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table of contents page selection table . ........................... 2 power distribution blocks pdbfs series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-8 pdb series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-12 terminal blocks 16xxx series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13-15 14002-3-ul, tb300-03sp-ul, ndn63-wh-ul, ndn111-wh-ul . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16-18 application notes . . . . . . . . . . . . . . . . . . . . . . . . 19-23 tools to assist panel layout 2d and 3d cad files for some products to facilitate panel layouts found at www.cooperbussmann.com engineering services for sccr oscar? compliance software eliminates the guesswork in assembly short-circuit current rating (sccr) calculations. the cooper bussmann innovative oscar? compliance software assists customer compliance with new code and standards requirements for short-circuit current ratings as they relate to industrial control panels, equipment and assemblies. go to www.cooperbussmann.com sccr panel design review for improving your assembly sccr. if your sccr needs improvement, contact the cooper bussmann team for a design review. we guarantee our panel sccr review service for ul508a supplement sb pre-certifica- tion. other application information on sccr publications: ? advanced guide to understanding assembly short-circuit current rating ? simplified guide to understanding short-circuit current rating C find it, fix it, forget it ? spd (selecting protective devices) sections on industrial control panels and also conductor & terminations. technical assistance application engineering application engineering assistance is available to customers. the application engineering team is staffed by engineers and available by phone with technical and application support monday C friday, 8:00 a.m. C 5:00 p.m. central time. application engineering can be reached via phone, fax or email: ? phone: 636-527-1270 ? fax: 636-527-1607 ? e-mail: fusetech@cooperbussmann.com online resources visit www .cooperbussmann.com for the following resources: ? arc-flash calculator ? oscar? compliance software ? training modules services ? engineering ? training ? testing contact us for more information on services: ? phone: 636-207-3294 ? e-mail: services@cooperbussmann.com power distribution blocks & terminal blocks with high short-circuit current ratings 1011 sb-bu09622 page 1 of 23 data sheet 1049
short-circuit current rated power distribution blocks cooper bussmann offers three distinctly different styles of short-circuit current rated power distribution blocks (pdbs) and terminal blocks (tbs) to match different application needs. the differences are whether the power distribution blocks are enclosed or not, and whether they are ul1953 listed pdbs or ul1059 recognized tbs, which have different minimum spacing requirements. the table on this page can assist in the selection of the right series for your application requirements. why these are important? assembly short-circuit current ratings (sccrs) are now required in the 2005 nec ? and ul508a listed industrial control panels. marking the sccr on industrial control panels (nec ? 409.110), industrial machinery electrical panels (nec ? 670.3(a)), and hvac equipment (nec ? 440.4(b)) is now required by the national electrical code. pdbs or tbs not marked with a sccr are typically one of the weakest links and may limit an assembly to no more than 10ka sccr. the pdbfs and pdb series have increased spacing required where used in feeder circuits in equipment listed to ul508a (ul1059 tbs must be evaluated for proper spacings). also, for building wiring systems, the pdbfs series and pdb series power distribution blocks can be used to meet the new 2005 nec ? requirements in section 376.56(b) for pdbs in wireways. more application information on pages 19-23. industrial industrial control control hvac wireways product catalog high spacing** panels panels ul nec page ul enclosed sccr* 1 air ul 508a ul 508a 1995 376.56(b) 2 surface