Arc Flash Study CLC Ph 2.pdf

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SEE TRANSMITTAL FOR INSTRUCTIONS

This submittal has been reviewed only for conformance with the design concept of the Project and compliance with the Information given in the Contract Documents.

It is the Contractor’s contractual duty to review and act upon submittals, prior to their submission to verify that all requirements of the Contract Documents have been met or if they have not been met, to notify the Architect in writing. By the submission of this submittal to the Architect, it is assumed the Contractor has fulfiled these contractual duties. Review of this submittal by Architect does not relieve the Contractor of the duty to meet the requirements of the Contract Documents and the applicable building codes.

Any comments noted or corrections requested are for clarification of the general character of the work. Correctness of details, measurements, quantities, conformity with Contract Documents, techniques of construction and coordination with other trades shall remain the complete responsibility of the General/Prime Contractor.

BY: ------- DATE: ------

EWINGCOLE

15231 Laguna Canyon Road, Suite 200, Irvine, CA 92618

ARCHITECTS ENGINEERS INTERIOR DESIGNERS PLANNERS

ewingcole.comDiscovery Business Center, 15231 Laguna Canyon Road, Suite 200, Irvine, CA 92618 TEL 949.417.7550 FAX 949.585.9391

VA LL CLC Expand Phase II Submittal Review

Electrical Power Study (Division Number 265100 )

Comments:

1. Update conductor lengths for CBL-003 from MDBU to MSB-CLC2 and CBL-0015 from SBCM to CB-EM-CLC2 in accordance with RFI-026. Verify associated electrical values for this power study are still acceptable.

D.Diaz 08/22/2017

SHORT CIRCUIT, PROTECTIVE DEVICE

COORDINATION, & ARC FLASH RISK

ASSESSMENT REPORT

VA Loma Linda Healthcare System Community Living

Center 2 Expansion: Loma Linda, CA

(Engineer of Record)

Reviewed by: Joe Dews, P.E.

Designed by: Michael McKee, P.E.

Date: August 17, 2017

Revision 0

Tables of Contents

1. SUMMARY

1.1. Introduction

1.2. Power System Study Results

1.2.1. Short-Circuit Results

1.2.2. Protective Device Coordination Results

1.2.3. Arc Flash Hazard Analysis Results

1.3. Power System Study Recommendations

1.3.2. Protective Device Coordination Study

1.3.3. Arc Flash Hazard Analysis

2. SHORT CIRCUIT ANALYSIS

2.1. Background and Procedures

2.2. Power System Modeling for Short Circuit Calculations

2.3. Data for Short Circuit Calculations

2.3.2. Power System Data

2.3.3. Assumptions

2.3.4. Short Circuit Analysis Results

3. PROTECTIVE DEVICE COORDINATION STUDY

3.1. Background and Procedures

3.1.1. Coordination Objectives

3.1.2. Coordination Results

3.1.3. Coordination Recommendations

3.1.4. Time Current Characteristic Plots

4. Arc Flash RISK ASSESSMENT

4.1. Background and Analysis

4.2. Results and Recommendations

5. STUDY ONE-LINE DIAGRAM

6. ARC FLASH LABELS

7. SHORT CIRCUIT INPUT/OUTPUT DATA

1. EXECUTIVE SUMMARY

1.1 Introduction

This report details the results of the power system engineering study for the VA

Hospital Community Living Center 2 expansion in Loma Linda, CA. The objective of this section is to briefly summarize the results of the study and point out critical issues and results. Refer to Sections 2-4 for the study details.

The electrical distribution system for the VA Community Living Center 2 expansion consists of a 600A main distribution switchboard (“MSB-CLC2”) served from a 600A breaker in existing switchboard MDBU. The distribution system also consists of a 250A enclosed circuit breaker (“CB-EM-CLC2”) served from a 250A breaker in existing switchboard SBCM.

See Section 5 for the study one-line diagram.

1.2 Power System Study Results

1.2.1 Short-Circuit Results

Of the nineteen equipment locations evaluated, all were found to have device interrupting ratings appropriate for the maximum three-phase short-circuit current to which they could be subjected. See Section 2 for the short-circuit study results.

1.2.2 Protective Device Coordination Results

Settings recommendations have been made for fourteen adjustable devices to ensure optimum selectivity, reduce arc flash incident energy, and protect equipment. Overall, the coordination study showed that acceptable levels of selectivity were achieved among devices in the system.

The protective devices in the power system should be set as recommended in

Table 3, Section 3 of the report.

1.2.3 Arc Flash Risk Assessment Results

Nineteen locations were analyzed to determine the level of arc flash incident energy to which personnel would be exposed during an arc flash event. All locations were determined to be less than 8 cal/cm2.

As stated in NFPA 70E-2015 Article 130.7(A), Informational Note No. 1 the

PPE requirements of NFPA 70E do not address protection against physical trauma other than the thermal effects of an arc flash. Protection from arc flash hazards can best be provided by working only on circuits or equipment that have been placed in an electrically safe work condition.

1.3 Power System Study Recommendations

1.3.1 Protective Device Coordination Study

All adjustable protective devices should be set per the settings table in Section

3.

1.3.2 Arc Flash Risk Assessment

Per the 2015 edition of NFPA 70E-2015 Article 130.5(2) the arc flash risk assessment shall be updated as follows:

• Intervals not to exceed five years.

• When a major modification or renovation takes place.

It is recommended that a plan is implemented to schedule a review of the arc flash risk assessment for the entire VA Loma Linda campus by 2021 or when a major modification or renovation takes place.

2. SHORT-CIRCUIT ANALYSIS

2.1 Background and Procedures

A power system short-circuit analysis is used for the following:

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

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

• To verify the ability of equipment such as disconnect switches and plug-in busduct, to withstand the effects of the calculated maximum fault current levels.

• To assist in the selection and/or determination of settings for relays and circuit breakers.

• To provide input (along with overcurrent device operating characteristics) to an arc flash hazard analysis.

This study uses SKM power system analysis software to calculate the maximum available three-phase, RMS symmetrical, short-circuit amperes at each equipment location in the system. The calculation procedures are based on recommendations included in ANSI/IEEE standards C37.13, C37.010, and C37.5.

The equipment evaluation provided in Table 2 compares the short circuit current rating (SCCR) of the protective devices to the available fault current at each equipment location in the electrical distribution system. The interrupting rating of the protective devices must be greater than the calculated fault current available at the equipment location to pass the equipment evaluation. When the criteria limits are met the equipment evaluation status is set to “pass”. However, when the limits are exceeded the status is set to “fail” and these devices are over-dutied. The equipment evaluation is essential to determine if the breakers are rated to operate safely to interrupt and isolate fault currents with minimal disruption to the overall power system.

NEC section 110.9 requires protective devices to have interrupting ratings sufficient to handle the available fault current at the line terminals of the equipment. For locations where the calculated fault currents exceed the interrupting ratings of protective devices, recommendations for corrective action are provided.

For equipment with series ratings, the maximum duty rating is calculated using the series rating rather than the respective device interrupting ratings.

NEC-2017, Article 110.24(A) requires that service entrance equipment is labeled with the following information:

• Maximum 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 maximum fault current.

Equipment short-circuit withstand and protective device interrupting ratings are expressed in symmetrical RMS current. However, power 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 when the fault begins. The level of asymmetry 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 currents is based on the maximum possible asymmetrical fault current level at the point of application in the power system. The more inductive the circuit, as measured by the calculated system X/R ratio, the higher the magnitude of the asymmetrical component. If the calculated X/R ratio exceeds a specified value, then the increased asymmetrical duty must be considered when breaker ratings are evaluated.

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 UL and ANSI product standards. For example, an ANSI low voltage power circuit breaker is tested in a circuit with an X/R ratio of 6.591. If this 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 power circuit 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 increased X/R ratio at the point of application. This resultant fault duty, which is greater than the calculated fault current, is then compared to the breaker’s interrupting rating to determine if the breaker is rated adequately. Different classes of low voltage breakers have different test X/R ratios, and each type has its own set of multiplication factors. Design test circuit power factors and associated X/R ratios are given in Table

1. See IEEE standard 1015-1997 (Blue Book), 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 Ratios for LV Devices

Device Power Factor 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 standard

C37.13. For molded case circuit 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) multiplying factor.

2.2 Power System Modeling for Short Circuit Calculations

Short-circuit currents were calculated for a three-phase bolted fault at each bus shown on the one-line diagram found in Section 5.

To model the system for worst-case fault currents all motor contributions were added.

The following study cases were applied.

• Study Case No. 1 – MDBU as short-circuit source.

• Study Case No. 2 – SBCM as short-circuit source (only used to determine fault duty of CB-EM-CLC2, GUTTER TROUGH, CB-L, CB-C, and CB-EM-CLC1).

