FEDERAL PIONEER 4th Edition, January 2000
TABLE OF CONTENTS 1. Introduction... 4 2. Federal Pioneer Series Ratings... 5 3. Series Rated Panelboard Labels... 6 4. Series Rating Application... 7 5. Series Rating Example... 8 6. Series Rating Tables Stab-lok Loadcentres...10 Meter Centres...11 NBC/NBLP...12 NBDP...13 NHC...14 NHDP...15 CDP...16
Introduction CSA requires that all CSA listed panelboards and switchboards are marked with a maximum short circuit current rating. This rating represents the maximum fault current, which the bus structure and overcurrent devices can withstand during a bolted fault situation. There are two systems of short circuit current protection available: A fully rated system, or A series rated system In a Fully Rated System, the interrupting rating of all devices matches or exceeds the system available fault level at every point in the distribution system. The main advantage of this type of system is that it provides the most robust form of protection and its application is straightforward. The only disadvantage is that it is the more expensive of the two alternatives. The alternative is to use a Series Rated System. This type of system permits the use of downstream devices having lower interrupting ratings than the available fault current when protected by specific upstream devices. The upstream device must have an interrupting rating equal to or greater than the available fault current. In addition, each specific combination of upstream and downstream devices must be tested and approved by CSA at the fault level in question. The principal advantage of this type of system is that it can lower the overall equipment cost. The main disadvantage is that its application can be confusing for the specifying engineer, the installer, and the end-user with a higher probability of error than in the fully rated system. Note that there is no difference with regard to circuit protection and continuity when comparing series rated and fully rated systems. Although the upstream and downstream devices have different interrupting ratings, they both have the same time-current trip characteristic. Whether the downstream device is fully rated or series rated, coordination and selectivity remain the same. 4
Federal Pioneer Series Ratings Series ratings work on the principle of adding impedance into the faulted circuit. In a major fault situation, both the upstream and the downstream devices will open. The simultaneous opening of both devices introduces impedance into the circuit, which reduces the let-through energy to a value that can be safely cleared. It is this added impedance that allows a lower rated device to be safely used in situations where a higher fault current is available. However, the let-through energy cannot be accurately calculated by theory. Therefore, the manufacturer must specifically test each combination. A CSA representative must witness each of these tests and each safe combination must be clearly identified on the end use, downstream equipment to help prevent misapplication of an added device later on by the end user. Series ratings with Federal Pioneer equipment include Horizon molded case circuit breakers, fuses (R, J, and T), as well as NA/NB/NC type circuit breakers. Series rating applications are generally only used for 600A and lower feeder levels. It cannot be over emphasized that great care must be taken by the designer, the installer, the inspector, and later on by the end user to confirm that the correct devices have been chosen to ensure the equipment can safely withstand a bolted fault situation. 5