branch feeder (requires circuit circuit ul 1953) series pdbfs 3 ul 1953 listed yes ? yes yes yes yes yes yes power distribution blocks yes series pdb 9 ul 1953 listed no*** yes yes yes yes yes w/optional power distribution blocks cover series ul 1059 recognized 16xxx 13 terminal blocks no*** yes no**** yes no**** yes no ndn63-wh-ul, ndn111-wh-ul, ul 1059 recognized 14002-3-ul, 16 terminal blocks no yes no yes no yes no tb300-03sp-ul selection table ? ip-20 finger-safe under specific conditions, see datasheet page 8. *when protected by proper fuse class with maximum ampere rating specified or smaller. ** see pdb spacing requirements for equipment table below. ***optional covers are available. not ip-20, but provide a safety benefit. ****no, except: yes, if single pole units installed with proper spacings. spacing between spacing between live parts of live parts and ul standard opposite polarity grounded parts or enclosure @600v 508a feeder circuits 508a branch circuits 1995 hvac through air over surface @600v @600v 1 ? 2 ? 1 ? 3 ? 8 ? 1 ? 2 ? 1 ? 2 ? 3 ? 8 ? 1 ? 2 ? 1 ? 2 ? note: refer to specific ul standards for complete spacing details. pdb & tb minimum spacing requirements for equipment series pdbfs series pdb series 162 and 163 magnum terminal blocks selection table for sccr power distribution blocks and terminal blocks 1011 sb-bu09622 page 2 of 23 data sheet 1049
feature/benefits ? enclosed for enhanced safety; ip-20 finger-safe under specific conditions, see page 8 ? high short-circuit current ratings up to 200,000a: pdbs do not have to be a weak link in achieving a high sccr for an industrial control panel ? suitable for installation in wireways and industrial control panel feeder and branch circuits. listed to ul1953 which has minimum spacing requirements at 600v of at least 1 through air and 2 over surface ? small footprint saves panel space. stack side by side and still meet 1? and 2? spacing requirements ? for 2d and 3d cad drawings visit www.cooperbussmann.com agency/standards ? ul listed 1953, guide qpqs, file e256146 ? csa certified, class 6228-01, file 15364 ? ce component iec 60947-7-1 ? iec 60529, ip-20 (finger safe) under specific conditions, see page 8 electrical ? 600vac or dc (ul 1953), 690vac or dc (iec) ? short-circuit current ratings up to 200ka, see table below ? ampacities up to 760 amps ? 75oc rated connectors ? cu wire range 14 awg to 500 kcmil or 2.5 to 240 mm 2 mechanical ? din rail or panel mount; pdbfs330 & pdbfs504 panel mount only ? captive termination screws; screws do not get misplaced ? wire ready: captive termination screws shipped backed out to save time on conductor installation ? sliding din rail latch for easy mounting ? single pole, gang mountable for multiple pole applications with interlocking dovetail accessory (optional part 2a1279) one pin interlocks two units, two pins to interlock three units (see illustration on page 6) ? flammability, ul 94v0 ? tin-plated al connectors suitable for cu conductors ? elongated hole for panel mounting; easier mounting with greater flexibility in matching up with drilled panel holes ? din rail end anchors required to prevent damage to block when torquing, anchors not offered by cooper bussmann terminal copper conductor capability short-circuit current rating data line load configuration conductors max fuse class & amp** catalog number openings per pole line load j t rk1 rk5 (all single amps wire range wire range awg or awg or lpj jjs lps-rk frs-r sccr pole) line load kcmil kcmil jjn lpn-rk frn-r pdbfs204 175a 2/0 to 8 awg 2/0 to 8 awg 2/0 to 8 2/0 to 8 200 200 100 60 200ka 70 to 10 mm 2 70 to 10 mm 2 2/0 to 8 awg 4 to 14 awg 4 to 12 200 200 100 60 200ka PDBFS220 175a 70 to 10 mm 2 25 to 2.5 mm 2 2/0 to 8 4 to 14 175 175 100 30 100ka 200 200 100 60 50ka 350kcmil to 6 awg 350kcmil to 6 awg pdbfs303 310a 150 to 16 mm 2 150 to 16 mm 2 350 to 6 350 to 6 400 400 200 100 200ka 500kcmil to 6 awg 2 to 14 awg 2 to 6 400 400 200 100 200ka pdbfs330 380a 240 to 16 mm 2 35 to 2.5 mm 2 500 to 6 2 to 14 200 200 100 60 50ka 175 175 100 30 100ka 300kcmil to 4 awg 4 