2.3 Data for Short Circuit Calculations

2.3.1 Power System Data

Input data for this study was obtained from the following sources:

• Contract drawing E-611

• Calray Electric

• The maximum available three-phase and line-to-ground fault currents and associated X/R ratios were obtained from the Short-Circuit, Overcurrent

Device Coordination, & Arc Flash Hazard Analyses performed by

Schneider Electric Engineering Services, LLC March 22, 2016 (Job

Number Q2C: 37151901)

2.3.2 Assumptions

The following assumptions were used in modeling the power system, and ensure conservative, worst-case results:

• All motors were assumed to be running.

• Motor subtransient reactance is assumed to be 17%.

• Motors rated less than 50 hp were modeled as lumped groups.

• System voltage is modeled at 100% nominal.

See Section 7 for detailed input information.

2.3.3 Short-Circuit Analysis Results

See Section 7 for short-circuit analysis results.

Table 2 – Equipment Evaluation Bus Manufacturer Status Type Voltage Calculated short-circuit kA

Device interrupting rating kA

Short-circuit rating %

AHU-1 (EP1)

VFD

Carrier Pass VFD 480.0 4.33 5.0 86.60

AHU-1 (EP2)

VFD

Carrier Pass VFD 480.0 2.16 5.0 43.20

ATS-C BUS Eaton Pass ATS 480.0 12.33 30.0 41.10

ATS-L BUS Eaton Pass ATS 480.0 12.12 30.0 40.40

CB-C Eaton Pass Enclosed Circuit

Breaker

480.0 5.11 35.0 14.60

CB-EM-CLC1 Eaton Pass Enclosed Circuit

Breaker

480.0 5.11 35.0 14.60

CB-EM-CLC2 Eaton Pass Enclosed Circuit

Breaker

480.0 5.29 35.0 15.11

CB-L Eaton Pass Enclosed Circuit

Breaker

480.0 5.10 14.0 36.43

CH-1 DISC Eaton Pass Safety Switch 480.0 8.20 200.0 4.10

LTG CNTRL

LCP1

nLight Pass Industrial Control

Panel

277.0 10.60 18.0 58.89

MSB-CLC2 Eaton Pass Switchboard 480.0 12.93 35.0 36.94

PANEL CH1 Eaton Pass Panelboard 480.0 11.50 35.0 32.86

PANEL CL1 Eaton Pass Panelboard 208.0 4.69 10.0 46.90

PANEL CL2 Eaton Pass Panelboard 208.0 4.57 10.0 45.70

PANEL LH1 Eaton Pass Panelboard 480.0 11.36 35.0 32.46

PANEL LL1 Eaton Pass Panelboard 208.0 1.10 10.0 11.00

PANEL NH1 Eaton Pass Panelboard 480.0 12.18 35.0 34.80

PANEL NL1 Eaton Pass Panelboard 208.0 5.36 10.0 53.60

PANEL NL2 Eaton Pass Panelboard 208.0 5.28 10.0 52.80

3. PROTECTIVE DEVICE COORDINATION STUDY

3.1 Background and Procedures

The protective device coordination study systematically applies current actuated protective devices (circuit breakers, relays, and fuses) to achieve an optimal compromise between equipment protection and power system selectivity.

The time-current characteristic curves (TCCs) were developed using SKM

CAPTOR software module. The protective device coordination study was performed in accordance with IEEE Standard 242-2001 (Buff Book), IEEE

Recommended Practice for Protection and Coordination of Industrial and

Commercial Power Systems.

Using the appropriate maximum fault currents, the TCCs were plotted as operating time versus current magnitudes on a log-log scale to show protective device operating characteristics and coordination among these devices.

Consideration was given to provide both selective isolation of faults and maximum protection of equipment such as switchboards, panelboards, cables, transformers, and motors.

To achieve optimum protection and selectivity, protective device settings should be high enough to allow the continuous full-load operation of cables and the equipment they supply, and to tolerate temporary power system disturbances such as transformer and motor in-rush currents. However, the settings should be low enough to provide overload and short-circuit protection under minimum fault conditions.

3.1.1 Coordination Objectives

Develop time-current coordination curves to derive coordinated settings for adjustable protective devices at the VA Loma Linda

Community Living Center 2.

3.1.2 Coordination Results

Analysis on the normal power branch begins at the 600A main distribution switchboard (“MSB-CLC2”) served from a 600A breaker in existing switchboard MDBU. Analysis on the emergency branch begins at the 250A enclosed circuit breaker (“CB-EM-CLC2”) served from a 250A breaker in existing switchboard SBCM.

As shown on the TCCs, each device curve is tagged with an arrow and label referencing its location on the plot's individual representative one-line diagram. This label also references the device to its’ specific manufacturer information, including ratings and settings, as indicated in the text box on each plot. The device time-current characteristics are truncated at maximum through-fault current for a downstream fault.

Efforts were made to provide the best coordination possible with the new protective devices. Areas where breaker trip curves overlap indicate areas of possible non-selective breaker operation. Where possible, efforts were made to reduce non-selective breaker operation while maintaining adequate system protection. In some cases, because of device limitations, little can be done to improve device selectivity.

Such device limitations include the fixed operating characteristic of a fuse, the built-in instantaneous or instantaneous “over-ride” elements of molded case circuit breakers, and the limited instantaneous trip range of trip units with an instantaneous trip function.

In cases involving redundant/series protective devices, non-selective breaker operation is of little or no concern. Protective devices are redundant if, regardless of which device opens, the same system outage occurs. Often, to improve overall system protection and coordination, redundant devices are intentionally set to overlap one another.

3.1.3 Coordination Recommendations

All new adjustable protective devices at the VA Loma Linda

Community Living Center 2 should be set per Table 3.

3.1.4 Time-Current Characteristic Plots

Refer to the following pages for the plotted coordination curves, which graphically demonstrate the degree of selectivity and protection obtained.

In some cases, a single TCC may be applicable to several locations in the system, where each location utilizes substantially similar devices, and serves similar loads.

0.5 1 10 1

K

K

0.010.01

0.100.10

100100

10001000

CURRENT IN AMPERES

T

IM

E

IN

S

E C

O N

D S T

IM

E

I N

S E

C O

N D

S

MSB-CLC2 MAIN

CUTLER-HAMMER

LG Frame, 310+

LGE

Trip 600.0 A Settings Phase Ir for In = 600A H (600A) LTD (2-24 Sec.) 10 STPU (2-12 x Ir) 7 (4200A) STD (Flat) 120ms (M,N,O)

INST 12 (7200A)

XFMR T-NL1 FDR

CUTLER-HAMMER

FDE/FDCE/HFDE, 310+

FDE

Trip 225.0 A Plug 175.0 A Settings Phase Ir, 225A Sensor F (175) (175A) LTD (2 - 24s) 24 STPU (2 - 12 x Ir) 12 (2100A) STD FLAT (Inst-300ms) Inst (J,K,L) INST OR Fixed (2700A)

MSB-CLC2 FDR

CUTLER-HAMMER

SPB, RMS 510/610/810/910

SPB-100

Trip 800.0 A Plug 600.0 A Settings Phase LTPU (0.5-1.0 x P) 1 (600A) LTD (2-24 Sec.) 12 STPU (2-8 x LTPU) S2(8) (4800A) STD (0.1-0.5 Sec.) 0.2 (I^2t Off) INST (2-10 x P) M2(10) (6000A) OVERRIDE (1 x ST) Fixed (25000A)

MSB-CLC2 MAIN

CUTLER-HAMMER

LG Frame, 310+

LGE

Trip 600.0 A Settings Phase Ir for In = 600A H (600A) LTD (2-24 Sec.) 10 STPU (2-12 x Ir) 7 (4200A) STD (Flat) 120ms (M,N,O)

INST 12 (7200A)

XFMR T-NL1 FDR

CUTLER-HAMMER

FDE/FDCE/HFDE, 310+

FDE

Trip 225.0 A Plug 175.0 A Settings Phase Ir, 225A Sensor F (175) (175A) LTD (2 - 24s) 24 STPU (2 - 12 x Ir) 12 (2100A) STD FLAT (Inst-300ms) Inst (J,K,L) INST OR Fixed (2700A)

MSB-CLC2 FDR

CUTLER-HAMMER

SPB, RMS 510/610/810/910

SPB-100

Trip 800.0 A Plug 600.0 A Settings Phase LTPU (0.5-1.0 x P) 1 (600A) LTD (2-24 Sec.) 12 STPU (2-8 x LTPU) S2(8) (4800A) STD (0.1-0.5 Sec.) 0.2 (I^2t Off) INST (2-10 x P) M2(10) (6000A) OVERRIDE (1 x ST) Fixed (25000A)

600AT

MSB-CLC2 FDR

CBL-0003

MSB-CLC2 MAIN

XFMR T-NL1 FDR

MSB-CLC2

MDBU

MSB-CLC2 Current Scale x 100 Reference Voltage: 480 August 15, 2017 12:52 PM SKM Systems Analysis, Inc.

