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:
1NotesTotal of 28 slidesAids to assist in developing your presentation: SPD08 Selective Coordination Section p , Quik-Spec Family Brochure, QSCP App Note, Product Profiles, and Datasheets
2Selective Coordination Productivity Through Protection Seminar SeriesThere 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
3Agenda Selective Coordination What is selective coordination Mandatory RequirementsWhy mandatoryHow to comply with fusesBenefits of fusible systemCooper Bussmann solutionsResources
4What is Selective Coordination For the full range of possible overcurrentsLINE SIDELOAD SIDEKRP-C-1200SPLPS-RK-600SPOnly closest upstream overcurrent protective device from overcurrent opensOther upstream (larger) overcurrent protective devices do not openSimply explanation of selective coordinationFor the full range of overcurrentsFor any overcurrent, only closest overcurrent protective device OCPD opensFaultOnly this fuse opens
5Selective Coordination (NEC®) Article 100 DefinitionArticle 700 Emergency SystemsCoordination (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 sectionis same requirement for Legally Required Systemsis requirement for Critical Operations Power Systems (COPS). The requirements is the same except there are no exceptions.
6Selective Coordination System Prospective Without Selective Coordination With Selective CoordinationLoads Unnecessarily Blacked Out No Unnecessary Load BlackoutsOPENSExplain 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.NOTAFFECTEDOpensFaultFaultNot AffectedUnnecessary Power Loss
7Lack of Selective Coordination Many people mistakenly assume that a lower ampere rated fuse will always open before a larger ampere rated fuseIf 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.
8Lack of Selective Coordination 0.010.13020080030AX800A200AMany people mistakenly assume that a lower ampere rated circuit breaker will always open before a larger ampere rated circuit breakerWhere the circuit breakers cross, it is interpreted to not be selectively coordinated SeeA 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.
9Selective Coordination System To achieve selective coordination for electrical systems requires engineering analysis and proper overcurrent protective device selectionFor most electrical systems, selective coordination is a desirable design considerationFor some electrical systems, selective coordination is mandatory (limited number of building types and then usually only few circuits)With Selective Coordination No Unnecessary Load BlackoutsOPENSIt 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.NOTAFFECTEDFault
10Summary of Requirements: Selective Coordination Selective Coordination requirements100 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.
11Selective Coordination Requirements Why?Increases system reliability to deliver powerFocus on the load!Availability of power to vital loads as long as possibleLife SafetyPublic safety and national security (COPS)Increases system reliability to power vital loads even during emergencies and disastersFacilitates restoration of power to affected loadsSelective 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.”FaultOPENSNOT AFFECTED
12Selective Coordination Includes the Entire Circuit Path, Thru Both Sources AlternateSourceNormalSourceFrom a vital load to the alternate source, the OCPDs shall be selectively coordinatedNEATSWhen alternate source is powering the vital loads, the OCPDs for the entire path from branch circuit to alternate source must be selectively coordinated.Panel
13This wording is inclusive of the the normal source path OCPDs Selective Coordination Includes the Entire Circuit Path, Thru Both SourcesAlternateSourceFrom a vital load to the alternate source, the OCPDs shall be selectively coordinatedFor a vital load to the normal source main, the OCPDs shall be selectively coordinatedNormalSourceNEATS“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 OCPDsWhen 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
14Selective 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 egressPurpose of this requirement?Maximize continuity of serviceQuicker restoration of powerRequired since 1993, the purpose is to avoid stranding passengers on elevators.
15How to Selectively Coordinate with Fuses? Let’s take a look at what it takes to selectively coordinate fuses
16Selective Coordination- Fuses LINE SIDELOAD SIDEKRP-C-1200SPLPS-RK-600SPTmTc1200A FuseMeltingThe 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 FuseClearingAVAILABLE SHORT-CIRCUIT CURRENTTc1200A fuse melting energymust be greater than600A fuse clearing energy
17Selective Coordination (SPD p112)Load Side FuseLine Side FuseAt 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 RatioNo plotting required!
