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

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Presentation on theme: "Notes Total of 28 slides Aids to assist in developing your presentation: SPD08 Selective Coordination Section p108-146, Quik-Spec Family Brochure, QSCP."— Presentation transcript:

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.

29 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 [ ] • 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. • Extensive 55,000+ component database. • Search by partial part number or device rating. • 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 address. Details will be ed to you within 7 to 10 business days.

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

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