to 14 awg 300 4 to 8 600 600 400 200 200ka pdbfs377 570a 150 to 12 mm 2 25 to 2.5 mm 2 300 to 4 4 400 400 200 100 100ka 4 to 14 200 200 100 60 50ka pdbfs500 620a 350kcmil to 4 awg 350kcmil to 4 awg 350 to 4 350 to 4 600 600 400 200 200ka 185 to 12 mm 2 185 to 12 mm 2 500kcmil to 6 awg 500kcmil to 6 awg 500 500 600 800* 600 200 200ka pdbfs504 760a 240 to 16 mm 2 240 to 16 mm 2 500 to 6 500 to 6 600 600 400 200 100ka ampacities 75c per nec? table 310.16 and ul508a table 28.1 *class l 800a (krp-c 800_sp) or less fuses suitable for this particular sccr case. ** class g 60a (sc-60) or less or class cc 30a (lp-cc-30, fnq-r-30, ktk-r-30) or less are suitable for all sccrs in this table. series pdbfs electrical series pdbfs enclosed power distribution blocks 1011 sb-bu09622 page 3 of 23 data sheet 1049
dimensions in[mm] width length height item part no. a b c d e f g h 1 pdbfs204 1.030[26.16] 3.372[94.80] 2.146[54.50] 3.550[90.17] 2.905[73.79] 0.197[5.00] 0.197[5.00] n/a 2 PDBFS220 1.030[26.16] 3.372[94.80] 2.146[54.50] 3.550[90.17] 2.905[73.79] 0.197[5.00] 0.197[5.00] n/a 3 pdbfs303 1.550[39.37] 4.665[118.50] 2.874[73.00] 4.475[113.67] 3.810[96.77] 0.197[5.00] 0.236[6.00] n/a 4 pdbfs330 1.550[39.37] 4.665[118.50] 2.950[74.93] 4.475[113.67] 3.810[96.77] 0.197[5.00] 0.236[6.00] n/a 5 pdbfs377 1.875[47.62] 4.665[118.50] 2.933[74.50] 4.475[113.67] 3.810[96.77] 0.197[5.00] 0.236[6.00] n/a 6 pdbfs520 2.380[60.45] 4.665[118.50] 2.598[66.00] 4.475[113.67] 3.810[96.77] 0.197[5.00] 0.236[6.00] n/a 7 pdbfs504 2.560[65.02] 4.665[118.50] 3.150[80.00] 4.475[113.67] 3.810[96.77] 0.197[5.00] 0.236[6.00] 46.00[1.811] pdbfs330 pdbfs303 pdbfs204 PDBFS220 c series pdbfs enclosed power distribution blocks 1011 sb-bu09622 page 4 of 23 data sheet 1049
pdbfs504 pdbfs377 pdbfs500 series pdbfs enclosed power distribution blocks 1011 sb-bu09622 page 5 of 23 data sheet 1049
2a1279 accessory ordered separately. for interlocking two or more blocks on a din rail, insert male dove tail part number 2a1279 into the female dove tail opening. fully insert male dove tail to interlock blocks. din r ail mounting pdbfs204, PDBFS220, pdbfs303, pdbfs377, and pdbfs500 only. p anel mounting capable on all part numbers or din rail anchors are required on each side of block or blocks. anchors must be used to prevent damage to the plastic housing when tightening terminals. close the latch hook load side onto 35mm din rail open the latch using screwdriver use 2 screws for mounting each pole (#10 or m5 screw) (4 screws for pdbfs504) rotate pdb down series pdbfs enclosed power distribution blocks 1011 sb-bu09622 page 6 of 23 data sheet 1049
wire connector hole diameter part line number in (mm) pdbfs204 0.450 (11.5) 0.450 (11.5) PDBFS220 0.450 (11.5) 0.246 (6.25) pdbfs303 0.720 (18.3) 0.720 (18.3) pdbfs330 0.870 (22.1) 0.314 (8.0) pdbfs377 0.687 (17.5) 0.265 (6.7) pdbfs500 0.718 (18.2) 0.718 (18.2) pdbfs504 0.875 (22.2) 0.875 (22.2) line load part number torque trim length hex key cu wire range torque trim length cu wire range lb-in (nm) in (mm) lb-in (nm) in (mm) hex key pdbfs204 2/0 to 8 awg 110 (12.4) 0.850 (21.6) 3/16? 2/0 to 8 awg 110 (12.4) 0.970 (24.6) 3/16? 70 to 10mm 2 70 to 10mm 2 4 to 6 awg 25 to 16mm 2 35 (4.0) PDBFS220 2/0 to 8 awg 120 (13.6) 0.750 (19.0) 3/16? 8 awg 25 (2.8) 0.550 (14.0) top row, 1/8? 70 to 10mm 2 10mm 2 0.850 (21.6) bottom row 10 to 14 awg 20 (2.3) 6 to 2.5mm 2 pdbfs303 350 kcmil to 6 awg 275 (31.1) 1.350 (34.3) 5/16? 350 kcmil to 6 awg 275 (31.1) 1.250 (31.8) 5/16? 150 to 16mm 2 150 to 16mm 2 2 to 3 awg 50 (5.7) 35mm 2 pdbfs330 500 kcmil to 6 awg 500 (56.5) 1.250 (31.8) 3/8? 4 to 6 awg 240 to 16mm 2 25 to 16mm 2 45 (5.1) 0.590 (15.0) top row 1/8? 8 awg 40 (4.5) 1.200 (30.5) bottom row 10mm 2 10 to 14 awg 35 (4.0) 6 to 2.5mm 2 4 to 6 awg 25 to 16mm 2 35 (4.0) pdbfs377 300 kcmil to 4 awg 275 (31.1) 1.15 (29.2) top row 1/4? 8 awg 25 (2.8) 0.550 (14.0) top row, 1/8? 150 to 25mm 2 1.400 (35.6) bottom row 10mm 2 1.00 (25.4) middle row 10 to 14 awg 20 (2.3) 1.220 (31.0) bottom row 6 to 2.5mm 2 pdbfs500 350 kcmil to 4 awg 275 (31.1) 1.250 (31.8) 5/16? 350 kcmil to 4 awg 275 (31.1) 1.250 (31.8) 5/16? 185 to 25mm 2 185 to 25mm 2 pdbfs504 500 kcmil to 6 awg 500 (56.5) 1.250 (31.8) 3/8? 500 kcmil to 6 awg 500 (56.5) 1.250 (31.8) 3/8? 240 to 16mm 2 240 to 16mm 2 series pdbfs trim load in (mm) part no. minimum enclosure size pdbfs204 16? x 16? x 6.75? PDBFS220 16? x 16? x 6.75? pdbfs303 36? x 30? x 12.625? pdbfs330 24? x 20? x 6.75? pdbfs377 24? x 20? x 6.75? pdbfs500 36? x 30? x 12.625? pdbfs504 36? x 30? x 12.625? series pdbfs enclosed power distribution blocks 1011 sb-bu09622 page 7 of 23 data sheet 1049
