Post on 26-Mar-2015
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??