K

K

0.010.01

0.100.10

100100

10001000

CURRENT IN AMPERES

T

IM

E

IN

S

E C

O N

D S T

IM

E

I N

S E

C O

N D

S

MSB-CLC2 MAIN

CUTLER-HAMMER

LG Frame, 310+

LGE

Trip 600.0 A Settings Phase Ir for In = 600A H (600A) LTD (2-24 Sec.) 10 STPU (2-12 x Ir) 7 (4200A) STD (Flat) 120ms (M,N,O)

INST 12 (7200A)

PANEL NH1 FDR

CUTLER-HAMMER

FDE/FDCE/HFDE, 310+

FDE

Trip 160.0 A Plug 100.0 A Settings Phase Ir, 160A Sensor E (100) (100A) LTD (2 - 24s) 2 STPU (2 - 12 x Ir) 12 (1200A) STD FLAT (Inst-300ms) Inst (J,K,L) INST OR Fixed (1920A)

NH1 TYP FDR

CUTLER-HAMMER

FD, 1-Pole

FD

Trip 20.0 A Settings Phase Fixed

MSB-CLC2 MAIN

CUTLER-HAMMER

LG Frame, 310+

LGE

Trip 600.0 A Settings Phase Ir for In = 600A H (600A) LTD (2-24 Sec.) 10 STPU (2-12 x Ir) 7 (4200A) STD (Flat) 120ms (M,N,O)

INST 12 (7200A)

PANEL NH1 FDR

CUTLER-HAMMER

FDE/FDCE/HFDE, 310+

FDE

Trip 160.0 A Plug 100.0 A Settings Phase Ir, 160A Sensor E (100) (100A) LTD (2 - 24s) 2 STPU (2 - 12 x Ir) 12 (1200A) STD FLAT (Inst-300ms) Inst (J,K,L) INST OR Fixed (1920A)

NH1 TYP FDR

CUTLER-HAMMER

FD, 1-Pole

FD

Trip 20.0 A Settings Phase Fixed

MSB-CLC2 MAIN

PANEL NH1 FDR

CBL-0004

PANEL NH1

NH1 TYP FDR

MSB-CLC2

PANEL NH1 Current Scale x 10 Reference Voltage: 480 August 15, 2017 12:56 PM SKM Systems Analysis, Inc.

TX Inrush

XFMR T-NL1

0.5 1 10 1

K

K

0.010.01

0.100.10

100100

10001000

CURRENT IN AMPERES

T

IM

E

IN

S

E C

O N

D S T

IM

E

I N

S E

C O

N D

S

MSB-CLC2 MAIN

CUTLER-HAMMER

LG Frame, 310+

LGE

Trip 600.0 A Settings Phase Ir for In = 600A H (600A) LTD (2-24 Sec.) 10 STPU (2-12 x Ir) 7 (4200A) STD (Flat) 120ms (M,N,O)

INST 12 (7200A)

XFMR T-NL1 FDR

CUTLER-HAMMER

FDE/FDCE/HFDE, 310+

FDE

Trip 225.0 A Plug 175.0 A Settings Phase Ir, 225A Sensor F (175) (175A) LTD (2 - 24s) 24 STPU (2 - 12 x Ir) 12 (2100A) STD FLAT (Inst-300ms) Inst (J,K,L) INST OR Fixed (2700A)

PANEL NL1 MAIN

CUTLER-HAMMER

DK

DK

Trip 400.0 A Settings Phase Thermal Curve (Fixed) INST (5-10 x Trip) 10 (4000A)

PANEL NL2 FDR

CUTLER-HAMMER

EDB, 2-3 Poles

EDB

Trip 225.0 A Settings Phase Fixed

XFMR T-NL1

MSB-CLC2 MAIN

CUTLER-HAMMER

LG Frame, 310+

LGE

Trip 600.0 A Settings Phase Ir for In = 600A H (600A) LTD (2-24 Sec.) 10 STPU (2-12 x Ir) 7 (4200A) STD (Flat) 120ms (M,N,O)

INST 12 (7200A)

XFMR T-NL1 FDR

CUTLER-HAMMER

FDE/FDCE/HFDE, 310+

FDE

Trip 225.0 A Plug 175.0 A Settings Phase Ir, 225A Sensor F (175) (175A) LTD (2 - 24s) 24 STPU (2 - 12 x Ir) 12 (2100A) STD FLAT (Inst-300ms) Inst (J,K,L) INST OR Fixed (2700A)

PANEL NL1 MAIN

CUTLER-HAMMER

DK

DK

Trip 400.0 A Settings Phase Thermal Curve (Fixed) INST (5-10 x Trip) 10 (4000A)

PANEL NL2 FDR

CUTLER-HAMMER

EDB, 2-3 Poles

EDB

Trip 225.0 A Settings Phase Fixed

XFMR T-NL1

MSB-CLC2 MAIN

XFMR T-NL1 FDR

CBL-0005

S

P

XFMR T-NL1

CBL-0012

PANEL NL1

PANEL NL1 MAIN

PANEL NL2 FDR

MSB-CLC2

PANEL NL1 Current Scale x 10 Reference Voltage: 480 August 15, 2017 12:57 PM SKM Systems Analysis, Inc.

K

K

0.010.01

0.100.10

100100

10001000

CURRENT IN AMPERES

T

IM

E

IN

S

E C

O N

D S T

IM

E

I N

S E

C O

N D

S

MSB-CLC2 MAIN

CUTLER-HAMMER

LG Frame, 310+

LGE

Trip 600.0 A Settings Phase Ir for In = 600A H (600A) LTD (2-24 Sec.) 10 STPU (2-12 x Ir) 7 (4200A) STD (Flat) 120ms (M,N,O)

INST 12 (7200A)

CHILLER CH-1 FDR

CUTLER-HAMMER

FDE/FDCE/HFDE, 310+

FDE

Trip 225.0 A Plug 110.0 A Settings Phase Ir, 225A Sensor B (110) (110A) LTD (2 - 24s) 7 STPU (2 - 12 x Ir) 10 (1100A) STD FLAT (Inst-300ms) Inst (J,K,L) INST OR Fixed (2700A)

CH-1

MSB-CLC2 MAIN

CUTLER-HAMMER

LG Frame, 310+

LGE

Trip 600.0 A Settings Phase Ir for In = 600A H (600A) LTD (2-24 Sec.) 10 STPU (2-12 x Ir) 7 (4200A) STD (Flat) 120ms (M,N,O)

INST 12 (7200A)

CHILLER CH-1 FDR

CUTLER-HAMMER

FDE/FDCE/HFDE, 310+

FDE

Trip 225.0 A Plug 110.0 A Settings Phase Ir, 225A Sensor B (110) (110A) LTD (2 - 24s) 7 STPU (2 - 12 x Ir) 10 (1100A) STD FLAT (Inst-300ms) Inst (J,K,L) INST OR Fixed (2700A)

CH-1

MSB-CLC2 MAIN

CHILLER CH-1 FDR

CBL-0006

CH-1 DISC

CH-1

MSB-CLC2

CH-1 Current Scale x 10 Reference Voltage: 480 August 15, 2017 12:51 PM SKM Systems Analysis, Inc.

K

K

0.010.01

0.100.10

100100

10001000

CURRENT IN AMPERES

T

IM

E

IN

S

E C

O N

D S T

IM

E

I N

S E

C O

N D

S

MSB-CLC2 MAIN

CUTLER-HAMMER

LG Frame, 310+

LGE

Trip 600.0 A Settings Phase Ir for In = 600A H (600A) LTD (2-24 Sec.) 10 STPU (2-12 x Ir) 7 (4200A) STD (Flat) 120ms (M,N,O)

INST 12 (7200A)

AHU-1 (EP1) FDR

CUTLER-HAMMER

FDE/FDCE/HFDE, 310+

FDE

Trip 160.0 A Plug 60.0 A Settings Phase Ir, 160A Sensor A (60) (60A) LTD (2 - 24s) 4 STPU (2 - 12 x Ir) 8 (480A) STD FLAT (Inst-300ms) Inst (J,K,L) INST OR Fixed (1920A)

AHU-1 (EP1)

MSB-CLC2 MAIN

CUTLER-HAMMER

LG Frame, 310+

LGE

Trip 600.0 A Settings Phase Ir for In = 600A H (600A) LTD (2-24 Sec.) 10 STPU (2-12 x Ir) 7 (4200A) STD (Flat) 120ms (M,N,O)

INST 12 (7200A)

AHU-1 (EP1) FDR

CUTLER-HAMMER

FDE/FDCE/HFDE, 310+

FDE

Trip 160.0 A Plug 60.0 A Settings Phase Ir, 160A Sensor A (60) (60A) LTD (2 - 24s) 4 STPU (2 - 12 x Ir) 8 (480A) STD FLAT (Inst-300ms) Inst (J,K,L) INST OR Fixed (1920A)

AHU-1 (EP1)

MSB-CLC2 MAIN

AHU-1 (EP1) FDR

CBL-0007

AHU-1 (EP1) VFD

AHU-1 (EP1)

MSB-CLC2

AHU-1 (EP1) Current Scale x 10 Reference Voltage: 480 August 15, 2017 12:49 PM SKM Systems Analysis, Inc.