line load ip-20 ip-20 part trim length installed wire conductor screw trim length installed wire conductor screw number in (mm) openings opening in (mm) openings opening pdbfs204 0.850 (21.6) 2/0 to 8 awg yes yes 0.970 (24.6) 2/0 to 8 awg yes yes 70 to 10mm 2 70 to 10mm 2 4 to 14 awg 2/0 to 8 awg 0.550 (14.0) 25 to 2.5mm 2 yes yes PDBFS220 0.750 (19.0) 70 to 10mm 2 yes yes top row, screws fully n/a yes 0.850 (21.6) opened bottom row no wire in hole no n/a 350 kcmil to 2/0 awg 350 kcmil to 2/0 awg 150 to 70mm 2 yes yes 1.250 (31.8) 150 to 70mm 2 yes yes pdbfs303 1.350 (34.3) 1/0 to 6 awg 1/0 to 6 awg 50 to 16mm 2 no yes 50 to16mm 2 no yes 500 to 250 kcmil 2 to 14 awg 240 to 150mm 2 yes yes 0.590 (15.0) 35 to 2.5mm 2 yes yes pdbfs330 1.250 (31.8) 4/0 to 6 awg top row, screws fully n/a yes 120 to 16mm2 no yes 1.200 (30.5) opened bottom row no wire in hole no n/a 300 kcmil to 4/0 awg 150 to 120mm 2 yes yes 0.550 (14.0) 4 to 14 awg 1.15 (29.2) top row, 3/0 to 4 awg top row, 25 to 2.5mm 2 yes yes pdbfs377 1.400 (35.6) bottom 95 to 25mm 2 no yes 1.00 (25.4) row screws fully middle row, screws fully n/a yes opened n/a no 1.220 (31.0) opened bottom row no wire in hole no wire in hole no n/a yes n/a 350 kcmil to 2/0 awg 350 kcmil to 2/0 awg 185 to 70mm 2 yes yes 185 to 70mm 2 yes yes 1/0 to 4 awg 1/0 to 4 awg pdbfs500 1.250 (31.8) 50 to 25mm 2 no yes 1.250 (31.8) 50 to 25mm 2 no yes screws fully screws fully opened n/a no opened n/a no no wire in hole no n/a no wire in hole no n/a 500 to 350 kcmil 500 to 350 kcmil 240 to 185mm 2 yes yes 240 to 185mm 2 yes yes 300 kcmil to 6 awg 300 kcmil to 6 awg pdbfs504 1.250 (31.8) 150 to 16mm 2 no yes 1.250 (31.8) 150 to 16mm 2 no yes screws fully screws fully opened n/a no opened n/a no no wire in hole no n/a no wire in hole no n/a specific conditions to achieve ip-20 finger-safe status for series pdbfs series pdbfs enclosed power distribution blocks 1011 sb-bu09622 page 8 of 23 data sheet 1049
feature/benefits ? high short-circuit current ratings up to 200ka pdbs do not have to be a weak link in achieving high sccr for an industrial control panel ? suitable for installation in wireways (with optional covers) and industrial control panel feeder and branch circuits. listed to ul1953 which has minimum spacing requirements at 600v of at least 1 through air and 2 agency/standards ? ul listed 1953, guide qpqs, file e256146 electrical ? 600vac or dc (ul 1953) ? short-circuit current ratings up to 200ka, see table ? 75oc rated connectors, ampacities up to 310a ? wire range 14 awg to 350 kcmil cu ? spacing between uninsulated opposite polarities or ground meets ul 1953 which requires at least 1 through air and 2 over surface for 301 to 600v mechanical ? panel mount ? flammability, ul 94v0 ? tin-plated al connectors suitable for cu conductors terminal copper conductor capability short-circuit current rating data line load configuration conductors max fuse class & amp** part openings per pole line load j t rk1 rk5 number amps wire range wire range awg or awg or lpj jjs lps-rk frs-r sccr line load kcmil kcmil jjn lpn-rk frn-r pdb204-1 pdb204-3 175a 2/0 to 8 awg 2/0 to 8 awg 2/0 to 8 2/0 to 8 200 200 200 60 200ka 4 to 12 200 200 200 60 200ka pdb220-1 175a 2/0 to 8 awg 4 to 14 awg 2/0 to 8 4 to 14 175 175 100 60 100ka pdb220-3 pdb280-1 175a 2/0 to 8 awg 1/4-20 x 3/4 stud 2/0 to 8 stud 200 200 100 60 200ka pdb280-3 pdb321-1 4 to 12 400 400 200 100 200ka pdb321-2 175a 2/0 to 8 awg 4 to 14 awg 2/0 to 8 pdb321-3 4 to 12 175 175 100 60 100ka pdb323-1 400 400 200 100 200ka