Power distribution and terminal blocks 9 Contents Section Description page Selecting power distribution blocks 2 Maximize short-circuit Power distribution blocks current rating up to 200 kA PDBFS UL Listed finger-safe, high SCCR blocks 3-5 PDB UL Listed high SCCR open blocks 6-8 160, 162, 163, 164 and 165 UL Recognized open blocks 9-12 Power stud terminal blocks 162, 163 and 165 UL Recognized blocks 13-14 Power splicer blocks 160, 162, 163 and 165 UL Recognized blocks 15-16 Power terminal blocks 11675 250 V screw/quick-connect block 17 11725 600 V screw/quick-connect block Barrier and deadfront terminal blocks 14002 600 V barrier block 17 14004 600 V dead front block Simplify your panel design with Bussmann series finger-safe power distribution fuse blocks To save panel space and reduce component count, Bussmann series power distribution fuse blocks combine circuit protection and power distribution into one unit. Available in Class H(K), and R up to 60 amps and Class J up to 400 amps with up to a high 200 kA withstand rating. See these cost and space saving products in Section 8, Fuse blocks and holders. BUSSMANN SERIES FULL LINE CATALOG 1007 JUNE 2017 9-1 Eaton.com/bussmannseries Power distribution and terminal blocks9 Power distribution and terminal blocks Selecting SCCR power distribution blocks and terminal blocks Short-circuit current rated power distribution blocks Bussmann series power distribution blocks have three distinct Power distribution and terminal blocks not marked with a component styles to match different application needs. There are the PDBFS SCCR are typically one of the weakest links in a control panel s and PDB high short-circuit current rated power distribution blocks equipment SCCR and may limit the equipment SCCR to no more and the 16 power terminal blocks. The differences are whether the than 10 kA. The PDBFS and PDB products have the increased power distribution blocks are enclosed or not, and whether they are spacing required for use in feeder circuits of equipment listed to UL 1953 Listed power distribution blocks or UL 1059 Recognized UL 508A (UL 1059 terminal blocks must be evaluated for proper power terminal blocks, which have different minimum spacing spacings). Also, for building wiring systems, the PDBFS and requirements. The table on this page will assist you in selecting PDB power distribution blocks can be used to meet the 2014 NEC which block is right for your application. requirements in section 376.56(B) for power distribution blocks in wireways. Why these are important Selection table Per the NEC and OSHA, equipment cannot be installed in an electrical system at a location where the available fault (short-circuit) The table below provides an overview of the three Bussmann current is greater than the equipment s SCCR. series power distribution and terminal blocks mentioned above. For details on the PDB blocks, see data sheet number 10537. For the Further, equipment SCCRs are required in the 2014 NEC and for UL 16 blocks, see data sheet numbers 10533 (UL Recognized power 508A Listed control panels. Marking the equipment SCCR on control distribution blocks), 10534 (splicer blocks) and 10535 (stud blocks). panels (NEC 409.110), industrial machinery electrical panels (NEC 670.3(A)), and HVAC equipment (NEC 440.4(B)) is required by the NEC. Wireways NEC Catalog High Spacing ** 1 UL 508A panel UL 508A panel HVAC UL 376.56(B) (requires symbol UL status Enclosed SCCR* air, 2 surface branch circuit feeder circuit 1995 UL 1953) UL 1953 Listed power PDBFS Yes*** Yes Yes Yes Yes Yes Yes distribution blocks UL 1953 Listed power Yes, with optional PDB No Yes Yes Yes Yes Yes distribution cover blocks UL 1059 Recognized 16 No Yes No Yes No Yes No terminal blocks * When protected by proper fuse class with maximum ampere rating specified or smaller. ** For details, see PDB and TB minimum spacing requirements for equipment table below. *** IP20 finger-safe under specific conditions, see data sheet 10536. Optional covers are available. Not IP20, but provide a safety benefit. No, except if single pole units installed with proper spacings. Power distribution and terminal block minimum spacing requirements for equipment Spacing between live parts of opposite polarity Spacing between live parts and grounded parts or enclosure UL standard Through air 600 V Over surface 600 V 600 V 508A feeder circuits 1 2 1 508A branch circuits 3/8 1/2 1/2 1995 HVAC 3/8 1/2 1/2 Note: Refer to specific UL standards for complete spacing details. 9-2 BUSSMANN SERIES FULL LINE CATALOG 1007 JUNE 2017 Eaton.com/bussmannseries