1 Notes Total of 28 slides Aids to assist in developing your presentation: SPD08 Selective Coordination Section p108-146, Quik-Spec Family Brochure, QSCP.

Selective Coordination

Productivity Through Protection Seminar Series

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Agenda

Selective Coordination What is selective coordination Mandatory Requirements Why mandatory How to comply with fuses Benefits of fusible system Cooper Bussmann solutions Resources

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What is Selective Coordination

For the full range of possible overcurrents

LINE SIDE

LOAD SIDE

KRP-C-1200SP

LPS-RK-600SP

Only closest upstream overcurrent protective device from overcurrent opens

Other upstream (larger) overcurrent protective devices do not open Fault

Only this fuse opens

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Selective Coordination (NEC®)

Article 100 Definition

Article 700 Emergency Systems

Coordination (Selective) Localization of an overcurrent condition to restrict outages to the circuit or equipment affected, accomplished by the choice of overcurrent protective devices and their ratings or settings.

700.27 Coordination. Emergency system(s) overcurrent devices shall be selectively coordinated with all supply side overcurrent protective devices(Two exceptions apply for 700.27 and 701.18)

(Wording for 701.18 and 708.54 is the similar except for the type system)

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Without Selective Coordination With Selective Coordination Loads Unnecessarily Blacked Out No Unnecessary Load Blackouts

Opens

Not Affected

Unnecessary Power Loss

OPENS

NOT AFFECTEDFault Faul

t

Selective Coordination System Prospective

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Lack of Selective Coordination Many people mistakenly

assume that a lower ampere rated fuse will always open before a larger ampere rated fuse

If fuse curves cross, larger upstream fuse and downstream fuse can both open for overcurrents on the loadside of 45A fuse

(not selectively coordinated)

10 100 1K 10K0.01

0.10

1

10

100

1000

CURRENT IN AMPERES

tcc1.tcc Ref. Voltage: 480 Current in Amps x 1

TIME

IN S

EC

ON

DS

100A Fuse

45A Fuse

100A Fuse

45A Fuse

0.1s

100A

45A

0.01s

D

45A

100A

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Lack of Selective Coordination

Many people mistakenly assume that a lower ampere rated circuit breaker will always open before a larger ampere rated circuit breaker

Where the circuit breakers cross, it is interpreted to not be selectively coordinated See

10 100 1K 10K 100K0.01

0.10

1

10

100

1000

CURRENT IN AMPERES

30 200 800 MCCB.tcc Ref. Voltage: 480 Current in Amps x 1 30 200 800 MCCB.drw

TIM

E IN

SE

CO

ND

S

30A MCCB 18kAIR

200A MCCB 35kAIR

800A MCCB 35kAIR

30A MCCB 18kAIR

200A MCCB 35kAIR

800A MCCB 35kAIR

0.01

0.1

30200

800

30A

X

X

800A

200A

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With Selective Coordination No Unnecessary Load Blackouts

OPENS

NOT AFFECTED Faul

t

Selective Coordination System

To achieve selective coordination for electrical systems requires engineering analysis and proper overcurrent protective device selection

For most electrical systems, selective coordination is a desirable design consideration

For some electrical systems, selective coordination is mandatory (limited number of building types and then usually only few circuits)

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Summary of Requirements: Selective Coordination

Selective Coordination requirements100 Definition: Coordination Selective (2005)

517.26 Required for Essential Electrical Systems (2005)

620.62 Required for Circuits with multiple Elevators (1993)

700.9(B)(5)(b) Exception. OCPDs permitted at alternate source or for equipment (2008)

700.27 Required for Emergency Systems (2005)

701.18 Required for Legally Required Standby Systems (2005)

708.54 Required for Critical Operations Power Systems (COPS) (2008)

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Why?• Increases system reliability to deliver power • Focus on the load!