pdb323-3 310a 350kcmil to 4 awg 4 to 12 awg 350 to 4 4 to 8 4 to 12 175 175 100 60 100ka pdb370-1 4 to 8 400 400 200 100 200ka pdb370-3 310a 350kcmil to 4 awg 4 to 14 awg 350 to 4 4 to 14 175 175 100 60 100ka pdb371-1 1/0 to 6 400 400 200 100 200ka pdb371-3 310a 350kcmil to 4 awg (6) 2 to 12 awg 350 to 4 (3) 1/0 to 12 1/0 to 12 175 175 100 60 100ka ampacities 75c per nec? table 310.16 and ul508a table 28.1 ** class g 60a (sc-60) or less or class cc 30a (lp-cc-30, fnq-r-30, ktk-r-30) or less are suitable for all sccr in this table. these blocks available in 1 or 3 poles. pdb321 available in 1, 2, and 3 poles. part number: example: pdb204-1 = single pole pdb204-3 = three pole series pdb series pdb power distribution blocks 1011 sb-bu09622 page 9 of 23 data sheet 1049
f dimensions in [mm] width length height part numbers abcdef (hole) pdb204-3, pdb220-3, pdb280-3 4.27 [108.3] 2.88 [73.2] 2.13 [54.0] 1.62 [41.1] 2.25 [57.2] 0.22 [5.7] pdb323-3, pdb370-3, pdb371-3 6.00 [152.4] 5.50 [139.7] 3.70 [93.9] 3.25 [82.6] 4.75 [120.7] 0.22 [5.7] pdb323-1, pdb370-1, pdb371-1 1.96 [49.8] 3.38 [85.7] 3.32 [85.7] 0.21 [2.5] x 0.41 [10.4] pdb204-1, pdb220-1, pdb280-1 1.07 [27.2] 2.88 [73.2] 1.75 [44.5] 2.25 [57.2] 0.20 [5.1] pdb321-1 1.96 [49.8] 4.00 [101.6] 3.32 [84.3] 1.62 [41.1] 3.37 [85.6] 0.21 [5.3] x 0.41 [10.4] pdb321-2 3.58 [90.9] 4.00 [101.6] 3.32 [84.3] 1.62 [41.1] 3.37 [85.6] 0.21 [5.3] x 0.41 [10.4] pdb321-3 5.20 [132.1] 4.00 [101.6] 3.32 [84.3] 1.62 [41.1] 3.37 [85.6] 0.21 [5.3] x 0.41 [10.4] pdb323-1, pdb370-1, pdb371-1 pdb204-1, pdb220-1, pdb280-1 side c to p side side to p side to p pdb204-3, pdb220-3, pdb280-3 pdb323-3, pdb370-3, pdb371-3 pdb321-1, pdb321-2, pdb321-3 series pdb power distribution blocks 1011 sb-bu09622 page 10 of 23 data sheet 1049
optional covers covers are ordered for each individual pole, i.e. three 1-pole covers for 3-pole block, see table a. except pdb321 blocks have one cover for 1, 2 or 3 pole versions, see table b. (shipped with mounting screws) table a table b block cover block cover pdb2xx-(pole): cpb162-1 pdb321-1 cpdb-1 pdb3xx-(pole): cpdb-1 pdb321-2 cpdb-2 pdb321-3 cpdb-3 supplied with (4) #4 thread-cutting screws assembled as shown textured surface for marking cpdb-1 (single pole) 2.10" cpdb-2 (two pole) 3.72" cpdb-3 (three pole) 5.34" 4.14" part no. minimum enclosure size pdb204-1, -3 16? x 16? x 6.75? pdb220-1, -3 16? x 16? x 6.75? pdb280-1, -3 16? x 16? x 6.75? pdb321-1, -2, -3 24? x 20? x 6.75? pdb323-1, -3 24? x 20? x 6.75? pdb370-1, -3 24? x 20? x 6.75? pdb371-1, -3 24? x 20? x 6.75? series 163 co v er series 162 co v er flat cover part number ?a? dimension cpb162-1 0.94? cpb162-2 1.75? cpb162-3 2.56? series pdb power distribution blocks 1011 sb-bu09622 page 11 of 23 data sheet 1049
line load part number torque trim length hex key cu wire range torque trim length hex key, cu wire range lb-in (nm) in (mm) lb-in (nm) in (mm) slot, stud pdb204-1, -3 2/0 to 8 awg 110 (12.4) 0.700 (17.8) 3/16? 2/0 to 8 awg 110 (12.4) 0.700 (17.8) 3/16? hex 70 to 10mm 2 70 to 10mm 2 4 to 6 awg 25 to 16mm 2 35 (4.0) pdb220-1, -3 2/0 to 8 awg 120 (13.6) 0.670 (17.0) 3/16? 8 awg 25 (2.8) 0.470 (11.9) top row, slot 70 to 10mm 2 10mm 2 0.780 (19.8) bottom row 10 to 14 awg 20 (2.3) 6 to 2.5mm 2 pdb280-1, -3 2/0 to 8 awg 120 (13.6) 0.670 (17.0) 3/16? n/a 50 (5.7) n/a 1/4 - 20 70 to 10mm2 stud 4 to 6 awg 25 to 16mm 2 35 (4.0) pdb321-1, -2, -3 2/0 to 8 awg 120 (13.6) 0.700 (17.8) 3/16? 8 awg 25 (2.8) 0.480 (12.2) top row, slot 70 to 10mm 2 10mm 2 0.800 (20.3) bottom row 10 to 14 awg 20 (2.3) 6 to 2.5mm 2 4 to 6 awg 25 to 16mm 2 35 (4.0) pdb323-1, -3 350 kcmil to 4 awg 275 (31.1) 0.900 (22.9) 5/16? 8 awg 25 (2.8) 1.00 (25.4) top row, slot 185 to 25mm 2 10mm 2 0.450 (11.43) bottom row 10 to 12 awg 20 (2.3) 6 to 4mm 2 4 to 6 awg 25 to 16mm 2 35 (4.0) 0.450 (11.4) top row pdb370-1, -3 350 kcmil to 4 awg 275 (31.1) 0.900 (22.9) 5/16? 8 awg 25 (2.8) 0.630 (16.0) middle row, slot 185 to 25mm 2 10mm 2 0.920 (23.4) bottom row 10 to 14 awg 20 (2.3) 6 to 2.5mm 2 2 to 3 awg 50 (5.7) 35mm 2 pdb371-1, -3 350 kcmil to 4 awg 275 (31.1) 0.900 (22.9) 5/16? 4 to 6 awg 185 to 25mm 2 25 to 16mm 2 45 (5.1) 0.450 (11.4) top row slot top row 8 awg 40 (4.5) 0.630 (16.0) middle row, slot middle row, 10mm 2 0.920 (23.4) bottom row 3/16? hex 10 to 12 awg 35 (4.0) bottom row 6 to 4mm 2 top row bottom row top row bottom row middle row top row bottom row pdb220-1, -3 pdb321-1, -2, -3 pdb323-1, -3 pdb370-1, -3 pdb371-1, -3 trim series pdb power distribution blocks 1011 sb-bu09622 page 12 of 23 data sheet 1049
