mechanical and electrical engineering consultants · 4.3 circuit breaker settings lt delay id frame...

Mechanical and Electrical Engineering Consultants

POWER STUDIES

8150 North Central Expressway M-2100 Campbell Centre Dallas Texas 75206Tel 214-739-8880 Fax 214-739-1777 Toll Free 877-620-2890 www.jjainc.com

Texas Registered Engineering Firm # F-1290

Engineering Since 1978

Market ServicesPower Systems MEP Engineering

JJA, Inc. is a leading Mechanical and Electrical Engineering Consulting firm established in 1978 in Dallas, Texas providing engineering design of HVAC, Plumbing Fire Suppression, Electrical Distribution and Critical Power Systems, Lighting systems, Life Safety systems, Sustainable Designs, Energy Modeling and MEP System Commissioning.

JJA holds Professional Engineering registrations in over 30 states, providing services locally, regionally, and nationally. JJA also performs national on-call MEP services for several corporate Clients.

JJA is committed to sustainable design solutions, utilizing innovative engineering design processes that focus on the life cycle performance for MEP Systems.

JJA is dedicated to servicing our clients with integrity and responsiveness, while providing a collaborative TEAM solution.

JJA, Inc.Company Profile

JJA is a leading consulting engineering firm established in 1978 in Dallas, Texas, and has been providing power system analysis since our inception with an emphasis added to ArcFlash Hazard Assessments in 2003. We have standardized on the use of EasyPower® software, developed by ESA, Inc. located in Portland, Oregon. The analysis is based on the NFPA-70E and IEEE-1584 standards, which require a detailed model be developed for the electrical distribution system.

JJA has performed Power System Studies for mission critical facilities, commercial office buildings, corporate campuses, industrial, manufacturing, and corporate campus projects. Power System Analysis performed by JJA includes an overview of the electrical distribution system using three (3) separate but integrated steps. Each step of the study; the Short Circuit Study, the Coordination Study and the Arc Flash Study, work together to determine potential concerns and possible methods of improving the selective coordination of the electrical distribution system and provides labeling compliance with permanent labeling of the equipment per NFPA 70E and OSHA.

JJA is committed to providing a safe working environment for our Clients by providing a complete electrical distribution system power study.

Maryland

Texas

Oklahoma

Kansas

Arkansas

Georgia

Florida

OhioIowa

MissouriColorado

New MexicoArizona

Utah

Idaho

Nevada

Washington

Oregon

Illinois

Wisconsin

Minnesota

California

Louisiana

Alabama

Tennessee

Kentucky

Mississippi

North CarolinaSouth

Carolina

Pennsylvania

West Virginia

Virginia

Dallas

Indiana

AT&T Bank of AmericaBNSF RailwayCapital GroupChaseDigital Realty TrustFederal Home Loan Bank

Power Study Clients - Partial ListingFlextronicsHolman BoilerHunt OilNortelRackspaceUUNetViaWest

Power System Study

Short Circuit Study

Coordination Study

Arc Flash Study

Power Systems Services

JJA, Inc.Power Systems - At a Glance

Engineering Design = Understanding PerformanceJJA is extremely qualified to perform power system design and analysis on a variety of electrical distribution system types, system complexity, and size. With our strong roots in the engineering design of electrical distribution system, and focus on mission critical applications, we understand electrical infrastructure configurations, modes of operations, and how system should perform or operate under normal, emergency, and fault conditions.

EasyPower = Industry PartnershipIn 1998 JJA standardized on EasyPower, as developed by EAS, Inc, as our Window’s based computer analytical software to be used for our power system analysis. The software is based on IEEE 1584 and NFPA-70E requirements and provides excellent resources and formatted output. Our partnership with ESA, Inc. includes their involvement in code committees at both IEEE & NFPA, continual software updates as standards are modified, technical support and intensive training of JJA personnel. ESA, Inc. offers “Safety Tracker” software that allows end users to develop energized work permits based on NFPA-70E using the calculated arc flash energy for all the various operating modes presented in our reports.

