelboard 208 1.84 25.00 7.38 PNL ESLOM-V1R Passed FPE LV Panelboard 208 1.24 25.00 4.96 PNL ESP1L-V1R Passed FPE LV Panelboard 480 9.74 14.00 69.60 PNL ESP1M-V1R Passed FPE LV Panelboard 480 1.49 14.00 10.65 PNL ESP1N-V1R Passed FPE LV Panelboard 480 2.80 14.00 19.99 PNL ESP2L-V1R Passed FPE LV Panelboard 480 8.62 14.00 61.55 PNL ESPDOZ-V1R Passed FPE LV Panelboard 480 15.34 22.00 69.74 PNL ESPOL-V1R Passed FPE LV Panelboard 480 6.27 14.00 44.76 PNL ESPOM-V1R Passed FPE LV Panelboard 480 1.58 14.00 11.31 PNL L1LA-V1R Passed FPE LV Panelboard 208 3.88 25.00 15.51 PNL L1LB-V1R Passed FPE LV Panelboard 208 2.48 18.00 13.77 PNL L1LC-V1R Passed FPE LV Panelboard 208 2.93 18.00 16.25 PNL L1LD-V1R Passed SQUARE D LV Panelboard 208 3.97 (*N1) 10.00 39.69 PNL L1MA-V1L Passed FPE LV Panelboard 208 3.59 18.00 19.92 PNL L1MB-V1L Passed FPE LV Panelboard 208 3.61 25.00 14.42 PNL L1NA-V1L Passed FPE LV Panelboard 208 3.63 18.00 20.17 PNL L1NB-V1L Passed FPE LV Panelboard 208 3.66 25.00 14.63 PNL L1NC-V1L Passed FPE LV Panelboard 208 1.93 18.00 10.74 PNL L2LA-V1L Passed FPE LV Panelboard 208 2.21 25.00 8.83 PNL LD1L-V1R Passed FPE LV Panelboard 208 4.14 18.00 23.00 PNL LD1M-V1L Passed FPE LV Panelboard 208 3.77 25.00 15.08 PNL LD1N-V1L Passed FPE LV Panelboard 208 3.86 18.00 21.43 PNL LD2L-V1L Passed FPE LV Panelboard 208 2.27 18.00 12.60 PNL LDOK-V1L Passed FPE LV Panelboard 208 0.63 14.00 4.50

H.H. McGuire VA Medical Center 2-12

Voltage Isc kA Isc kA Rating%

PNL LDOK-V1R Passed FPE LV Panelboard 208 3.63 14.00 25.93 PNL LDOL-V1R Passed FPE LV Panelboard 208 2.31 18.00 12.85 PNL LDOZ-V1L Passed FPE LV Panelboard 208 2.31 18.00 12.83 PNL LOLA-V1R Passed FPE LV Panelboard 208 2.28 25.00 9.12 PNL LOLB-V1R Passed SQUARE D LV Panelboard 208 0.89 10.00 8.95 PNL LOMA-V1L Passed FPE LV Panelboard 208 4.37 25.00 17.47 PNL LOMB-V1L Passed FPE LV Panelboard 208 3.82 18.00 21.24 PNL LOMC-V1L Passed FPE LV Panelboard 208 3.57 18.00 19.85 PNL LOMD-V1L Passed FPE LV Panelboard 208 3.25 18.00 18.05 PNL LOME-V1L Passed FPE LV Panelboard 208 3.05 18.00 16.92 PNL LOMF-V1L Passed FPE LV Panelboard 208 2.84 18.00 15.75 PNL LOMG-V1L Passed FPE LV Panelboard 208 2.77 18.00 15.40 PNL LOZA-V1L Passed FPE LV Panelboard 208 2.27 25.00 9.08 PNL LOZB-V1L Passed FPE LV Panelboard 208 1.75 18.00 9.70 PNL P1LA-V1R Passed FPE LV Panelboard 480 13.49 14.00 96.32 PNL P1MA-V1L Passed FPE LV Panelboard 480 8.03 14.00 57.36 PNL P1NA-V1L Passed FPE LV Panelboard 480 8.43 14.00 60.19 PNL P2LA-V1L Passed FPE LV Panelboard 480 12.55 14.00 89.68 PNL PD1L-V1R Failed FPE LV Panelboard 480 *14.58 (*N1) 14.00 *104.12 PNL PD1M-V1L Passed FPE LV Panelboard 480 8.53 14.00 60.94 PNL PD1N-V1L Passed FPE LV Panelboard 480 8.91 14.00 63.67 PNL PD2L-V1L Failed FPE LV Panelboard 480 *14.68 14.00 *104.85 PNL PDOK-V1L Failed FPE LV Panelboard 480 *18.68 (*N1) 14.00 *133.43 PNL PDOL-V1R Passed FPE LV Panelboard 480 14.84 (*N1) 25.00 59.34 PNL PDOM-V1R Passed FPE LV Panelboard 480 8.94 14.00 63.88 PNL PDOZ-V1L Passed FPE LV Panelboard 480 14.37 22.00 65.34 PNL POKA-V1L Failed FPE LV Panelboard 480 *14.61 14.00 *104.39 PNL POLA - V1R Passed FPE LV Panelboard 480 13.35 25.00 53.42 PNL POLB-V1R Passed FPE LV Panelboard 480 7.68 18.00 42.65 PNL POMA-V1R Passed FPE LV Panelboard 480 8.79 25.00 35.18 PNL POMB-V1R Passed FPE LV Panelboard 480 6.93 25.00 27.71 PNL POZA-V1L Passed FPE LV Panelboard 480 13.68 22.00 62.20