series 16xxx terminal blocks feature/benefits ? high short-circuit current ratings up to 200ka ? ul1059 recognition agency/standards ? ul 1059 recognized, guide xcfr2, file e221592 ? general industry class per ul 1059, usage catagory c ? csa certified, class 6228-01, file 15364 electrical ? 600vac or dc ? short circuit current ratings up to 200ka, see table ? ampacities up to 310 amps ? 75oc rated connectors ? wire range 14 awg to 350 kcmil cu mechanical ? panel mount ? flammability, ul 94v0 ? tin-plated al connectors suitable for cu conductors terminal copper conductor capability short-circuit current rating data line load configuration conductors max fuse class & amp** part openings per pole line load j t rk1 rk5 number amps wire range wire range awg or awg or lpj jjs lps-rk frs-r sccr line load kcmil kcmil jjn lpn-rk frn-r 16204-1, -2, -3 175a 2/0 to 8 awg 2/0 to 8 awg 2/0 to 8 2/0 to 8 200 200 200 60 200ka 4 to 12 200 200 200 60 200ka 16220-1, 175a 2/0 to 8 awg 4 to 14 awg 2/0 to 8 4 to 14 175 175 100 60 100ka -2, -3 16280-1, 175a 2/0 to 8 awg 1/4-20 x 3/4 stud 2/0 to 8 stud 200 200 100 60 200ka -2, -3 16321-1, 4 to12 400 400 200 100 200ka -2, -3 175a 2/0 to 8 awg 4 to 14 awg 2/0 to 8 4 to 12 175 175 100 60 100ka 16323-1, 400 400 200 100 200ka -2, -3 310a 350kcmil to 4 awg 4 to 12 awg 350 to 4 4 to 8 4 to 12 175 175 100 60 100ka 16370-1, 4 to 8 400 400 200 100 200ka -2, -3 310a 350kcmil to 4 awg 4 to 14 awg 350 to 4 4 to 14 175 175 100 60 100ka 16371-1, 1/0 to 6 400 400 200 100 200ka -2, -3 310a 350kcmil to 4 awg (6) 2 to 12 awg 350 to 4 (3) 1/0 to 12 1/0 to 12 175 175 100 60 100ka ampacities 75c per nec? table 310.16 and ul508a table 28.1 ** class g 60a (sc-60) or less or class cc 30a (lp-cc-30, fnq-r-30, ktk-r-30) or less are suitable for all the sccrs in this table. these blocks available in 1, 2, or 3 poles part number: example: 16204-1 = single pole 16204-3 = three pole series 16xxx series 162 and 163 part no. minimum enclosure size 16204-1, -2, -3 16? x 16? x 6.75? 16220-1, -2, -3 16? x 16? x 6.75? 16280-1, -2, -3 16? x 16? x 6.75? 16321-1, -2, -3 24? x 20? x 6.75? 16323-1, -2, -3 24? x 20? x 6.75? 16370-1, -2, -3 24? x 20? x 6.75? 16371-1, -2, -3 24? x 20? x 6.75? -2, -3 -2, -3 1011 sb-bu09622 page 13 of 23 data sheet 1049
line load part number torque trim length hex key cu wire range torque trim length hex key, cu wire range lb-in (nm) in (mm) lb-in (nm) in (mm) slot, stud 16204-1, -2, -3 2/0 to 8 awg 110 (12.4) 0.700 (17.8) 3/16? 2/0 to 8 awg 110 (12.4) 0.700 (17.8) 3/16? hex 70 to 10mm 2 70 to 10mm 2 4 to 6 awg 25 to 16mm 2 35 (4.0) 16220-1, -2, -3 2/0 to 8 awg 120 (13.6) 0.670 (17.0) 3/16? 8 awg 25 (2.8) 0.470 (11.9) top row, slot 70 to 10mm 2 10mm 2 0.780 (19.8) bottom row 10 to 14 awg 20 (2.3) 6 to 2.5mm 2 16280-1, -2, -3 2/0 to 8 awg 120 (13.6) 0.670 (17.0) 3/16? n/a 50 (5.7) n/a 1/4 - 20 70 to 10mm2 stud 4 to 6 awg 25 to 16mm 2 35 (4.0) 16321-1, -2, -3 2/0 to 8 awg 120 (13.6) 0.700 (17.8) 3/16? 8 awg 25 (2.8) 0.480 (12.2) top row, slot 70 to 10mm 2 10mm 2 0.800 (20.3) bottom row 10 to 14 awg 20 (2.3) 6 to 2.5mm 2 4 to 6 awg 25 to 16mm 2 35 (4.0) 16323-1, -2, -3 350 kcmil to 4 awg 275 (31.1) 0.900 (22.9) 5/16? 8 awg 25 (2.8) 1.00 (25.4) top row, slot 185 to 25mm 2 10mm 2 0.450 (11.43) bottom row 10 to 12 awg 20 (2.3) 6 to 4mm 2 4 to 6 awg 25 to 16mm 2 35 (4.0) 0.450 (11.4) top row 16370-1, -2, -3 350 kcmil to 4 awg 275 (31.1) 0.900 (22.9) 5/16? 8 awg 25 (2.8) 0.630 (16.0) middle row, slot 185 to 25mm 2 10mm 2 0.920 (23.4) bottom row 10 to 14 awg 20 (2.3) 6 to 2.5mm 2 2 to 3 awg 50 (5.7) 35mm 2 16371-1, -2, -3 350 kcmil to 4 awg 275 (31.1) 0.900 (22.9) 5/16? 4 to 6 awg 185 to 25mm 2 25 to 16mm 2 45 (5.1) 0.450 (11.4) top row slot top row 8 awg 40 (4.5) 0.630 (16.0) middle row, slot middle row, 10mm 2 0.920 (23.4) bottom row 3/16? hex 10 to 12 awg 35. (4.0) bottom row 6 to 4mm 2 series 16xxx-x top row bottom row top row bottom row middle row top row bottom row 16220-1, -2, -3 16321-1, -2, -3 16323-1, -2, -3 16370-1, -2, -3 16371-1, -2, -3 trim series 16xxx terminal blocks 1011 sb-bu09622 page 14 of 23 data sheet 1049