K

K

0.010.01

0.100.10

100100

10001000

CURRENT IN AMPERES

T

IM

E

IN

S

E C

O N

D S T

IM

E

I N

S E

C O

N D

S

MSB-CLC2 MAIN

CUTLER-HAMMER

LG Frame, 310+

LGE

Trip 600.0 A Settings Phase Ir for In = 600A H (600A) LTD (2-24 Sec.) 10 STPU (2-12 x Ir) 7 (4200A) STD (Flat) 120ms (M,N,O)

INST 12 (7200A)

AHU-1 (EP2) FDR

CUTLER-HAMMER

FDE/FDCE/HFDE, 310+

FDE

Trip 80.0 A Plug 20.0 A Settings Phase Ir, 80A Sensor B (20) (20A) LTD (2 - 24s) 12 STPU (2 - 12 x Ir) 12 (240A) STD FLAT (Inst-300ms) Inst (J,K,L) INST OR Fixed (960A)

AHU-1 (EP2)

MSB-CLC2 MAIN

CUTLER-HAMMER

LG Frame, 310+

LGE

Trip 600.0 A Settings Phase Ir for In = 600A H (600A) LTD (2-24 Sec.) 10 STPU (2-12 x Ir) 7 (4200A) STD (Flat) 120ms (M,N,O)

INST 12 (7200A)

AHU-1 (EP2) FDR

CUTLER-HAMMER

FDE/FDCE/HFDE, 310+

FDE

Trip 80.0 A Plug 20.0 A Settings Phase Ir, 80A Sensor B (20) (20A) LTD (2 - 24s) 12 STPU (2 - 12 x Ir) 12 (240A) STD FLAT (Inst-300ms) Inst (J,K,L) INST OR Fixed (960A)

AHU-1 (EP2)

MSB-CLC2 MAIN

AHU-1 (EP2) FDR

AHU-1 (EP2) VFD

AHU-1 (EP2)

MSB-CLC2

CBL-0008

AHU-1 (EP2) Current Scale x 10 Reference Voltage: 480 August 15, 2017 12:50 PM SKM Systems Analysis, Inc.

K

K

0.010.01

0.100.10

100100

10001000

CURRENT IN AMPERES

T

IM

E

IN

S

E C

O N

D S T

IM

E

I N

S E

C O

N D

S

PANEL LH1 MAIN

CUTLER-HAMMER

FDE/FDCE/HFDE, 310+

FDE

Trip 160.0 A Plug 160.0 A Settings Phase Ir, 160A Sensor E (100) (100A) LTD (2 - 24s) 7 STPU (2 - 12 x Ir) 12 (1200A) STD FLAT (Inst-300ms) 300ms (P,Q,R) INST OR Fixed (1920A)

XFMR T-LL1 FDR

CUTLER-HAMMER

FD

FD

Trip 50.0 A Settings Phase Fixed

MSB-CLC2 MAIN

CUTLER-HAMMER

LG Frame, 310+

LGE

Trip 600.0 A Settings Phase Ir for In = 600A H (600A) LTD (2-24 Sec.) 10 STPU (2-12 x Ir) 7 (4200A) STD (Flat) 120ms (M,N,O)

INST 12 (7200A)

ATS-L FDR

CUTLER-HAMMER

FDE/FDCE/HFDE, 310+

FDE

Trip 160.0 A Plug 160.0 A Settings Phase Ir, 160A Sensor E (100) (100A) LTD (2 - 24s) 7 STPU (2 - 12 x Ir) 12 (1200A) STD FLAT (Inst-300ms) 300ms (P,Q,R) INST OR Fixed (1920A)

PANEL LH1 MAIN

CUTLER-HAMMER

FDE/FDCE/HFDE, 310+

FDE

Trip 160.0 A Plug 160.0 A Settings Phase Ir, 160A Sensor E (100) (100A) LTD (2 - 24s) 7 STPU (2 - 12 x Ir) 12 (1200A) STD FLAT (Inst-300ms) 300ms (P,Q,R) INST OR Fixed (1920A)

XFMR T-LL1 FDR

CUTLER-HAMMER

FD

FD

Trip 50.0 A Settings Phase Fixed

MSB-CLC2 MAIN

CUTLER-HAMMER

LG Frame, 310+

LGE

Trip 600.0 A Settings Phase Ir for In = 600A H (600A) LTD (2-24 Sec.) 10 STPU (2-12 x Ir) 7 (4200A) STD (Flat) 120ms (M,N,O)

INST 12 (7200A)

ATS-L FDR

CUTLER-HAMMER

FDE/FDCE/HFDE, 310+

FDE

Trip 160.0 A Plug 160.0 A Settings Phase Ir, 160A Sensor E (100) (100A) LTD (2 - 24s) 7 STPU (2 - 12 x Ir) 12 (1200A) STD FLAT (Inst-300ms) 300ms (P,Q,R) INST OR Fixed (1920A)

PANEL LH1

PANEL LH1 MAIN

XFMR T-LL1 FDR

MSB-CLC2 MAIN

ATS-L FDR

CBL-0009

EN

ATS-L

ATS-L BUS

CBL-0014

MSB-CLC2

PANEL LH1 Current Scale x 10 Reference Voltage: 480 August 15, 2017 12:55 PM SKM Systems Analysis, Inc.

K

K

0.010.01

0.100.10

100100

10001000

CURRENT IN AMPERES

T

IM

E

IN

S

E C

O N

D S T

IM

E

I N

S E

C O

N D

S

PANEL LL1 MAIN

CUTLER-HAMMER

BAB, 3-Pole

BAB

Trip 50.0 A Settings Phase Fixed

PANEL LL1 LGST

CUTLER-HAMMER

BAB, 1-Pole

BAB

Trip 20.0 A Settings Phase Fixed

PANEL LL1 MAIN

CUTLER-HAMMER

BAB, 3-Pole

BAB

Trip 50.0 A Settings Phase Fixed

PANEL LL1 LGST

CUTLER-HAMMER

BAB, 1-Pole

BAB

Trip 20.0 A Settings Phase Fixed

PANEL LL1

PANEL LL1 MAIN

PANEL LL1 LGST

PANEL LL1 Current Scale x 1 Reference Voltage: 208 August 15, 2017 12:55 PM SKM Systems Analysis, Inc.

K

K

0.010.01

0.100.10

100100

10001000

CURRENT IN AMPERES

T

IM

E

IN

S

E C

O N

D S T

IM

E

I N

S E

C O

N D

S

PANEL CH1 MAIN

CUTLER-HAMMER

FDE/FDCE/HFDE, 310+

FDE

Trip 225.0 A Plug 225.0 A Settings Phase Ir, 225A Sensor D (150) (150A) LTD (2 - 24s) 24 STPU (2 - 12 x Ir) 12 (1800A) STD FLAT (Inst-300ms) Inst (J,K,L) INST OR Fixed (2700A)

XFMR T-CL1 FDR

CUTLER-HAMMER

FD

FD

Trip 110.0 A Settings Phase Fixed

MSB-CLC2 MAIN

CUTLER-HAMMER

LG Frame, 310+

LGE

Trip 600.0 A Settings Phase Ir for In = 600A H (600A) LTD (2-24 Sec.) 10 STPU (2-12 x Ir) 7 (4200A) STD (Flat) 120ms (M,N,O)

INST 12 (7200A)

ATS-C FDR

CUTLER-HAMMER

FDE/FDCE/HFDE, 310+

FDE

Trip 225.0 A Plug 150.0 A Settings Phase Ir, 225A Sensor D (150) (150A) LTD (2 - 24s) 24 STPU (2 - 12 x Ir) 12 (1800A) STD FLAT (Inst-300ms) Inst (J,K,L) INST OR Fixed (2700A)

PANEL CH1 MAIN

CUTLER-HAMMER

FDE/FDCE/HFDE, 310+

FDE

Trip 225.0 A Plug 225.0 A Settings Phase Ir, 225A Sensor D (150) (150A) LTD (2 - 24s) 24 STPU (2 - 12 x Ir) 12 (1800A) STD FLAT (Inst-300ms) Inst (J,K,L) INST OR Fixed (2700A)