18Fuse Selectivity Ratio Example 1 Circuit Path SelectivelyCoordinatedLoadside FuseLow-Peak®KRP-C-800SPKRP-C_SPLPJ_SP2:1-KRP-C_SPLPJ_SP2:1-Lineside FuseLow-PeakLPJ-400SPLow-PeakLPJ-100SP800/400 = 2:1 only 2:1 neededSelective Coordination achievedAnalysis the 400A and 800A fuse using the ratio table and actual fuse amp ratingsThe 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 neededSelective Coordination achieved between these two fusesOverloads or faults of any level up to200,000A
19CCPB disconnect with CUBEFuse Fuse Selectivity Ratio Example 2What about branch panelboard applications, such as lighting?Use the Quik-Spec™ Coordination PanelboardLow-PeakKRP-C-800SPLow-PeakLPJ-200SPBut 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 CUBEFuseTCF20RNBranch circuits:CCPB disconnect with CUBEFuse
20Benefits of Fuse Selective Coordination It is simple with Cooper Bussmann fusesJust follow the fuse selectivity ratios: 2:1 for Low-Peak® FusesNo 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 ratiosIn addition:High interrupting ratingExcellent current-limitationExcellent protection of componentsArc flash mitigationStress the ease and simplicity
21Selective Coordination Cooper Bussmann Fuses Recommend design:TCF(amp)RN CUBEFuse® to 60A (Branch Panel)LPJ(amp)SP Class J to 600ALPS-RK(amp)SP Class RK to 600ALPN-RK(amp)SPKRP-C(amp)SP Class L to 6000AThe fuses suggestedCUBEFuseTCF(amp)RNLPJ(amp)SPKRP-C(amp)SPLPS-RK(amp)SP
23The New Standard in Fusible Panelboards Simplifies Selective CoordinationBetter ValueSmaller FootprintAdditional Main OptionsPatented Fuse Rejection, Interlock and IndicationThe new fusible panelboard
24Quik-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 & 3RSurface and flush mountTop and bottom feedDoor-in-door options20” width x 50” to 60½” height x 5 ¾” depthSingle “QSCP” Part Number18, 30 & 42 Branch Circuit Positions w/ Space Options AvailableFinger-safe CUBEFuse® CCPB for Branch Circuit ProtectionUp to 60A Branch Circuits & 1-, 2-, 3-pole optionsCover the key attributes of the panelboard. Remember the Product Profile and Datasheet are resources.Removable Branch KnockoutsSpare Fuse Holder w/ Spare Fuses Included w/ Each PanelAdvance Shipment of Cans Available20”
25CUBEFuse® 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 & 60AInterlock prevents fuse removal while energizedBolt-in design for quick installation to busLocal open fuse indication on CCPB baseLockout/Tagout provisionsLock-On provisionsLow-Peak® CUBEFuse® BenefitsIP20 finger-safeSmallest footprint of any power class fuse on the marketMeets Class J time-delay electrical performance for UL/CSA600Vac voltage ratingUL Listed 300kA interrupting ratingUp to 200kA assembly SCCR ratingReduces arc-flash hazards and minimizes damage to equipment and circuits when sized properlyOptional easyID™ open fuse indicationCover the key attributes of the CCPB and CUBEFuse. This is the key component of this innovative panelboard.Safety & Convenience in a Small Footprint
26Quik-Spec™ Power Module Fused Elevator Shunt-Trip DisconnectEasy to Specify and InstallUL 98 or 67 Listed AssemblySimplifies Selective CoordinationPMP Available for multiple elevator installationsAll-in-one PackageInterfaces with Fire Safety SystemsConsistent Component Wiring EVERY TIMESaves Time for Contractor, Engineer, & InspectorMeets all codes & standards requirementsNEC®, ANSI/ASME, NFPA72Power 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)
27Quik-Spec™ Safety Switch 600V heavy-duty safety switchAvailable in 30, 60, or 200kAWith current-limiting Class J CUBEFuse, provides industry best performance against downstream arc-flash hazardsProvides extra measures of safety from contact with live partsVisible double-break quick-make quick-break rotary bladeTakes workplace safety to the next levelAnother QS Family product
28Resources Quik-Spec Products Low-Peak® fuse datasheets Product profilesData sheetsApplication Notes for QS Coordination PanelFlash DemoLow-Peak® fuse datasheetsSelective coordination technical discussion (SPD)How toSelectivity Ratio GuideSPD selective coordination section downloadVoiceover PowerPoint: Why Selective CoordinationThird party articles on Selective CoordinationSome of the resources.
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30Selecting 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 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 ChartsVisit