Selective Coordination
Productivity Through
Protection Seminar Series
Agenda
Selective Coordination
 What is selective coordination
 Mandatory Requirements
 Why mandatory
 How to comply with fuses
 Benefits of fusible system
 Cooper Bussmann solutions
 Resources
3
What is Selective Coordination
 For the full range of
possible overcurrents
 Only closest upstream
overcurrent protective
device from overcurrent
opens
 Other upstream (larger)
overcurrent protective
devices do not open
LINE SIDE
LOAD SIDE
KRP-C-1200SP
LPS-RK-600SP
Fault
Only this
fuse opens
4
Selective Coordination (NEC®)
Article 100 Definition
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.
Article 700 Emergency Systems
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)
5
Selective Coordination System Prospective
Without Selective Coordination
Loads Unnecessarily Blacked Out
With Selective Coordination
No Unnecessary Load Blackouts
OPENS
Opens
Fault
NOT
AFFECTED
Fault
Not Affected
Unnecessary Power Loss
6
Lack of Selective Coordination
CURRENT IN AMPERES
1000
D
100
100A Fuse
TIME IN SECONDS
 Many people mistakenly
assume that a lower
ampere rated fuse will
always open before a
larger ampere rated fuse
100A
45A 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
100A
45A
45A
1
0.10
0.1s
0.01
0.01s
10
100
1K
tcc1.tcc Ref. Voltage: 480 Current in Amps x 1
10K
7
Lack of Selective Coordination
CURRENT IN AMPERES
1000
100
800
200A MCCB 35kAIR
X
800A MCCB 35kAIR
200
10
200A
30A
30
X
 Where the circuit breakers
cross, it is interpreted to
not be selectively
0.1
0.10
coordinated See
1
0.01
TIME IN SECONDS
 Many people mistakenly
assume that a lower
ampere rated circuit
breaker will always open
before a larger ampere
rated circuit breaker
800A
30A MCCB 18kAIR
0.01
10
100
1K
10K
100K
8
30 200 800 MCCB.tcc Ref. Voltage: 480 Current in Amps x 1 30 200 800 MCCB.drw
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
With Selective Coordination
No Unnecessary Load Blackouts
OPENS
NOT
AFFECTED
Fault
building types and then usually only
few circuits)
9
Summary of Requirements: Selective Coordination
Selective Coordination requirements
100
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)
10
Selective Coordination Requirements
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
Fault
OPENS
NOT AFFECTED11
Selective Coordination Includes the
Entire Circuit Path, Thru Both Sources
Normal
Source
Alternate
Source
1. From a vital load to the alternate
source, the OCPDs shall be
selectively coordinated
N
E
ATS
Panel
12
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
“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
Normal
Source
Alternate
Source
N
E
ATS
Panel
13
Selective Coordination Requirements
 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
14
How to Selectively
Coordinate with Fuses?
Let’s take a look at what it takes to
selectively coordinate fuses
15
Selective Coordination- Fuses
1200A Fuse
Melting
LINE SIDE
KRP-C-1200SP
Tm
LOAD SIDE
Tc
LPS-RK-600SP
1200A fuse melting energy
must be greater than
600A fuse clearing energy
AVAILABLE
SHORT-CIRCUIT
CURRENT
600A Fuse
Clearing
Tc
16
Selective Coordination
(SPD p112)
Line Side Fuse
Load Side Fuse
LOW-PEAK® : LOW-PEAK®
2:1 Line:Load Ratio
No plotting required!
17
Fuse Selectivity Ratio Example 1
Circuit Path Selectively
Coordinated
Loadside Fuse
Low-Peak®
KRP-C-800SP
Low-Peak
LPJ-400SP
Low-Peak
LPJ-100SP
Overloads or faults
of any level up to
200,000A
KRP-C_SP LPJ_SP
KRP-C_SP
2:1
2:1
2:1
LPJ_SP
-
2:1
800/400 = 2:1 only 2:1 needed
Selective Coordination achieved
400/100= 4:1 only 2:1 needed
Selective Coordination achieved
between these two fuses
18
Fuse Selectivity Ratio Example 2
 What about branch panelboard applications, such as lighting?