Availability of power to vital loads as long as possible

• Life Safety• Public safety and national security (COPS)• Increases system reliability to power vital

loads even during emergencies and disasters• Facilitates restoration of power to affected

loads

OPENS NOT AFFECTED

Fault

Selective Coordination Requirements

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Selective Coordination Includes the Entire Circuit Path, Thru Both Sources

1. From a vital load to the alternate source, the OCPDs shall be selectively coordinated

ATS

AlternateSource

N E

NormalSource

Panel

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Selective Coordination Includes the Entire Circuit Path, Thru Both Sources

1.From a vital load to the alternate source, the OCPDs shall be selectively coordinated

2.For a vital load to the normal source main, the OCPDs shall be selectively coordinated ATS

AlternateSource

N E

NormalSource

Panel

“Emergency system(s) overcurrent devices shall be selectively coordinated with all supply side overcurrent protective devices”This wording is inclusive of the the normal source path OCPDs

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NEC® 620.62 Elevator Circuits (since 1993)

– Requires selective coordination on circuit paths when multiple elevators are on a feeder. Required since 1993 to ensure safety of human life especially during emergency egress

Purpose of this requirement?– Maximize continuity of service– Quicker restoration of power

Selective Coordination Requirements

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How to Selectively Coordinate with Fuses?

Let’s take a look at what it takes to selectively coordinate fuses

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Selective Coordination- Fuses

LINE SIDE

LOAD SIDE

KRP-C-1200SP

LPS-RK-600SP

600A FuseClearing

AVAILABLE SHORT-CIRCUIT CURRENT

Tc

TmTc

1200A FuseMelting

1200A fuse melting energy

must be greater than

600A fuse clearing energy

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Selective Coordination

No plotting required!

LOW-PEAK® : LOW-PEAK®

2:1 Line:Load RatioLin

e S

ide

Fu

se

Load Side Fuse(SPD p112)

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Fuse Selectivity Ratio Example 1

Overloads or faults of any level up to

200,000A

Low-Peak®KRP-C-800SP

Low-PeakLPJ-400SP

Low-PeakLPJ-100SP

KRP-C_SP LPJ_SP

KRP-C_SP 2:1 2:1

LPJ_SP - 2:1

Loadside Fuse

Lin

esid

e F

use

KRP-C_SP LPJ_SP

KRP-C_SP 2:1 2:1

LPJ_SP - 2:1

400/100= 4:1 only 2:1 neededSelective Coordination achieved between these

two fuses

800/400 = 2:1 only 2:1 neededSelective Coordination achieved

Circuit Path Selectively Coordinated

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What about branch panelboard applications, such as lighting? Use the Quik-Spec™ Coordination Panelboard

Fuse Selectivity Ratio Example 2

Low-PeakKRP-C-800SP

Low-PeakLPJ-200SP

Low-Peak CUBEFuseTCF20RN

Branch circuits:CCPB disconnect with CUBEFuse

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Benefits of Fuse Selective Coordination

It is simple with Cooper Bussmann fuses Just follow the fuse selectivity ratios: 2:1 for Low-Peak®

Fuses No need to do complex short-circuit current studies (up to

200kA) No need to plot time-current curves to analyze fuse

selective coordination: use the selectivity ratios

In addition:– High interrupting rating– Excellent current-limitation– Excellent protection of components– Arc flash mitigation

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Selective Coordination Cooper Bussmann Fuses Recommend design:

– TCF(amp)RN CUBEFuse® 1 to 60A (Branch Panel)

– LPJ(amp)SP Class J 1 to 600A– LPS-RK(amp)SP Class RK1 1 to 600A

LPN-RK(amp)SP– KRP-C(amp)SP Class L 601 to 6000A

KRP-C(amp)SP

LPJ(amp)SP

LPS-RK(amp)SP

CUBEFuseTCF(amp)RN

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Quik-Spec™ Product Family

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The New Standard in Fusible Panelboards