series 163 (available 1, 2, and 3 pole) supplied with (4) #4 thread-cutting screws assembled as shown textured surface for marking cpdb-1 (single pole) 2.10" cpdb-2 (two pole) 3.72" cpdb-3 (three pole) 5.34" 4.14" series 162 (available 1, 2, and 3 pole) dimensions for series 162 & 163 (inches) width length height part no. a1 a2 a3 b c d e f g h j k l 162 1.06 1.88 2.60 2.85 1.75 0.81 2.25 0.53 0.31 0.84 0.31 0.20 0.42 163 1.96 3.58 5.20 4.0 3.32 1.62 3.37 slot 0.20? wide x 0.41? long slot 0.42? wide x 0.62? long f d d a b e g k dia. l c'bore load side line side c hj f side c optional covers block cover series 162: cpd162-(pole)* series 163: cpdb-(pole)* *provided with mounting screws flat cover part number ?a? dimension cpb162-1 0.94? cpb162-2 1.75? cpb162-3 2.56? series 162 co v er series 163 co v er series 16xxx terminal blocks 1011 sb-bu09622 page 15 of 23 data sheet 1049
short-circuit current rating data max. fuse class and amp** cu wire torque (1) cu wire j t rk1 rk5 minimum part number amps range lb-in range sccr enclosure line & load max. awg lpj jjs lps-rk frs-r size jjn lpn-rk frn-r 2 to 3 awg 50 2 to 8 200 200 100 60 200ka 4 to 6 awg 45 14002-3-ul 115 8 awg 35 2 to 14 175 175 100 60 100ka 8? x 8? x 4? 10 to 14 awg 35 tb300-03sp-ul 30 10 to 18 awg 16 10 to 18 60 60 60 100ka 8? x 8? x 4? ndn63-wh-ul 65 6 to 18 awg 35 6 to 18 100 100 60 30 100ka 8? x 8? x 4? ndn111-wh-ul 90 2 to 18 awg 32 2 to 18 200 200 200 60 100ka 8? x 8? x 4? **class g 60a (sc-60) or less or class cc 30a (lp-cc-30, fnq-r-30, ktk-r-30) or less are suitable for all sccrs in this table 14002-3-ul barrier terminal block agency/standards ? ul 1059 recognized, guide xcfr2, file e62622 ? general industry class per ul 1059, usage category c electrical ? 600vac or dc ? short-circuit current rating up to 200ka, see table ? 75oc rated connectors, 115a ampacity ? wire range 2 to 4 awg cu mechanical ? panel mount ? 3 pole configuration ? flammability, ul94 hb 1.250 (31.75) 0.375 (9.52) 0.625 (15.88) 0.875 (22.23) 0.750 (19.05) 2.375 (60.32) 1011 sb-bu09622 page 16 of 23 data sheet 1049 terminal blocks with high short-circuit current ratings
1.50 (38.10) 1.67 (42.41) 1.45 (36.83) 1.17 (29.71) ndn63-wh-ul agency/standards ? ul 1059 recognized, guide xcfr2, file e62622 ? general industry class per ul 1059, usage category c electrical ? 600vac or dc ? short-circuit current rating up to 100ka, see table page 16 ? 65a ampacity ? wire range 6 to 18 awg cu mechanical ? 35mm din rail and c-rail mount ? .375? (9.52) pole to pole spacing ? 3 pole configuration ? marking tape mt12- 1 ? 2 ? flammability, ul94 v2 tb300-03sp-ul double row terminal block agency/standards ? ul 1059 recognized, guide xcfr2, file e62622 ? general industry class per ul 1059, usage category c electrical ? 600vac or dc ? short-circuit current rating up to 100ka, see table page 16 ? 30a ampacity ? wire range 10 to 18 awg cu mechanical ? panel mount ? .562? (14.28) pole to pole spacing ? 3 pole configuration ? flammability, ul94 v0 .22 (5.6) .56 (14.2) .56 (14.2) .412 (10.4) .21dia. (5.3) .21 .25 slots (5.3 6.3) 1.33 (33.8) .90 (22.8) .81 (20.5) .50 (12.7) 2.25 (57.15) 8-32 binding head scre - tb 300 .33 (8.4) 2.69 (68.32) terminal blocks with high short-circuit current ratings 1011 sb-bu09622 page 17 of 23 data sheet 1049