Series Rated Panelboard Labels Downstream panelboards installed with branch circuit breakers that are used in series rating applications must be clearly labeled to indicate the following: panelboard type operating voltage available fault level fully rated integral main or upstream device type approved lower rated branch breaker type Replacement of breakers in series rated panelboards must be based on breakers listed on the panelboard series rating label. These specific breaker combinations are based on approved test results. Careful attention must be given to these labels. SHORT CIRCUIT INTERRUPTION RATINGS CAPACITE D INTERRUPTION EN COURT-CIRCUIT Max. ka (Sym.) Branch Breakers Dis. de Derivation Upstream Device Protection en Amont 100 NB, NBGF R 100A max. fuse 100 NB, NBGF J,T 200A max. fuse 22 NB, NBGF NBH Breaker 25 NB, NBGF FKD Breaker 65 NB, NBGF FKG Breaker 65 NB, NBGF CE-E Breaker 100 NB, NBGF CE-N Breaker 200 NB, NBGF CJL-H Breaker IF NONE OF THE ABOVE RATINGS APPLY: This Panelboard is suitable for use on a circuit capable of delivering not more than 22kA RMS symmetrical, 240V maximum or the interrupting capacity of the lowest rated device installed, whichever is less. SI AUCUN DES CLASSEMENTS CI DESSUS NE S APPLIQUE PAS: Ce Panneau convient aux circuits capables de fournir pas plus de 22kA EFF, symétriques à maximum de 240V ou de la valeur du courant coupure de dispositif le plus faible installé, selon la valeur la plus faible des deux. Sample Label for NBLP Panelboard 6
Series Rating Application The following steps are used to correctly choose the appropriate series rating combination: Step 1: Gather the appropriate information System operating voltage: Fault current available: Amperage of upstream device: Amperage of downstream devices: Step 2: Determine the type of downstream panelboard Step 3: Based on the system operating voltage and branch amperages required, pick one of the following Federal Pioneer products: Stab-lok pg. 10 Meter Centre pg. 11 NBC pg. 12 NBLP pg. 12 NBDP pg. 13 NHC pg. 14 NHDP pg. 15 CDP pg. 16 a) Go to the appropriate table on the page given in Step 2 above. b) Using the Voltage and Max. Fault Level columns, find the rows that equal the system voltage and have a fault level greater than or equal to the available fault current as determined in Step 1. c) Locate the Upstream Fuse column amperage. d) Proceed vertically down to find the intersection with the Fault Available row to determine appropriate upstream fuse. e) Note that only the branch breakers listed in the Branch Breakers column in the intersecting row are acceptable for series rating. 7
Series Rating Example The figure below shows a typical application of series ratings. In this case a type 60-100 switchboard is located quite close to a transformer and there is a very large available fault current (65kA). The best solution here is to use QMQB fusible switches in the switchboard which have an I.C. rating of 200 ka. However, a 200A lighting panelboard with circuit breakers is required downstream. Using breakers with an interrupting capacity of 65kA @ 600V would be very expensive and would require substantially more wall space. In this case we will use series ratings with a NHDP panelboard to lower the cost and space requirements. 8
Series Rating Example (con t) Using the worksheet provided, Step 1: Gather the appropriate information System operating voltage: 347/600V Fault current available: 65,000A Amperage of upstream device: _200A Amperage of downstream devices: 15-30A, 1P; 15-150A, 2P, 3P Step 2: Determine the type of downstream panelboard Step 3: Since we are looking for a 200A, 600V lighting panelboard, the NHDP panelboard makes the most sense. Loadcentre pg. 10 Meter Centre pg. 11 NBC pg. 12 NBLP pg. 12 NBDP pg. 13 NHC pg. 14 NHDP pg. 15 CDP pg. 16 a) Go to the table on the top of page 14 (refer to figure 2 below). b) We find the horizontal row by locating 