XFMR T-CL1 FDR

CUTLER-HAMMER

FD

FD

Trip 110.0 A Settings Phase Fixed

MSB-CLC2 MAIN

CUTLER-HAMMER

LG Frame, 310+

LGE

Trip 600.0 A Settings Phase Ir for In = 600A H (600A) LTD (2-24 Sec.) 10 STPU (2-12 x Ir) 7 (4200A) STD (Flat) 120ms (M,N,O)

INST 12 (7200A)

ATS-C FDR

CUTLER-HAMMER

FDE/FDCE/HFDE, 310+

FDE

Trip 225.0 A Plug 150.0 A Settings Phase Ir, 225A Sensor D (150) (150A) LTD (2 - 24s) 24 STPU (2 - 12 x Ir) 12 (1800A) STD FLAT (Inst-300ms) Inst (J,K,L) INST OR Fixed (2700A)

PANEL CH1

PANEL CH1 MAIN

XFMR T-CL1 FDR

MSB-CLC2 MAIN

ATS-C FDR

EN

ATS-C

ATS-C BUS

MSB-CLC2

CBL-0010

CBL-0016

PANEL CH1 Current Scale x 10 Reference Voltage: 480 August 15, 2017 12:53 PM SKM Systems Analysis, Inc.

TX Inrush

XFMR T-CL1

0.5 1 10 1

K

K

0.010.01

0.100.10

100100

10001000

CURRENT IN AMPERES

T

IM

E

IN

S

E C

O N

D S T

IM

E

I N

S E

C O

N D

S

PANEL CL1 MAIN

CUTLER-HAMMER

EDB, 2-3 Poles

EDB

Trip 225.0 A Settings Phase Fixed

PANEL CL2 FDR

CUTLER-HAMMER

BAB, 3-Pole

BAB

Trip 100.0 A Settings Phase Fixed

PANEL CH1 MAIN

CUTLER-HAMMER

FDE/FDCE/HFDE, 310+

FDE

Trip 225.0 A Plug 225.0 A Settings Phase Ir, 225A Sensor D (150) (150A) LTD (2 - 24s) 24 STPU (2 - 12 x Ir) 12 (1800A) STD FLAT (Inst-300ms) Inst (J,K,L) INST OR Fixed (2700A)

XFMR T-CL1 FDR

CUTLER-HAMMER

FD

FD

Trip 110.0 A Settings Phase Fixed

PANEL CL1 MAIN

CUTLER-HAMMER

EDB, 2-3 Poles

EDB

Trip 225.0 A Settings Phase Fixed

PANEL CL2 FDR

CUTLER-HAMMER

BAB, 3-Pole

BAB

Trip 100.0 A Settings Phase Fixed

PANEL CH1 MAIN

CUTLER-HAMMER

FDE/FDCE/HFDE, 310+

FDE

Trip 225.0 A Plug 225.0 A Settings Phase Ir, 225A Sensor D (150) (150A) LTD (2 - 24s) 24 STPU (2 - 12 x Ir) 12 (1800A) STD FLAT (Inst-300ms) Inst (J,K,L) INST OR Fixed (2700A)

XFMR T-CL1 FDR

CUTLER-HAMMER

FD

FD

Trip 110.0 A Settings Phase Fixed

PANEL CL1

PANEL CL1 MAIN

PANEL CL2 FDR

PANEL CH1

PANEL CH1 MAIN

XFMR T-CL1 FDR

CBL-0017

S

P

XFMR T-CL1

CBL-0020

PANEL CL1 Current Scale x 10 Reference Voltage: 208 August 15, 2017 12:54 PM SKM Systems Analysis, Inc.

K

K

0.010.01

0.100.10

100100

10001000

CURRENT IN AMPERES

T

IM

E

IN

S

E C

O N

D S T

IM

E

I N

S E

C O

N D

S

CB-EM-CLC2 FDR

SQUARE D

J-Frame, Powerpact

JJ

Trip 250.0 A Settings Phase Thermal Curve INST (5-10 x Trip) High (2500A)

CB-EM-CLC2 BKR

CUTLER-HAMMER

KD

KD

Trip 250.0 A Settings Phase Thermal Curve (Fixed) INST (5-10 x Trip) 10 (2500A)

CB-L BKR

CUTLER-HAMMER

EHD

EHD

Trip 100.0 A Settings Phase Fixed

CB-EM-CLC2 FDR

SQUARE D

J-Frame, Powerpact

JJ

Trip 250.0 A Settings Phase Thermal Curve INST (5-10 x Trip) High (2500A)

CB-EM-CLC2 BKR

CUTLER-HAMMER

KD

KD

Trip 250.0 A Settings Phase Thermal Curve (Fixed) INST (5-10 x Trip) 10 (2500A)

CB-L BKR

CUTLER-HAMMER

EHD

EHD

Trip 100.0 A Settings Phase Fixed

SBCM

CB-EM-CLC2 FDR

CBL-0015

CB-EM-CLC2

CB-EM-CLC2 BKR

CBL-0022

GUTTER TROUGH

CBL-0025

CB-L

CB-L BKR

CB-L Current Scale x 10 Reference Voltage: 480 August 7, 2017 3:42 PM SKM Systems Analysis, Inc.

K

K

0.010.01

0.100.10

100100

10001000

CURRENT IN AMPERES

T

IM

E

IN

S

E C

O N

D S T

IM

E

I N

S E

C O

N D

S

CB-EM-CLC2 FDR

SQUARE D

J-Frame, Powerpact

JJ

Trip 250.0 A Settings Phase Thermal Curve INST (5-10 x Trip) High (2500A)

CB-EM-CLC2 BKR

CUTLER-HAMMER

KD

KD

Trip 250.0 A Settings Phase Thermal Curve (Fixed) INST (5-10 x Trip) 10 (2500A)

CB-C BKR

CUTLER-HAMMER

FD

FD

Trip 150.0 A Settings Phase Fixed

CB-EM-CLC2 FDR

SQUARE D

J-Frame, Powerpact

JJ

Trip 250.0 A Settings Phase Thermal Curve INST (5-10 x Trip) High (2500A)

CB-EM-CLC2 BKR

CUTLER-HAMMER

KD

KD

Trip 250.0 A Settings Phase Thermal Curve (Fixed) INST (5-10 x Trip) 10 (2500A)

CB-C BKR

CUTLER-HAMMER

FD

FD

Trip 150.0 A Settings Phase Fixed

SBCM

CB-EM-CLC2 FDR

CBL-0015

CB-EM-CLC2

CB-EM-CLC2 BKR

CBL-0022

GUTTER TROUGH

CBL-0024

CB-C

CB-C BKR

CB-C Current Scale x 10 Reference Voltage: 480 August 7, 2017 3:40 PM SKM Systems Analysis, Inc.

K

K

0.010.01

0.100.10

100100

10001000

CURRENT IN AMPERES

T

IM

E

IN

S

E C

O N

D S T

IM

E

I N

S E

C O

N D

S

MSB-CLC2 FDR

CUTLER-HAMMER

SPB, RMS 510/610/810/910

SPB-100

Trip 800.0 A Plug 600.0 A Settings Ground GFPU (100-1200A Plug) K (600A) GFD (0.1-0.5 Sec.) 0.5 Sec. (I^2t Off)

MSB-CLC2 MAIN

CUTLER-HAMMER

LG, Series G

LGE

Trip 600.0 A Plug 600.0 A Settings Ground GFPU, (0.2 - 1 x In) 1X (600A) GFD, (Inst-300ms) 300ms (L,O,R)

NH1 TYP FDR

CUTLER-HAMMER

FD, 1-Pole

FD

Trip 20.0 A Settings Phase Fixed

PANEL NH1 FDR

CUTLER-HAMMER

FDE/FDCE/HFDE, 310+

FDE

Trip 160.0 A Plug 100.0 A Settings Ground GFPU, (0.2 - 1 x S) 1 (160A) GFD, (Inst - 300ms) 120ms (K,N,Q)

MSB-CLC2 FDR

CUTLER-HAMMER

SPB, RMS 510/610/810/910

SPB-100

Trip 800.0 A Plug 600.0 A Settings Ground GFPU (100-1200A Plug) K (600A) GFD (0.1-0.5 Sec.) 0.5 Sec. (I^2t Off)

MSB-CLC2 MAIN

CUTLER-HAMMER

LG, Series G

LGE

Trip 600.0 A Plug 600.0 A Settings Ground GFPU, (0.2 - 1 x In) 1X (600A) GFD, (Inst-300ms) 300ms (L,O,R)

NH1 TYP FDR

CUTLER-HAMMER

FD, 1-Pole

FD

Trip 20.0 A Settings Phase Fixed

PANEL NH1 FDR

CUTLER-HAMMER

FDE/FDCE/HFDE, 310+

FDE

Trip 160.0 A Plug 100.0 A Settings Ground GFPU, (0.2 - 1 x S) 1 (160A) GFD, (Inst - 300ms) 120ms (K,N,Q)

MDBU

MSB-CLC2 FDR

CBL-0003

MSB-CLC2 MAIN

MSB-CLC2

PANEL NH1 FDR

CBL-0004

PANEL NH1

NH1 TYP FDR

GROUND FAULT Current Scale x 10 Reference Voltage: 480 August 15, 2017 1:56 PM SKM Systems Analysis, Inc.