Power System StudyA Power System Study is used to provide a complete overview of the electrical distribution system using three (3) separate but integrated steps. Each step of the study; the Short Circuit Study, the Coordination Study and the Arc Flash Study, work together to determine potential concerns and possible methods of improving the selective coordination of the electrical distribution system and provides labeling compliance with permanent labeling of the equipment per NFPA and OSHA.

Short Circuit StudyThe Short Circuit Study is used to determine if all electrical components of the distribution system are rated properly for the anticipated fault currents. Multiple operational scenarios are considered in the Short Circuit Study to validate the worse case conditions. NEC 110.9 and NFPA 70E both require that the rating of the equipment be sufficient for interrupting the maximum available fault current and that the equipment be able to withstand or interrupt the fault currents at the point of use.

Coordination StudyThe Coordination Study is used to illustrate and document the circuit breaker settings throughout the electrical distribution system. The Coordination Study will determine the time and current values at which a circuit breaker should trip. This part of the study will determine the order in which circuit breakers trip and evaluates the selective coordination of the circuit breakers. Circuit breaker trip settings are an important part in generating the results of the arc flash study, since the time it takes to trip a circuit breaker affects the time an arc will be sustained and ultimately determines the arc flash hazard.

Arc Flash StudyAn arc flash is an electrical discharge that uses the air as a conductor, due to a fault between a phase bus bar and another phase bus bar, neutral or ground.

The massive energy discharge from an arc flash event will cause metal to vaporize and thus causing an explosive volumetric increase in pressure conservatively estimated as an expansion of 40,000 to 1. The metal of buss bars and conductor can often be melted or even vaporized, leading to explosively hot gas and molten metal being dispersed through the air. This could result in serious injury, property damage or even death. This is why it is important to have properly selected over-current protective devices and a proper coordination between these devices to handle the arc fault conditions. In addition to the calculation, guidance to the required level of Personnel Protective Equipment (PPE) is provided and documented with the use of OSHA warning labels.

Mechanical and Electrical Engineering Consultants

8150 N. Central ExpwyM-2100 Campbell CentreDallas, Texas 75206Tel 214-739-8880Toll Free 877-620-2890Fax 214-739-1777www.jjainc.com

HVAC SystemsUnderfloor Air SystemsThermal Storage SystemsBuilding AutomationPlumbing SystemsElectrical Power DistributionLighting SystemsEmergency Power SystemsCritical Systems Coordination StudiesEnergy ModelingFire SuppressionLife Safety SystemsSustainable Design BIM Production

Design Services

Facility Assessments Life Cycle Cost AnalysisElectrical Power StudiesSystem CommissioningDocument ReviewsLEED ConsultingValue Engineering

Consulting Services

Corporate / Office InteriorsCritical SystemsEducationHospitality / ResidentialAutomotivePower StudiesCommissioningHealthcareRetail / Mixed-Use Government / MunicipalManufacturing / Industrial

MarketsOffice

Contacts

Mechanical Engineering Electrical Engineering Plumbing & Fire Suppression Certified Commissioning AgentsTexas Registered Engineering Firm # F-1290

4.3 CIRCUIT BREAKER SETTINGS

LT Delay

IDManufacture Type

StyleFrame/ Tap/ Setting Mult Trip Band Setting Trip Band I2t Setting Overrid Trip Pickup Trip Delay I2t