 Use the Quik-Spec™ Coordination Panelboard
Low-Peak
KRP-C-800SP
Low-Peak
LPJ-200SP
Low-Peak CUBEFuse
TCF20RN
Branch circuits:
CCPB disconnect
with CUBEFuse
19
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
20
Selective Coordination Cooper Bussmann Fuses
 Recommend design:
– TCF(amp)RN
CUBEFuse®
– LPJ(amp)SP
Class J
– LPS-RK(amp)SP Class RK1
LPN-RK(amp)SP
– KRP-C(amp)SP Class L
1 to 60A (Branch Panel)
1 to 600A
1 to 600A
601 to 6000A
CUBEFuse
TCF(amp)RN
LPJ(amp)SP
KRP-C(amp)SP
LPS-RK(amp)SP
21
Quik-Spec™
Product Family
22
The New Standard in Fusible Panelboards
• Simplifies
Selective
Coordination
• Better Value
• Smaller
Footprint
• Additional
Main Options
• Patented Fuse
Rejection,
Interlock and
Indication
23
Quik-Spec™ Coordination Panelboard Callouts
Single “QSCP” Part Number
600Vac / 200A w/ Fusible
&Non-Fusible Main or MLO
18, 30 & 42 Branch Circuit
Positions w/ Space Options
Available
50kA, 100kA & 200kA
SCCR
Isolated or Non-Isolated
Ground Option
Finger-safe CUBEFuse® CCPB
for Branch Circuit Protection
200A or 400A Neutral
Option
Feed-Through & SubFeed Through Lugs Option
Up to 60A Branch Circuits
& 1-, 2-, 3-pole options
NEMA 1 & 3R
Surface and flush mount
Removable Branch Knockouts
Top and bottom feed
Door-in-door options
Spare Fuse Holder w/ Spare
Fuses Included w/ Each Panel
20” width x 50” to 60½”
height x 5 ¾” depth
20”
Advance Shipment of Cans Available
24
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
25
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
Power
Module
Switch
(PS)
Power
Module
Panel
(PMP)
– 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
26
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 arcflash 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
27
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
28
PTP Tour Special Offer
1-Year, No Cost Subscription to OSCAR™ 2.0 Compliance Software
Speeds Code & Agency Marking Requirements
This award winning, online, essential design tool allows you to comply quickly and accurately with 2008 NEC®
and UL 508A Supplement SB for assembly SCCR marking requirements:
• Industrial Control Panels [409.110]
• Industrial Machinery Electrical Panels [670.3(A)]
• HVAC Equipment [440.4(B)]
New Project Management Features:
• Simplify your panel design and project organization.
• Save and edit existing panel designs.
• Save multiple panels under a single project.
• Copy existing panels to new projects.
New Intuitive Navigation:
• Display your one-line diagram.
• Select from pre-loaded circuit templates.
• Identify the weakest link component automatically.
• Print reports and one-line diagrams for required SCCR documentation.
• Utilize mouse-over tips to enhance your design.
Design with Confidence:
• Logic updated to current UL requirements.
• Search by partial part number or device rating.
• Extensive 55,000+ component database.
• Custom device option allows for entering specialized
component rating information.
Get Your 1-Year, No Cost Subscription
Be sure to register for this presentation and include your e-mail address.
Details will be e-mailed to you within 7 to 10 business days.
29
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 Fuses
Section 2 - Applying Interrupting Ratings
Section 3 - Conductor Protection
Section 4 - Industrial Control Panels
Section 5 - Selective Coordination
Section 6 - Electrical Safety
Section 7 - Devices for Motor Circuits
Section 8 - Cost of Ownership, Calculations & Sizing Charts
Visit www.cooperbussmann.com/spd
30
Quik-Spec™
Product Family
Questions??
31