• Simplifies Selective Coordination

• Better Value

• Smaller Footprint

• Additional Main Options

• Patented Fuse Rejection, Interlock and Indication

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18, 30 & 42 Branch Circuit Positions w/ Space Options Available

Up to 60A Branch Circuits & 1-, 2-, 3-pole options

600Vac / 200A w/ Fusible &Non-Fusible Main or MLO

50kA, 100kA & 200kA SCCR

Isolated or Non-Isolated Ground Option

200A or 400A Neutral Option

Feed-Through & Sub-Feed Through Lugs Option

NEMA 1 & 3R

Surface and flush mount

Top and bottom feed

Door-in-door options

20” width x 50” to 60½” height x 5 ¾” depth

Finger-safe CUBEFuse® CCPB for Branch Circuit Protection

Removable Branch Knockouts

Spare Fuse Holder w/ Spare Fuses Included w/ Each Panel

Quik-Spec™ Coordination Panelboard Callouts

20”Advance Shipment of Cans Available

Single “QSCP” Part Number

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CUBEFuse® CCPB Branch Details

• Compact Circuit Protector Base (CCPB)• UL Listed fusible branch disconnect (1-, 2- & 3-pole)• Ampacity-rejection prevents overfusing w/ breaks at

15A, 20A, 30A, 40A, 50A & 60A• Interlock prevents fuse removal while energized• Bolt-in design for quick installation to bus• Local open fuse indication on CCPB base • Lockout/Tagout provisions• Lock-On provisions

• Low-Peak® CUBEFuse® Benefits• IP20 finger-safe• Smallest footprint of any power class fuse on the market• Meets Class J time-delay electrical performance for UL/CSA

• 600Vac voltage rating• UL Listed 300kA interrupting rating• Up to 200kA assembly SCCR rating

• Reduces arc-flash hazards and minimizes damage to equipment and circuits when sized properly

• Optional easyID™ open fuse indication

Safety & Convenience in a Small Footprint

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Quik-Spec™ Power Module• Fused Elevator Shunt-Trip

Disconnect• Easy to Specify and Install• UL 98 or 67 Listed Assembly• Simplifies Selective

Coordination• PMP Available for multiple

elevator installations• All-in-one Package

– Interfaces with Fire Safety Systems

– Consistent Component Wiring EVERY TIME

– Saves Time for Contractor, Engineer, & Inspector

• Meets all codes & standards requirements• NEC®, ANSI/ASME, NFPA72

Power Module Switch

(PS)

Power Module Panel(PMP)

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Quik-Spec™ Safety Switch • 600V heavy-duty safety switch

• Available in 30, 60, or 100A, @ 200kA

• With current-limiting Class J CUBEFuse, provides industry best performance against downstream arc-flash hazards

• Provides extra measures of safety from contact with live parts

• Visible double-break quick-make quick-break rotary blade

• Takes workplace safety to the next level

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Resources

Quik-Spec Products– Product profiles– Data sheets– Application Notes for QS Coordination Panel– Flash Demo

Low-Peak® fuse datasheets Selective coordination technical discussion (SPD)

– How to– Selectivity Ratio Guide – SPD selective coordination section download

Voiceover PowerPoint: Why Selective Coordination Third party articles on Selective Coordination www.CooperBussmann.com

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Selecting Protective Devices Handbook (SPD)

This comprehensive guide to electrical overcurrent protection and electrical design considerations is based on the 2008 NEC®

This handbook, with a value of $49.95, is now available free of charge online. Download the entire document or selected sections as needed.

Section 1 - Benefits Offered By FusesSection 2 - Applying Interrupting RatingsSection 3 - Conductor ProtectionSection 4 - Industrial Control PanelsSection 5 - Selective CoordinationSection 6 - Electrical SafetySection 7 - Devices for Motor CircuitsSection 8 - Cost of Ownership, Calculations & Sizing Charts

Visit www.cooperbussmann.com/spd

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Quik-Spec™ Product Family

Questions??