DP140A-1GE

Spectra RMS MCCB SE 60A (60AT) 60 11 60 Fixed Max 456 Fixed In Max Pickup 750

Out

DP140A-2GE

Spectra RMS MCCB SE 60A (60AT) 60 11 60 Fixed 5 228 Fixed In 5 Pickup 462

Out

DP140B-1GE


Out

DP140B-2GE

Spectra RMS MCCB SE 60A (60AT) 60 11 60 Fixed 5 228 Fixed In 5 Pickup 462

Out

DP140MA-1GE


Out

DP140MA-2GE


Out

DP140MA-3GE


Out

DP140MB-1GE


Out

DP140MB-2GE


Out

DP140MB-3GE


Out

GCB-140B-1GE

MVT-PlusICCB

3000 3000 13000 4

5.5 19500 Max Out 5.5 Pickup 19500 0.35 1050 Max In

GCB-140B-2GE

MVT-PlusICCB

3000 3000 13000 4


GCBRG2-1GE

MVT-PlusICCB

3000 3000 13000 4


GCBRG2-2GE

MVT-PlusICCB

3000 3000 13000 4


SW-140 GEN G1GE

MVT-PlusICCB

3000 3000 13000 4


SW-140 UTIL M1GE

MVT-PlusICCB

3000 3000 13000 4


SW-140A MAINGE

MVT-PlusICCB

3000 3000 13000 3

4.5 15000 Max Out 4.5 Pickup 15000 0.23 690 Int In

SW-140A-1GE

MVT-PMMCCB

800800 1

8004

4 3200 0.4 Out 4 Pickup 3200 0.6 480 1 Out

SW-140A-2GE

MVT-PMMCCB

800800 0.5

4004

4 1600 0.4 Out 4 Pickup 3200 0.3 240 1 Out

SW-140A/B TIEGE

MVT-PlusICCB

3000 3000 13000 2


SW-140B MAINGE

MVT-PlusICCB

3000 3000 13000 3

4.5 15000 Max Out 4.5 Pickup 15000 0.23 690 Int In

SW-140B-1GE

MVT-PMMCCB

800800 1

8004

4 3200 0.4 Out 4 Pickup 3200 0.6 480 1 Out

SW-140B-2GE

MVT-PMMCCB

800800 0.5

4004

4 1600 0.4 Out 4 Pickup 3200 0.3 240 1 Out

SW-UPS140AGE

MVT-PlusICCB

1600 1600 11600 3

5 8000 Min Out 5 Pickup 8000 0.2 320 Min Out

SW-UPS140A-1GE

MVT-PMMCCB

600600 0.85

5103

3 1530 0.2 Out 6.5 Pickup 3900 1 600 1 Out

SW-UPS140A-2GE

MVT-PMMCCB

600600 0.85

5103

3 1530 0.2 Out 6.5 Pickup 3900 1 600 1 Out

SW-UPS140BGE

MVT-PlusICCB

1600 1600 11600 3


SW-UPS140B-1GE

MVT-PMMCCB

600600 0.85

5103

3 1530 0.2 Out 6.5 Pickup 3900 1 600 1 Out

SW-UPS140B-2GE

MVT-PMMCCB

600600 0.85

5103

3 1530 0.2 Out 6.5 Pickup 3900 1 600 1 Out

UPS140AGE

MVT-PlusICCB

1600 1600 11600 3


UPS140A BYPASS Merlin Gerin Masterpact NW Micrologic 6.0 2000 2000 0.81600 20

5 9600 0.4 Out 5 Pickup 12000 A 500 0.2 In

UPS140BGE

MVT-PlusICCB

1600 1600 11600 3


UPS140B BYPASS Merlin Gerin Masterpact NW Micrologic 6.0 2000 2000 0.81600 20

5 9600 0.4 Out 5 Pickup 12000 A 500 0.2 In

IDManufacturer

TypeStyle

FrameTrip Setting Trip (A)

H140A MAINGE

E150TEY

100A (50A) 50

H140B MAINGE

E150TEY

100A (50A) 50

L140A MAINGE

Q LineTHQB

100(60- 100

L140B MAINGE

Q LineTHQB

100(60- 100

LUPS140 MAINGE

Q LineTHQB

100(60- 100

PDU140A1SQD

K FrameKAL 250A (225AT) 225 2250 2250

PDU140A2SQD

K FrameKAL 250A (225AT) 225 2250 2250

PDU140B1SQD

K FrameKAL 250A (225AT) 225 2250 2250

PDU140B2SQD

K FrameKAL 250A (225AT) 225 2250 2250

UPS-140A1 Q1SQD

P FramePHF 2000 (1200T) 1200 5700 5700

UPS-140B1 Q1SQD

P FramePHF 2000 (1200T) 1200 5700 5700

UPS140A1 Q5NSQD

M FrameMHL

1000A 1000 5000 5000

UPS140B1 Q5NSQD

M FrameMHL

1000A 1000 5000 5000

SST

Thermal Magnetic Breaker

InstGround Trip

Instantaneous

Circuit Breaker SettingsLTPU

STPU

4-4

5.3 ARC FLASH HAZARD COMPARISON REPORT (AFCR)

Bus/ParameterNormal Utility

Emergency GeneratorRedundant Generator

Redundant Utility

BUS:ATS-140A-CRAH-11

Worst Case

Base kV

0.48

0.48

0.48

0.48

Bolted Fault(kA)