Table 3: Adjustable Breaker Settings Table Bus Device Name Manufacturer/Style Frame/Plug

(Amps)

Trip Unit LTPU LTD STPU STD INST GFPU GFD

MDBU MSB-CLC2 FDR Eaton/SPB-100 800/600 Digitrip

910 LSIG

(600A)

12s S2

(4800A)

0.2s M2

(6000A) K

(600A)

0.5s

SBCM CB-EM-CLC2 FDR Square D/JJ 250/250 T/M - - - - 10

(2500A)

MSB-CLC2 MSB-CLC2 MAIN Eaton/LGE 600/600 Digitrip

310+ LSIG

H

(600A)

10s 7

(4200A)

120ms 12

(7200A) 1 (600A) 300ms

MSB-CLC2 PANEL NH1 FDR Eaton/FDE 225/160 Digitrip

310+ LSIG

E

(100A)

2s 12

(1200A)

Inst - 1 (160A) 120ms

MSB-CLC2 XFMR T-NL1 FDR Eaton/FDE 225/225 Digitrip

310+ LSIG

F

(175A)

24s 12

(2100A)

Inst - 1 (225A) 120ms

MSB-CLC2 CHILLER CH-1 FDR Eaton/FDE 225/225 Digitrip

310+ LSIG

B

(110A)

7s 10

(1100A)

Inst - 1 (225A) 120ms

MSB-CLC2 AHU-1 (EP1) FDR Eaton/FDE 225/160 Digitrip

310+ LSIG

A

(60A)

4s 8

(480A)

Inst - 1 (160A) 120ms

MSB-CLC2 AHU-1 (EP2) FDR Eaton/FDE 225/80 Digitrip

310+ LSIG

B

(20A)

12s 12

(240A)

Inst - 1 (80A) 120ms

MSB-CLC2 ATS-L FDR Eaton/FDE 225/160 Digitrip

310+ LSIG

E

(100A)

7s 12

(1200A)

300ms - 1 (160A) 120ms

MSB-CLC2 ATS-C FDR Eaton/FDE 225/225 Digitrip

310+ LSIG

D

(150A)

24s 12

(1800A)

Inst - 1 (225A) 120ms

PANEL NL1 PANEL NL1 MAIN Eaton/DK 400/400 T/M - - - - 10

(4000A)

PANEL LH1 PANEL LH1 MAIN Eaton/FDE 225/160 Digitrip

310+ LSI

E

(100A)

7s 12

(1200A)

300ms - - -

PANEL CH1 PANEL CH1 MAIN Eaton/FDE 225/225 Digitrip

310+ LSI

D

(150A)

24s 12

(1800A)

Inst - - -

CB-EM-CLC2 CB-EM-CLC2 BKR Eaton/KD 400/250 T/M - - - - 10

(2500A)

4 ARC FLASH RISK ASSESSMENT

4.1 Background and Analysis

The 2015 edition of NFPA 70E requires that an arc flash risk assessment be performed to determine if an arc flash hazard exists, the arc flash boundary, and the PPE to be used within the arc flash boundary. NFPA 70E also requires that the risk assessment be updated when a major renovation or modification to the electrical system occurs. Any modification to the power system that could cause a change in the available short circuit current or operating time of overcurrent protective devices (OCPDs) requires an update. In addition, NFPA

70E requires a periodic review (no more than five years) to determine if any changes have occurred that could change the assessment.

The severity of an arc flash event is dependent upon the operating time of the

OCPD which isolates the fault and the magnitude of the arcing fault current.

SKM calculates the arcing fault currents at protective devices using equations defined in IEEE Standard 1584-2002, IEEE Guide for Performing Arc Flash

Hazard Calculations. Arc flash incident energies in cal/cm2 at working distances defined in IEEE Standard 1584 are then determined. Appropriate arc rated (AR) PPE can then be selected. The purpose of arc rated PPE is to protect personnel working on energized equipment from the onset of a second-degree or just curable burn. An incident energy level of 1.2 cal/cm2 is considered the energy threshold for a second-degree burn. IEEE 1584 is applicable only to three-phase arcing faults (although single-phase or phase-phase arcing faults are generally expected to escalate to three-phase faults), and does not consider the effects of arc blast or other by-products of an arcing fault such as dangerous sound levels, molten metal droplets, and toxic vapors.

Arcing durations are capped at 2 seconds per IEEE 1584 Annex B.1.2.

Situations where a 2 second cutoff may not be appropriate include workers in a lift bucket inspecting or operating overcurrent devices in elevated plug-in busduct, or in other locations where escape from the arc flash boundary during an arc flash event is not possible. An internal VA Loma Linda contingency plan should be developed to address these situations.

NFPA 70B and 70E address the issue of equipment maintenance and its potential effect on the arc flash boundary and selection of PPE. The results of this study assume that existing protective devices have been properly installed and maintained, and will operate within their specified tolerances to clear faults from the system. Non-functioning OCPDs can allow arcing faults to persist for longer than normal, resulting in elevated incident energy values.

It is important to note that the calculated arc flash incident energy levels and arc flash boundaries do not pertain to the shock hazard that exists near all energized electrical equipment. NFPA 70E 130.4(A) requires a shock risk assessment to determine the voltage to which personnel will be exposed, the boundary requirements, and the PPE necessary to minimize the possibility of electric shock to personnel. NFPA 70E Tables 130.4(D)(a) and 130.4(D)(b) provide approach boundaries for nominal system voltages.

IEEE 1584 states that during testing, arcs on 208V systems were difficult to sustain, and arc flash levels on systems operating below 240V served by transformers smaller than 125kVA are “not a concern”. NFPA 70E-2015 article

130.5 Informational Note No. 5 refers to IEEE 1584 for more information regarding arc-flash hazards for three-phase systems. Based on these guidelines from the industry consensus standards, buses operating at less than 240V served by transformers smaller than 125kVA are assumed to have an incident energy of

1.2 cal/cm2.

4.2 Results and Recommendations

The results of the arc flash hazard analysis are given in Table 4. It is important to note that both large and small available short-circuit current magnitudes could result in higher available arc flash incident energies. If the available short-circuit current increases without a decrease in the opening time of the overcurrent protective device, the arc flash energy will increase. If the available short-circuit current decreases, resulting in a longer opening time for the overcurrent protective device, arc flash energies could also increase. Thus, two arc flash fault current scenarios were considered. The results in Table 4 show the worst-case for each respective equipment location included in the study.

Arc flash scenarios:

1. Utility source (MDBU)

2. Emergency source (SBCM)

The protective devices at the VA Loma Linda Community Living Center 2 were set as low as possible to reduce incident energy levels and still provide adequate coordination as required by NEC article 517.31(G).

Table 4: Arc Flash Risk Assessment Results Bus Name

Protective Device Name

Bus kV

Bolted Fault (kA)

Bus Arcing Fault (kA)

Prot Dev Bolted Fault (kA)

Prot Dev Arcing Fault (kA)

Trip/ Delay Time (sec.)

Breaker Opening Time/Tol

(sec.)

