1. Notes
Total of 28 slides
Aids to assist in developing your presentation: SPD08 Selective Coordination Section p , Quik-Spec Family Brochure, QSCP App Note, Product Profiles, and Datasheets

2. Selective Coordination
Productivity Through Protection Seminar Series
There are some hidden slides if you want to tailor to suite your needs. If you want to use a hidden slide, unhide the slide.
There are two hidden slides that are screen captures of the Quik-Spec Coordination Panelboard Flash Demo that could be used.
Aids to assist in developing your presentation: SPD08 Selective Coordination Section p , Quik-Spec Family Brochure, Product Profiles, and Datasheets

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

4. 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
Simply explanation of selective coordination
For the full range of overcurrents
For any overcurrent, only closest overcurrent protective device OCPD opens
Fault
Only this fuse opens

5. 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.
Coordination.
Emergency system(s) overcurrent devices shall be selectively coordinated with all supply side overcurrent protective devices
(Two exceptions apply for and )
(Wording for and is the similar except for the type system)
To further the understand “Selective Coordination”, this provides:
The NEC definition for selective coordination.
In addition is the requirement for selective coordination in emergency systems section
is same requirement for Legally Required Systems
is requirement for Critical Operations Power Systems (COPS). The requirements is the same except there are no exceptions.

6. Selective Coordination System Prospective
Without Selective Coordination With Selective Coordination
Loads Unnecessarily Blacked Out No Unnecessary Load Blackouts
OPENS
Explain the system on the left first and explain there are lots of loads off these feeders. The rectangles represent OCPDs.
Explain the consequences in terms they can relate to. If you have an actual story of an incident it helps understanding.
Selective Coordination is the ability of a system to isolate an overcurrent condition.
Without selective coordination, many or all of the upstream devices can also open causing unnecessary power losses to other non problem loads.
With selective coordination, the device closest to the overcurrent is the only device which opens, unnecessary power loss is avoided.
The concept is easy to understand. Most people just assume that selective coordination is achieved if the upstream overcurrent protective devices have larger ampere ratings. You will discover that this is not the case.
NOT
AFFECTED
Opens
Fault
Fault
Not Affected
Unnecessary Power Loss

7. 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)
Selective coordination is not just any fuse amp rating being larger than the amp rating of a downstream fuse. It has to be properly analyzed.

8. Lack of Selective Coordination
0.01
0.1 30
200
800
30A X
800A
200A
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
A smaller, downstream circuit breaker may not selectively coordinate with larger, upstream circuit breakers, These curves are for molded case circuit breakers which is the majority of circuit breakers sold.

9. 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)
With Selective Coordination No Unnecessary Load Blackouts
OPENS
It is important to make the point that for most systems selective coordination is a desirable design consideration – non mandatory. But what owner would want a built in blackout?
However, the NEC does require selective coordination for a few vital systems – limited to few types of building such as arenas, places of assembly, etc, and a few circuits in those buildings. For healthcare buildings it can represent 40 to 50% of the systems.
NOT
AFFECTED
Fault

10. Summary of Requirements: Selective Coordination
Selective Coordination requirements
100 Definition: Coordination Selective (2005)
Required for Essential Electrical Systems (2005)
Required for Circuits with multiple Elevators (1993)
700.9(B)(5)(b) Exception. OCPDs permitted at alternate source or for equipment (2008)
Required for Emergency Systems (2005)
Required for Legally Required Standby Systems (2005)
Required for Critical Operations Power Systems (COPS) (2008)
Several sections of the 2008 NEC were added to require selective coordination for fuses or circuit breakers on specific systems. The (year) provides the National Electrical Code edition in which the requirement entered the NEC.