8.392

8.08

8.392

8.44

Est. Arc Fault(kA)

5.441

5.273

5.441

5.467

Est. Arc Flash Boundary(in)

7.561

7.392

7.561

7.587

Working Distance(in)

18

18

18

18

Incident Energy(cal/cm2)

0.418

0.404

0.418

0.42

Required Clothing Class

#0

#0

#0

#0


Worst Case

Base kV

0.48

0.48

0.48

0.48

Bolted Fault(kA)

8.392

8.08

8.392

8.44

Est. Arc Fault(kA)

5.441

5.273

5.441

5.467


7.561

7.392

7.561

7.587


18

18

18

18


0.418

0.404

0.418

0.42


#0

#0

#0

#0


Worst Case

Base kV

0.48

0.48

0.48

0.48

Bolted Fault(kA)

2.444

2.434

2.444

2.448

Est. Arc Fault(kA)

1.948

1.941

1.948

1.95


3.57

3.562

3.57

3.573


18

18

18

18


0.138

0.138

0.138

0.139


#0

#0

#0

#0

BUS:ATS-140A-CRAH-1

Worst Case

Base kV

0.48

0.48

0.48

0.48

Bolted Fault(kA)

21.04517.027

21.04521.429

Est. Arc Fault(kA)

11.703

9.8111.703

11.881


13.25211.648

13.25213.399


18

18

18

18


0.955

0.79

0.955

0.971


#0

#0

#0

#0

BUS:ATS-140A-CRAH-3

Worst Case

Base kV

0.48

0.48

0.48

0.48

Bolted Fault(kA)

21.04517.027

21.04521.429

Est. Arc Fault(kA)

11.703

9.8111.703

11.881


13.25211.648

13.25213.399


18

18

18

18


0.955

0.79

0.955

0.971


#0

#0

#0

#0

BUS:ATS-140A-CRAH-5

Worst Case

Base kV

0.48

0.48

0.48

0.48

Bolted Fault(kA)

23.03618.108

23.03623.505

Est. Arc Fault(kA)

12.61910.326

12.61912.832


14.00412.094

14.00414.177


18

18

18

18


1.036

0.835

1.036

1.055


#0

#0

#0

#0

BUS:ATS-140A-CRAH-7

Worst Case

Base kV

0.48

0.48

0.48

0.48

Bolted Fault(kA)

25.393

19.2825.393

25.972

Est. Arc Fault(kA)

13.685

10.8813.685

13.945


14.86212.565

14.86215.068


18

18

18

18


1.131

0.883

1.131

1.154


#0

#0

#0

#0

BUS:ATS-140A-CRAH-9

Worst Case

Base kV

0.48

0.48

0.48

0.48

Bolted Fault(kA)

8.392

8.08

8.392

8.44

Est. Arc Fault(kA)

5.441

5.273

5.441

5.467


7.561

7.392

7.561

7.587


18

18

18

18


0.418

0.404

0.418

0.42


#0

#0

#0

#0

BUS:ATS-140A

Worst Case

Base kV

0.48

0.48

0.48

0.48

Bolted Fault(kA)

46.21225.672

46.21248.141

Est. Arc Fault(kA)

22.535

13.8122.535

23.315


21.4514.996

21.4521.991


18

18

18

18


1.942

1.146

1.942

2.015


#1

#0

#1

#1

Arc Flash Hazard Comparison Report

5-7

COORDINATION REPORT

George Laity, PE, CxADirector of EngineeringDirect [email protected]

Laurence Basceanu, PE, LEED APElectrical EngineeringDirect [email protected]

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