600V and 100kA (which is the next highest value than the required 65kA). c) We find the vertical column by locating 200A as the upstream fuse amperage. d) By cross referencing the column and the row, we find that either a 200A type J or type T fuse is acceptable in the QMQB upstream. e) The intersecting row also tells us that any of the CE-B or CE-E type circuit breakers are acceptable in combination with this fuse. NHDP, 600Vac, Lighting Panelboard Voltage Max. Fault Level Branch Integral Main or Upstream Fuse Type Available (ka Sym.) Breakers 150A 200A 400A 600A 120/240 and 240V 100 CE-E4, CE-B, CE-E J, T J, T (1) J, T (1) 480V 100 CE-E4, CE-B, CE-E J, T J, T (1) J, T(1) 600V 100 CE-B, CE-E J, T (1) n/a n/a Notes: 1. Branch breakers : 2 and 3 pole only. FIGURE 2 - Table from page 12. 9
Stab-lok 240Vac, Loadcentre Max. Fault Level Branch Poles/ Upstream Fuse Type Available (ka Sym.) Breakers Amps 100A 200A 100 NA, NAGF 1P 15-50A R, J, T J, T Max. Fault Level Branch Poles/ Upstream Fuse Type Available (ka Sym.) Breakers Amps 400A 100 NA, NAGF 1P 15-50A T (1) 1P 15-50A NAH Notes: 1. Bussman type JJN only. Max. Fault Level Branch Poles/ Integral Main or Upstream Breaker Type Available (ka Sym.) Breakers Amps 125A 200A 225A 400A 1C (60-125A) 2C, FKD FKD CJL-E 22 NA, NAGF 1P 15-50A NAH, NBH 25 1P 15-50A FKD, CE-E FKD FKD CJL-E NA, NAGF 65 1P 15-50A FKG, CE-E FKG FKG CJL-E NA, NAGF 100 1P 15-50A CE-N CJL-H CJL-H CJL-H NA, NAGF 2P 15-100A 200 1P 15-50A n/a CJL-H CJL-H CJL-H NA, NAGF 10
240Vac, Multi-level Ratings (Meter Centre/Distribution Panels) Max. Fault Level Sub-Service Branch Poles/ Upstream Fuse Type Available (ka Sym.) Breakers Breakers Amps 200A 400A 600A 800A 1C (50-125A) 22 NBH, FKD NA, NAGF NB, NBGF 1P 15-50A 1C (50-125A) 65 NBH, FKD NA, NAGFNB, NBGF 1P 15-50A 1C (50-125A) 100 NBH, FKD NA, NAGF NB, NBGF Notes: Bussman and Gould Type T Fuses. 1P 15-50A J, T J, T J, T T (1) J, T J, T J, T T (1) J, T J, T J, T T (1) Max. Fault Level Sub-Service Branch Poles/ Integral Main or Upstream Breaker Type Available (ka Sym.) Breakers Breaker Amps 200A 400A 600A 1C (60-125A) 22 NBH, FKD NA, NAGFNB, 1P 15-50A FKD (1) CJL-E CJM-E NBGF 1C (60-125A) 25 NBH, FKD NA, NAGFNB, NBGF 1P 15-50A 1C (60-125A) 42 NBH, FKD NA, NAGFNB, NBGF 1P 15-50A 1C (60-125A) 65 NBH, FKD NA, NAGF 1P 15-50A NB, NBGF Notes: 1. FKD/FKG to NBH/1C (60-125A) to Branch only FKD (1) CJL-E CJM-E FKG (1) CJL-E CJM-E FKG (1) CJL-E n/a Safety Switch Class J Fuse 100 ka @ 240V Safety Switch ClassJFuse 100 ka @ 240V 100A M 100A M 100A M 100A M 100A M 100A M NB Sub-Service Breakers, 10 ka @240V Meter Centre Example To suite panels NA, NC Branch Breakers, 10 ka @240V NB Branch 10 ka @ 240V NBDP NA/NB/NC Branch 10 ka @ 240V Stab-lok/NBLP Distribution Panels 11
NBC/NBLP, 240Vac, Lighting Panelboard Max. Fault Level Branch Poles/ Upstream Fuse Type Available (ka Sym.) Breakers Amps 100A 150A 200A 1P 15-50A 100 NB, NBGF R, J, T J, T J, T Max. Fault Level Branch Poles/ Integral Main or Upstream Breaker Type Available (ka Sym.) Breakers Amps 150A Max. 225A Max. 22 NB, NBGF 1P 15-50A NBH FKD 25 NB, NBGF 1P 15-50A FKD, CE-E FKD 65 1P 15-50A NB, NBGF FKG, CE-E FKG 100 NB, NBGF 1P 15-50A CJL-H 2P 15-100A CE-N 200 NB, NBGF 1P 15-50A CJL-H CJL-H ClassJFuse 100 ka @ 240V NB Branch 10 ka @ 240V NB Branch 10 ka @ 240V FKG Main 65 ka @ 240V NBC/NBLP Examples 12
NBDP, 240Vac, Lighting Panelboard Max. Fault Level Branch Poles/ Upstream Fuse Type Available (ka Sym.) Breakers Amps 400A 600A NB, NBGF 1P 15-50A 100 NBH 1P 15-50A T (1) T (1) Notes: 1. Bussman type JJN only. Max. Fault Level Branch Poles/ Integral Main or Upstream Breaker Type Available (ka Sym.) Breakers Amps 400A Max. 600A Max. 42 1P 15-50A CJL-E CJM-E NB, NBGF 65 NB, NBGF 1P 15-50A CJL-E CJM-H 100 NB, NBGF 1P 15-50A CJL-H CJM-H 200 NB, NBGF 1P 15-50A CJL-H CJM-H Type JJN Fuse 100 ka @ 240V NBH Branch 22 ka @ 240V NB Branch 10 ka @ 240V CJL-E Main 65 ka @ 240V NBDP Examples 13