Equip Type

Gap (mm)

Arc Flash

Boundary (in)

Working Distance

(in)

Incident Energy

(cal/cm2)

AHU-1 (EP1) VFD AHU-1 (EP1)

FDR

0.48 4.33 3.21 4.25 3.15 0.05 0.0000 PNL 25 10 18 0.49

AHU-1 (EP2) VFD AHU-1 (EP2)

FDR

0.48 2.16 1.77 2.13 1.75 0.05 0.0000 PNL 25 7 18 0.26

ATS-C BUS ATS-C FDR 0.48 12.33 6.67 12.33 6.67 0.0473 0.0000 0.0000 25 16 18 1.0

ATS-L BUS ATS-L FDR 0.48 12.12 7.73 12.12 7.73 0.0252 0.0000 0.0000 25 12 18 0.63

CB-C CB-EM-

CLC2 BKR

0.48 5.11 3.70 5.11 3.70 0.0181 0.0000 PNL 25 6 18 0.20

CB-EM-CLC1 CB-EM-

CLC2 BKR

0.48 5.11 3.70 5.11 3.70 0.0181 0.0000 PNL 25 6 18 0.20

CB-EM-CLC2 CB-EM-

CLC2 FDR

0.48 5.29 3.80 5.29 3.80 0.0161 0.0000 PNL 25 6 18 0.19

CB-L CB-EM-

CLC2 BKR

0.48 5.10 3.13 5.10 3.13 0.0216 0.0000 PNL 25 6 18 0.20

CH-1 DISC CHILLER

CH-1 FDR

0.48 8.20 5.54 7.81 5.27 0.05 0.0000 PNL 25 15 18 0.88

LTG CNTRL LCP1 PANEL NH1

FDR

0.48 10.60 5.86 10.60 5.86 0.0351 0.0000 PNL 25 12 18 0.65

MSB-CLC2 MSB-CLC2

FDR

0.48 12.93 6.94 12.24 6.57 0.24 0.0000 PNL 25 44 18 5.2

PANEL CH1 ATS-C FDR 0.48 11.50 6.28 11.50 6.28 0.05 0.0000 PNL 25 16 18 1.0

PANEL CL1 XFMR T-CL1

FDR

0.208 4.69 2.56 4.69 2.56 1.279 0.0000 PNL 25 18 18 1.2

PANEL CL2 PANEL CL2

FDR

0.208 4.57 2.51 4.57 2.51 0.01 0.0000 PNL 25 3 18 0.07

PANEL LH1 ATS-L FDR 0.48 11.36 6.22 11.36 6.22 0.0323 0.0000 PNL 25 12 18 0.64

Bus Name

Protective Device Name kV

Bolted Fault (kA)

Bus Arcing Fault (kA)

Prot Dev Bolted Fault (kA)

Prot Dev Arcing Fault (kA)

Trip/ Delay Time (sec.)

Breaker Opening Time/Tol

(sec.)

Equip Type

Gap (mm)

Arc Flash

Boundary (in)

Working Distance

(in)

Incident Energy

(cal/cm2)

PANEL LL1 XFMR T-LL1

0.208 1.10 0.92 1.10 0.92 2 0.0000 PNL 25 18 18 1.2

PANEL NH1 PANEL NH1

FDR

0.48 12.18 7.76 12.18 7.76 0.0251 0.0000 PNL 25 12 18 0.63

PANEL NL1 XFMR T-NL1

FDR

0.208 5.36 2.81 5.36 2.81 2 0.0000 PNL 25 18 18 1.2

PANEL NL2 PANEL NL2

0.208 5.28 2.78 5.28 2.78 2 0.0000 PNL 25 18 18 1.2

5 STUDY ONE-LINE DIAGRAM

See one-line diagram E-600 on the attached page.

6 ARC FLASH LABELS

See typical arc flash label on the attached page.

7 SHORT CIRCUIT INPUT/OUTPUT DATA

Aug 08, 2017 10:21:48 Page 1

ALL INFORMATION PRESENTED IS FOR REVIEW, APPROVAL

INTERPRETATION AND APPLICATION BY A REGISTERED ENGINEER ONLY

SKM DISCLAIMS ANY RESPONSIBILITY AND LIABILITY RESULTING

FROM THE USE AND INTERPRETATION OF THIS SOFTWARE.

SKM POWER*TOOLS FOR WINDOWS

INPUT DATA REPORT

COPYRIGHT SKM SYSTEMS ANALYSIS, INC. 1995-2016

ALL PU VALUES ARE EXPRESSED ON A 100 MVA BASE.