11. 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
Selective coordination is now required for increased system reliability, which is vital for these critical systems.
The substantiation for NEC 2005 proposal pertaining to Article 700 Emergency Systems, which was “accept in principle in part” by the Code Panel, provides insight:
“The requirements contained in Article 700 focus on providing a reliable emergency system that will be operational when called upon for its use as supported by the maintenance and testing requirements in The critical nature of the dependence on emergency systems for safety of human life, as stated in the scope, supports these requirements. This article specifically mandates that the emergency circuits be separated from the normal circuits as shown in 700.9(B) and that the wiring be specifically located to minimize system hazards as shown in 700.9(C), all of which reduce the probability of faults or failures to the system so it will be operational when called upon. With the interaction of this article for emergency lighting for egress, it is imperative that the lighting system remains operational in an emergency. Failure of one component must not result in a condition where a means of egress will be in total darkness as shown in In addition, the allowance to bypass the alternative source ground fault protection for equipment shows the preference for system operation in the event of an emergency and the fact that if a fault occurs we do not want the whole system to go down and create an unsafe situation for human life. Selectively coordinated overcurrent protective devices will provide a system that will support all these requirements and principles. With properly selected overcurrent protective devices, a fault in the emergency system will be localized to the overcurrent protective device nearest the fault allowing the remainder of the system to be functional as all the previously mentioned requirements intend to do. Due to the critical nature of the emergency system uptime, selective coordination must be mandated for emergency systems. This can be accomplished by both fuses and circuit breakers based on the system design and the selection of the appropriate overcurrent protective devices.”
Fault
OPENS
NOT AFFECTED

12. Selective Coordination Includes the Entire Circuit Path, Thru Both Sources
Alternate
Source
Normal
Source
From a vital load to the alternate source, the OCPDs shall be selectively coordinated N E
ATS
When alternate source is powering the vital loads, the OCPDs for the entire path from branch circuit to alternate source must be selectively coordinated.
Panel

13. This wording is inclusive of the the normal source path OCPDs
Selective Coordination Includes the Entire Circuit Path, Thru Both Sources
Alternate
Source
From a vital load to the alternate source, the OCPDs shall be selectively coordinated
For a vital load to the normal source main, the OCPDs shall be selectively coordinated
Normal
Source N E
ATS
“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
When normal source is powering the vital loads, the OCPDs for the entire path from branch circuit to service must be selectively coordinated.
Remember, that that the normal OCPDs do not have to selective coordinate between themselves. This is covered in the SPD but not shown in this presentation due to time.
Panel

14. Selective Coordination Requirements
NEC® 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
Required since 1993, the purpose is to avoid stranding passengers on elevators.

15. How to Selectively Coordinate with Fuses?
Let’s take a look at what it takes to selectively coordinate fuses

16. Selective Coordination- Fuses
LINE SIDE
LOAD SIDE
KRP-C-1200SP
LPS-RK-600SP Tm Tc
1200A Fuse
Melting
The black dashed lines represent the fault current that would flow if the fuses were not in the circuit. In the lower curve, the downstream fuse (600A fuse), melts and clears as depicted by the small red triangle. There is a thermal energy associated with this let-through current by the 600A fuse (red triangle). The upper diagram represents how the 1200A fuse would respond to this same fault if the 600A fuse were not in the circuit below. The larger red triangle represents the current that flows to melt the 1200A fuse. The white triangle to the right bounded by the red dotted line on the right is the clearing process for the 1200A fuse. When the 600A fuse is in the circuit being feed by the 1200A fuse, the 600A fuse must clear (the small red triangle in the lower diagram) before the 1200A fuse melts (the red triangle in the upper diagram).
Simple physics.
600A Fuse
Clearing
AVAILABLE SHORT-CIRCUIT CURRENT Tc
1200A fuse melting energy
must be greater than
600A fuse clearing energy