NHC, 600Y/347Vac, Lighting Panelboard Voltage Max. Fault Level Branch Upstream Fuse Type Available (ka Sym.) Breakers 100A 150A 200A 120/208V and 100 NH R, J, T R, J, T R, J, T 240V 200 NH R, J, T J,T J, T 480Y/277V 100 NH R, J, T R, J, T R, J, T 200 NH R, J, T J, T J, T 600Y/347V 100 NH J J J Voltage Max. Fault Level Branch Integral or Upstream Breaker Type Available (ka Sym.) Breakers 100A 150A 225A 120/208V 200 NH CE-H CE-H n/a and 240V 480Y/277V 25 NH CE-E, CE-N CE-E, CE-N n/a 65 NH CE-N CE-N n/a 100 NH CE-H CE-H n/a 200 NH CE-B+LFD (1) CE-B+LFD (1) n/a 600Y/347V 14 NH CE-B, CE-E, CE-N CE-B, CE-E, CE-N CJL-E, CJL-N 18 NH CE-E, CE-N CE-E, CE-N CJL-E, CJL-N 25 NH CE-N CE-N n/a 50 NH CE-B+LFD (1) CE-B+LFD (1) n/a Notes: 1. CE-B+LFD is a CE-B breaker plus LFD3150 limiter 200A QMQB w/ Jfuse 100 ka @600V NH Branch 10kA@600Y/347V NHC Example 14
NHDP, 600Vac, Lighting Panelboard Voltage Max. Fault Level Branch Upstream Fuse Type Available (ka Sym.) Breakers 150A 200A 400A 600A 120/240 and 100 CE-E4, CE-B, CE-E J, T J, T J, T (1) J, T (1) 240V 480V 100 CE-E4, CE-B, CE-E J, T J,T J, T (1) J, T (1) 600V 100 CE-B, CE-E J, T (1) J, T (1) n/a n/a Notes: 1. Branch breakers : 2 and 3 pole only. Voltage Max. Fault Level Branch Integral Main (1) or Upstream Breaker Type Available (ka Sym.) Breakers 150A 225A 400A 600A (4) 22 CE-E4, CE-B CE-E CJL-E CJL-E CJM-N 120/240V 42 CE-E4, CE-B, CE-E CE-E CJL-E CJL-E CJM-N and 240V 65 CE-E4, CE-B, CE-E CE-E CJL-E CJL-E CJM-N 100 CE-E4, CE-B, CE-E CE-N CJL-N CJL-N CJM-N 200 CE-E4, CE-B, CE-E CE-H CJL-H CJL-H n/a 25 CE-E4, CE-B CE-E CJL-E CJL-E CJM-E 480V 35 CE-E4, CE-B, CE-E CE-N CJL-E CJL-E CJM-E 65 CE-E4, CE-B, CE-E CE-N CJL-N CJL-N CJM-N 100 CE-E4, CE-B, CE-E CE-H CJL-H CJL-H n/a 18 CE-B CE-E CJL-E CJL-E CJM-E 25 CE-B, CE-E CE-N CJL-E CJL-E CJM-E 600V 35 CE-B, CE-E CE-H CJL-N CJL-N CJM-N 42 CE-B, CE-E CE-B+LFD (2) CJL-H CJL-H n/a 65 CE-B, CE-E CE-B+LFD (2) TH4+P08 (3) n/a n/a 100 CE-B, CE-E CE-B+LFD (2) TH4+P08 (3) n/a n/a Notes: 1. Integral main limited to 400A and 65 ka max. @240V, 25 ka max. @480V, and 25 ka max. @600V. 2. CE-B+LFD is a CE-B breaker plus LFD3150 limiter. 3. TH4+P08 is a TH4 breaker with 200A P08 limiters. 4. Branch breakers : 2 and 3 pole only. 200A QMQB w/ J fuse 100 ka @600V CE-B Branch 14 ka @ 600V NHDP Example 15
CDP, 600Vac, Power Panelboard Voltage Max. Fault Level Branch Upstream Fuse Type Available (ka Sym.) Breakers 400A (1) 600A (1) 120/240V and 100 CE-E4, CE-B, CE-E J, T J, T CJL-E R n/a 480V 100 CE-E4, CE-B, CE-E, CJL-E, CJM-E J, T T CE-E4, CE-B, CE-E, CJL-E, CJM-E n/a J 200 CJL-E J, T n/a CJL-E R n/a 600V 100 CJL-E, CJM-E J, T n/a Notes: 1. Branch breakers: 2 and 3 pole only. CJL-E, CJM-E n/a J, T 200 CJL-E J, T n/a Max. Fault Level Branch Integral Main or Upstream Voltage Available Breakers Breaker Type (ka Sym.) 400A 600A (1) 120/240V and 65 CE-E4, CE-B, CE-E CJL-E CJM-N 240V 100 CE-E4, CE-B, CE-E, CJL-E, CJM-E CJL-N CJM-N 200 CE-E4, CE-B, CE-E, CJL-E CJL-H n/a 35 CE-E4, CE-B, CE-E CJL-E CJM-E 480V 65 CE-E4, CE-B, CE-E, CJL-E, CJM-E CJL-N CJM-N 100 CE-E4, CE-B, CE-E, CJL-E CJL-H n/a 25 CE-B, CE-E CJL-E CJM-E 600V 35 CE-B, CE-E, CJL-E, CJM-E CJL-N CJM-N Notes: 1. Branch breakers: 2 and 3 pole only. 42 CE-B, CE-E, CJL-E CJL-H n/a Main Section Distribution Section 400A QMQB w/ J fuse 100 ka @600V CF-E Branch 18 ka @ 600V CJL-E Branch 25 ka @ 600V CDP Example 16
Schneider Canada Inc. 19 Waterman Avenue Toronto, Ontario, M4B 1Y2 www.schneider-electric.ca Tel.: (416) 752-8020 Fax: (416) 752-6230 F1100AB9901EP R1 2000 Schneider Canada, All Rights Reserved January, 2000