Aug 08, 2017 10:21:48 Page 2

FEEDER INPUT DATA

CABLE FEEDER FROM FEEDER TO QTY VOLTS LENGTH FEEDER

NAME NAME NAME /PH L-L SIZE TYPE

CBL-0003 MDBU MSB-CLC2 2 480 430.0 FEET 350 Copper

Duct Material: Magnetic Insulation Type: PVC Insulation Class: THWN

+/- Impedance: 0.0378 + J 0.0491 Ohms/1000 ft 3.53 + J 4.58 PU

Z0 Impedance: 0.1191 + J 0.1209 Ohms/1000 ft 11.11 + J 11.28 PU

CBL-0004 MSB-CLC2 PANEL NH1 1 480 10.0 FEET 2 Copper

Duct Material: Non-Magnetic Insulation Type: PVC Insulation Class: THWN

+/- Impedance: 0.2020 + J 0.0467 Ohms/1000 ft 0.8767 + J 0.2027 PU

Z0 Impedance: 0.3211 + J 0.1188 Ohms/1000 ft 1.39 + J 0.5156 PU

CBL-0005 MSB-CLC2 XFMR T-NL1 PRI 1 480 10.0 FEET 2/0 Copper

Duct Material: Magnetic Insulation Type: PVC Insulation Class: THWN

+/- Impedance: 0.1020 + J 0.0533 Ohms/1000 ft 0.4427 + J 0.2313 PU

Z0 Impedance: 0.3214 + J 0.1312 Ohms/1000 ft 1.39 + J 0.5694 PU

CBL-0006 MSB-CLC2 CH-1 DISC 1 480 100.0 FEET 1 Copper

+/- Impedance: 0.1600 + J 0.0456 Ohms/1000 ft 6.94 + J 1.98 PU

Z0 Impedance: 0.2543 + J 0.1160 Ohms/1000 ft 11.04 + J 5.03 PU

CBL-0007 MSB-CLC2 AHU-1 (EP1) VF 1 480 100.0 FEET 6 Copper

+/- Impedance: 0.5100 + J 0.0548 Ohms/1000 ft 22.14 + J 2.38 PU

Z0 Impedance: 0.8123 + J 0.1394 Ohms/1000 ft 35.26 + J 6.05 PU

CBL-0008 MSB-CLC2 AHU-1 (EP2) VF 1 480 100.0 FEET 10 Copper

+/- Impedance: 1.18 + J 0.0823 Ohms/1000 ft 51.22 + J 3.57 PU

Z0 Impedance: 1.88 + J 0.2093 Ohms/1000 ft 81.42 + J 9.08 PU

CBL-0009 MSB-CLC2 ATS-L (N) 1 480 10.0 FEET 2 Copper

+/- Impedance: 0.2020 + J 0.0585 Ohms/1000 ft 0.8767 + J 0.2539 PU

Z0 Impedance: 0.6366 + J 0.1440 Ohms/1000 ft 2.76 + J 0.6250 PU

CBL-0010 MSB-CLC2 ATS-C (N) 1 480 10.0 FEET 1/0 Copper

+/- Impedance: 0.1280 + J 0.0540 Ohms/1000 ft 0.5556 + J 0.2344 PU

Z0 Impedance: 0.4034 + J 0.1329 Ohms/1000 ft 1.75 + J 0.5768 PU

CBL-0011 PANEL NH1 LTG CNTRL LCP1 1 480 10.0 FEET 6 Copper

+/- Impedance: 0.5100 + J 0.0685 Ohms/1000 ft 2.21 + J 0.2973 PU

Z0 Impedance: 1.61 + J 0.1687 Ohms/1000 ft 6.98 + J 0.7322 PU

Aug 08, 2017 10:21:48 Page 3

CBL-0012 XFMR T-NL1 SEC PANEL NL1 1 208 20.0 FEET 600 Copper

Duct Material: Magnetic Insulation Type: PVC Insulation Class: THWN

+/- Impedance: 0.0257 + J 0.0463 Ohms/1000 ft 1.19 + J 2.14 PU

Z0 Impedance: 0.0809 + J 0.1140 Ohms/1000 ft 3.74 + J 5.27 PU

CBL-0013 PANEL NL1 PANEL NL2 1 208 5.0 FEET 4/0 Copper

+/- Impedance: 0.0640 + J 0.0497 Ohms/1000 ft 0.7396 + J 0.5744 PU

Z0 Impedance: 0.2017 + J 0.1224 Ohms/1000 ft 2.33 + J 1.41 PU

CBL-0014 ATS-L BUS PANEL LH1 1 480 10.0 FEET 2 Copper

CBL-0015 SBCM CB-EM-CLC2 1 480 535.0 FEET 350 Copper

+/- Impedance: 0.0378 + J 0.0491 Ohms/1000 ft 8.78 + J 11.40 PU

Z0 Impedance: 0.1191 + J 0.1209 Ohms/1000 ft 27.66 + J 28.07 PU

CBL-0016 ATS-C BUS PANEL CH1 1 480 15.0 FEET 1/0 Copper

+/- Impedance: 0.1280 + J 0.0540 Ohms/1000 ft 0.8333 + J 0.3516 PU

Z0 Impedance: 0.4034 + J 0.1329 Ohms/1000 ft 2.63 + J 0.8652 PU

CBL-0017 PANEL CH1 XFMR T-CL1 PRI 1 480 10.0 FEET 1/0 Copper

CBL-0018 PANEL LH1 XFMR T-LL1 PRI 1 480 20.0 FEET 10 Copper

+/- Impedance: 1.18 + J 0.0854 Ohms/1000 ft 10.24 + J 0.7413 PU

Z0 Impedance: 3.72 + J 0.2103 Ohms/1000 ft 32.28 + J 1.83 PU

CBL-0019 XFMR T-LL1 SEC PANEL LL1 1 208 5.0 FEET 6 Copper

+/- Impedance: 0.5100 + J 0.0685 Ohms/1000 ft 5.89 + J 0.7917 PU

Z0 Impedance: 1.61 + J 0.1687 Ohms/1000 ft 18.57 + J 1.95 PU

CBL-0020 XFMR T-CL1 SEC PANEL CL1 1 208 20.0 FEET 250 Copper

+/- Impedance: 0.0552 + J 0.0495 Ohms/1000 ft 2.55 + J 2.29 PU

Z0 Impedance: 0.1739 + J 0.1219 Ohms/1000 ft 8.04 + J 5.64 PU

Aug 08, 2017 10:21:48 Page 4

CBL-0021 PANEL CL1 PANEL CL2 1 208 5.0 FEET 2 Copper

Duct Material: Magnetic Insulation Type: PVC Insulation Class: THWN

+/- Impedance: 0.2020 + J 0.0585 Ohms/1000 ft 2.33 + J 0.6761 PU

Z0 Impedance: 0.6366 + J 0.1440 Ohms/1000 ft 7.36 + J 1.66 PU

CBL-0022 CB-EM-CLC2 GUTTER TROUGH 1 480 20.0 FEET 350 Copper

+/- Impedance: 0.0378 + J 0.0491 Ohms/1000 ft 0.3281 + J 0.4262 PU

Z0 Impedance: 0.1191 + J 0.1209 Ohms/1000 ft 1.03 + J 1.05 PU

CBL-0023 GUTTER TROUGH CB-EM-CLC1 (FU 1 480 5.0 FEET 1/0 Copper

+/- Impedance: 0.1280 + J 0.0540 Ohms/1000 ft 0.2778 + J 0.1172 PU

Z0 Impedance: 0.4034 + J 0.1329 Ohms/1000 ft 0.8754 + J 0.2884 PU

CBL-0024 GUTTER TROUGH CB-C 1 480 5.0 FEET 1/0 Copper

+/- Impedance: 0.1280 + J 0.0540 Ohms/1000 ft 0.2778 + J 0.1172 PU

Z0 Impedance: 0.4034 + J 0.1329 Ohms/1000 ft 0.8754 + J 0.2884 PU

CBL-0025 GUTTER TROUGH CB-L 1 480 5.0 FEET 2 Copper

+/- Impedance: 0.2020 + J 0.0585 Ohms/1000 ft 0.4384 + J 0.1270 PU

Z0 Impedance: 0.6366 + J 0.1440 Ohms/1000 ft 1.38 + J 0.3125 PU

CBL-0026 CB-L ATS-L (E) 1 480 10.0 FEET 2 Copper

CBL-0027 CB-C ATS-C (E) 1 480 10.0 FEET 1/0 Copper

Aug 08, 2017 10:21:48 Page 5

TRANSFORMER INPUT DATA

TRANSFORMER PRIMARY RECORD VOLTS * SECONDARY RECORD VOLTS FULL-

LOAD NOMINAL

NAME NO NAME L-L NO NAME L-L KVA KVA

XFMR T-CL1 XFMR T-CL1 PRI D 480.00 XFMR T-CL1 SEC YG 208.00 112.50 75.00

Pos. Seq. Z%: 1.03 + J 3.25 (Zpu 13.73 + j 43.34) Shell Type

Zero Seq. Z%: 1.03 + J 3.25 (Sec 13.73 + j 43.34 Pri Open)

Taps Pri. 0.000 % Sec. 0.000 % Phase Shift (Pri. Leading Sec.): 30.00 Deg.

XFMR T-LL1 XFMR T-LL1 PRI D 480.00 XFMR T-LL1 SEC YG 208.00 112.50 15.00

Pos. Seq. Z%: 1.32 + J 3.26 (Zpu 88.07 + j 217.5) Shell Type

Zero Seq. Z%: 1.32 + J 3.26 (Sec 88.07 + j 217.5 Pri Open)

XFMR T-NL1 XFMR T-NL1 PRI D 480.00 XFMR T-NL1 SEC YG 208.00 112.50 112.50

Pos. Seq. Z%: 1.27 + J 4.30 (Zpu 11.26 + j 38.20) Shell Type

Zero Seq. Z%: 1.27 + J 4.30 (Sec 11.26 + j 38.20 Pri Open)

Aug 08, 2017 10:21:48 Page 6

GENERATION CONTRIBUTION DATA

BUS CONTRIBUTION VOLTAGE

NAME NAME L-L MVA X"d X/R

MDBU MDBU SC 480.00 23.01

Three Phase Contribution: 27680.0 AMPS 6.02

Single Line to Ground Contribution: 27756.0 AMPS 5.10

Pos Sequence Impedance (100 MVA Base) 0.7121 + J 4.29 PU

Zero Sequence Impedance (100 MVA Base) 1.08 + J 4.18 PU

SBCM SBCM SC 480.00 11.23

Three Phase Contribution: 13512.0 AMPS 4.65

Single Line to Ground Contribution: 11496.0 AMPS 3.49

Pos Sequence Impedance (100 MVA Base) 1.87 + J 8.70 PU

Zero Sequence Impedance (100 MVA Base) 4.90 + J 12.77 PU

Aug 08, 2017 10:21:48 Page 7

MOTOR CONTRIBUTION DATA

BUS CONTRIBUTION VOLTAGE BASE Motor

NAME NAME L-L kVA X"d X/R Number

AHU-1 (EP1) VF AHU-1 (EP1) 480 20.05 0.1531 10.0 1.00

Pos Sequence Impedance (100 MVA Base) 76.33 + j 763.36 PU

AHU-1 (EP2) VF AHU-1 (EP2) 480 10.03 0.1531 10.0 1.00

Pos Sequence Impedance (100 MVA Base) 152.67 + j 1526.72 PU

CH-1 DISC CH-1 480 63.87 0.1531 10.0 1.00

Pos Sequence Impedance (100 MVA Base) 23.97 + j 239.67 PU

Short-Circuit Report

Aug 09, 2017 08:20:58

ALL INFORMATION PRESENTED IS FOR REVIEW, APPROVAL

INTERPRETATION AND APPLICATION BY A REGISTERED ENGINEER ONLY

SKM DISCLAIMS ANY RESPONSIBILITY AND LIABILITY RESULTING

FROM THE USE AND INTERPRETATION OF THIS SOFTWARE.

SKM POWER*TOOLS FOR WINDOWS

SHORT CIRCUIT ANALYSIS REPORT

COPYRIGHT SKM SYSTEMS ANALYSIS, INC. 1995-2016

Aug 09, 2017 08:20:58 PAGE 2

ALL PU VALUES ARE EXPRESSED ON A 100 MVA BASE

SWING GENERATORS

BUS NAME SOURCE NAME VOLTAGE ANGLE

MDBU MDBU SC 1.00 0.00

SBCM SBCM SC 1.00 0.00

Aug 09, 2017 08:20:58 PAGE 3

************* P R E - F A U L T V O L T A G E P R O F I L E **************

BUS# NAME BASE VOLTS PU VOLTS ANGLE (D)

AHU-1 (EP1) VF 480.00 1.0000 0.

AHU-1 (EP2) VF 480.00 1.0000 0.

ATS-C BUS 480.00 1.0000 0.

ATS-L BUS 480.00 1.0000 0.

CB-C 480.00 1.0000 0.

CB-EM-CLC1 (FU 480.00 1.0000 0.

CB-EM-CLC2 480.00 1.0000 0.

CB-L 480.00 1.0000 0.

CH-1 DISC 480.00 1.0000 0.

GUTTER TROUGH 480.00 1.0000 0.

LTG CNTRL LCP1 480.00 1.0000 0.

MDBU 480.00 1.0000 0.

MSB-CLC2 480.00 1.0000 0.

PANEL CH1 480.00 1.0000 0.

PANEL CL1 208.00 1.0000 -30.

PANEL CL2 208.00 1.0000 -30.

PANEL LH1 480.00 1.0000 0.

PANEL LL1 208.00 1.0000 -30.

PANEL NH1 480.00 1.0000 0.

PANEL NL1 208.00 1.0000 -30.

PANEL NL2 208.00 1.0000…