H.H. McGuire VA Medical Center 2-13

Bus Status Manufacturer Type Bus Calc Dev Isc

Voltage Isc kA Isc kA Rating% PNL POZB-V1L Passed FPE LV Panelboard 480 11.04 14.00 78.89 PNL POZC-V1L Passed FPE LV Panelboard 480 6.89 18.00 38.29 PNL POZD-V1L Passed FPE LV Panelboard 480 6.89 14.00 49.23 PNL POZE-V1L Passed FPE LV Panelboard 480 12.19 14.00 87.08 POZD-PNL-V1L Passed EATON LV Panelboard 480 11.84 14.00 84.55 POZE-PNL-V1L Passed EATON LV Panelboard 480 12.78 (*N1) 14.00 91.30 POZF-PNL-V1L Passed EATON LV Panelboard 480 11.31 14.00 80.77 SWGR S1L-V1L Passed FPE LV Switchgear 480 19.39 30.00 64.64 SWGR S1R BLDG 500 Passed FPE LV Switchgear 480 21.26 30.00 70.88

Table 2.3 – Low-Voltage Equipment Evaluation ( Generator contribution)

Voltage Isc kA Isc kA Rating% ATS-EZ (LOAD) Passed ASCO LV ATS 480 10.72 35.00 30.63 ATS-SZ (LOAD) Passed ASCO LV ATS 480 8.04 35.00 22.98 ATSCZ (LOAD) V1R Passed ASCO LV ATS 480 6.51 35.00 18.60 EEL-PNL Passed FPE LV Panelboard 480 1.68 14.00 11.97 PNL ECL1L-V1R Passed FPE LV Panelboard 208 1.28 18.00 7.14 PNL ECL1M-V1R Passed FPE LV Panelboard 208 0.95 25.00 3.79 PNL ECL1N-V1R Passed FPE LV Panelboard 208 1.28 14.00 9.16 PNL ECLDOZ-V1R Passed FPE LV Panelboard 208 1.87 14.00 13.36 PNL ECP1L-V1R Passed FPE LV Panelboard 480 3.60 14.00 25.74 PNL ECP1M-V1R Passed FPE LV Panelboard 480 1.31 14.00 9.38 PNL ECP1N-V1R Passed FPE LV Panelboard 480 2.26 14.00 16.17 PNL ECPDOZ-V1R Passed FPE LV Panelboard 480 6.42 25.00 25.67 PNL EEL1L-V1R Passed FPE LV Panelboard 208 3.24 18.00 18.02 PNL EEL1M-V1R Passed FPE LV Panelboard 208 1.83 25.00 7.31 PNL EEL1N-V1R Passed FPE LV Panelboard 208 2.11 14.00 15.07 PNL EEL2L-V1R Passed FPE LV Panelboard 208 3.08 25.00 12.34 PNL EELDOZ-V1R Passed FPE LV Panelboard 208 4.68 18.00 26.02

H.H. McGuire VA Medical Center 2-14

Voltage Isc kA Isc kA Rating%

PNL EELOL-V1R Passed FPE LV Panelboard 208 2.33 25.00 9.34 PNL EELOM-V1R Passed FPE LV Panelboard 208 1.92 25.00 7.69 PNL EELOZ-V1R Passed FPE LV Panelboard 208 4.48 18.00 24.90 PNL EEP1L-V1R Passed FPE LV Panelboard 480 8.66 14.00 61.85 PNL EEP1M-V1R Passed FPE LV Panelboard 480 1.79 14.00 12.75 PNL EEP1N-V1R Passed FPE LV Panelboard 480 1.68 14.00 11.97 PNL EEP2L-V1R Passed FPE LV Panelboard 480 6.39 14.00 45.68 PNL EEPDOZ-V1R Passed FPE LV Panelboard 480 10.58 14.00 75.56 PNL EEPOL-V1R Passed GE LV Panelboard 480 4.62 25.00 18.48 PNL EEPOM-V1R Passed FPE LV Panelboard 480 1.91 14.00 13.65 PNL EEPOZ-V1R Passed FPE LV Panelboard 480 6.69 14.00 47.76 PNL ESL1L-V1R Passed FPE LV Panelboard 208 2.14 18.00 11.89 PNL ESL2L-V1R Passed FPE LV Panelboard 208 2.00 25.00 8.00 PNL ESLDOZ-V1R Passed FPE LV Panelboard 208 2.75 14.00 19.65 PNL ESLIM-V1R Passed FPE LV Panelboard 208 2.58 25.00 10.33 PNL ESLIN-V1R Passed FPE LV Panelboard 208 2.58 14.00 18.44 PNL ESLOL-V1R Passed FPE LV Panelboard 208 1.78 25.00 7.12 PNL ESLOM-V1R Passed FPE LV Panelboard 208 1.20 25.00 4.82 PNL ESP1L-V1R Passed FPE LV Panelboard 480 6.18 14.00 44.16 PNL ESP1M-V1R Passed FPE LV Panelboard 480 1.41 14.00 10.06 PNL ESP1N-V1R Passed FPE LV Panelboard 480 2.49 14.00 17.82 PNL ESP2L-V1R Passed FPE LV Panelboard 480 5.73 14.00 40.96 PNL ESPDOZ-V1R Passed FPE LV Panelboard 480 7.98 22.00 36.25 PNL ESPOL-V1R Passed FPE LV Panelboard 480 4.72 14.00 33.71 PNL ESPOM-V1R Passed FPE LV Panelboard 480 1.49 14.00 10.64 PNL…