17. Selective Coordination
(SPD p112)
Load Side Fuse
Line Side Fuse
At Bussmann, we have made that easy because we have reviewed all of our testing data and placed fuse ratios into a table. This is our selective coordination ratio table. All you have to do is verify the ratio between the upstream and downstream device in order to obtain coordination. With the yellow labeled Low-Peak® fuses, the ratio is 2:1, all the way through the line. There is no need to plot all of the curves. Just verify the ratio. If you have a 100 amp Low-Peak® fuse, all you need to do is make sure that the upstream Low-Peak® fuse is at least 200 amps, and you are coordinated. (The selectivity ratios may not be valid when the two ampere ratings being analyzed are in the same ampere rating case size such as 30 A and 15 A fuses.) Valid up to 200ka or fuse interrupting rating, whichever is lower.
LOW-PEAK® : LOW-PEAK®
2:1 Line:Load Ratio
No plotting required!

18. Fuse Selectivity Ratio Example 1
Circuit Path Selectively
Coordinated
Loadside Fuse
Low-Peak®
KRP-C-800SP
KRP-C_SP
LPJ_SP
2:1 -
KRP-C_SP
LPJ_SP
2:1 -
Lineside Fuse
Low-Peak
LPJ-400SP
Low-Peak
LPJ-100SP
800/400 = 2:1 only 2:1 needed
Selective Coordination achieved
Analysis the 400A and 800A fuse using the ratio table and actual fuse amp ratings
The minimum ratio from the selectivity Ratio Guide is 2:1 and the actual ratio is also 2:1. Therefore, selective coordination is achieved.
400/100= 4:1 only 2:1 needed
Selective Coordination achieved between these two fuses
Overloads or faults of any level up to
200,000A

19. CCPB disconnect with CUBEFuse
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
But what do you do for branch panelboard applications, such as lighting? In the past there were only CB branch panelboards. Now Cooper Bussmann has an new panelboard.
Low-Peak CUBEFuse
TCF20RN
Branch circuits:
CCPB disconnect with CUBEFuse

20. 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
Stress the ease and simplicity

21. Selective Coordination Cooper Bussmann Fuses
Recommend design:
TCF(amp)RN CUBEFuse® to 60A (Branch Panel)
LPJ(amp)SP Class J to 600A
LPS-RK(amp)SP Class RK to 600A
LPN-RK(amp)SP
KRP-C(amp)SP Class L to 6000A
The fuses suggested
CUBEFuse
TCF(amp)RN
LPJ(amp)SP
KRP-C(amp)SP
LPS-RK(amp)SP

22. Quik-Spec™ Product Family

23. The New Standard in Fusible Panelboards
Simplifies Selective Coordination
Better Value
Smaller Footprint
Additional Main Options
Patented Fuse Rejection, Interlock and Indication
The new fusible panelboard

24. Quik-Spec™ Coordination Panelboard Callouts
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
Single “QSCP” Part Number
18, 30 & 42 Branch Circuit Positions w/ Space Options Available
Finger-safe CUBEFuse® CCPB for Branch Circuit Protection
Up to 60A Branch Circuits & 1-, 2-, 3-pole options
Cover the key attributes of the panelboard. Remember the Product Profile and Datasheet are resources.
Removable Branch Knockouts
Spare Fuse Holder w/ Spare Fuses Included w/ Each Panel
Advance Shipment of Cans Available
20”

25. 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
Cover the key attributes of the CCPB and CUBEFuse. This is the key component of this innovative panelboard.
Safety & Convenience in a Small Footprint

26. 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)
Another QS Family product: Power Module for elevator disconnect applications. NEC requires selective coordination when multiple elevators are fed by a feeder.
Power Module Panel
(PMP)

27. Quik-Spec™ Safety Switch
600V heavy-duty safety switch
Available in 30, 60, or 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
Another QS Family product

28. Resources Quik-Spec Products Low-Peak® fuse datasheets
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
Some of the resources.

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30. Selecting Protective Devices Handbook (SPD)
This comprehensive guide to electrical overcurrent protection and electrical design considerations is based on the 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

31. Quik-Spec™ Product Family
Questions??