1.87 (47.50) .62 (15.75) 1.44 (36.57) 1.71 (43.48) 1.46 (37.13) mtg. holes .18 (4.57) dia. .28 (7.11) c'bores dovetail option ndn111-wh-ul agency/standards ? ul 1059 recognized, guide xcfr2, file e62622 ? general industry class per ul 1059, usage category c electrical ? 600vac or dc ? short-circuit current rating up to 100ka, see table page 16 ? 90a ampacity ? wire range 2 to 18 awg cu mechanical ? panel mount ? 35mm din rail and c-rail mount ? .635? (16.13mm) pole to pole spacing ? 3 pole configuration ? marking tape mt12- 1 ? 2 ? flammability, ul94 v2 1011 sb-bu09622 page 18 of 23 data sheet 1049 terminal blocks with high short-circuit current ratings
proper application when applying power distribution blocks (pdbs) and terminal blocks, there are several requirements that must be satisfied, based upon various ul standards, the nec ? , and the specific application. some of the requirements and ratings include: voltage, continuous current, wire range (load and line side), conductor terminal temperature rating, short-circuit current rating or withstand rating (sccr), type and amp rating of upstream overcurrent protective device (fuse or circuit breaker) and spacing (between uninsulated live part and uninsulated grounded part or uninsulated live parts of opposite polarity). the requirements vary, based on the application for industrial control panels (feeder circuit or branch circuit), field applications, or hvac applications. new requirements in the 2005 nec ? for a marked short- circuit current rating (sccr) on industrial control panels (nec ? 409.110), industrial machinery (nec ? 670.3a), and commercial/industrial hvac equipment (nec ? 440.4(b)) have resulted in considerable attention being placed upon the proper selection and application of power distribution blocks and terminal blocks. in addition, ul508a industrial control panels has a requirement that the assembly be marked with its short-circuit current rating. per ul508a, each power circuit component in the panel, such as a pdb, has a sccr expressed in amperes or kiloamperes and voltage. the sccr shall be established by either being marked on the product, the instruction sheet provided with it, or from ul508a supplement sb table sb4.1. if an assembly short- circuit current rating above 10,000 amperes is desired, a power distribution block or a terminal block with a high short-circuit current rating must normally be utilized. the following material includes some application notes on power distribution block and terminal block sccr, ul listed 1953 vs ul recognized 1059, spacing requirements, conductor ampacities, conductor termination ratings affecting conductor ratings, and sccr for multi-lug switches and circuit breakers. ul listed 1953 vs. ul recognized 1059 listed products simply require checking to ensure that the product is used in accordance with its listing and labeling. however, for recognized products, such as terminal blocks, the conditions of acceptability must be investigated to ensure the product is suitable for the specific application, and then the procedure description must be documented in the manufacturers procedure for the assembly. most power distribution blocks available today are actually terminal blocks, and are recognized to ul 1059, the terminal block standard. terminal blocks may or may not meet the spacing needed for oem applications. terminal blocks are marked with a ul recognition mark to ensure that the designer and ul inspector checks, among other things, that there is adequate spacing for the oem application in which they are being applied. power distribution blocks are evaluated to ul1953, the power distribution block outline of investigation and are listed for general installation, which means they have adequate spacing for most oem and field applications. these power distribution blocks are marked with a listing mark, which means that the inspector does not need to check conditions of acceptability as is needed with recognized products. as listed products, pdbs evaluated to ul1953 are suitable for use in the field. for example, an electrical contractor may install them in a metal wireway, something that may not be done with a recognized product such as a terminal block. marking equipment with sccr marking the equipment with its short-circuit current rating (sccr) is another important consideration in the proper application of pdbs and terminal blocks. this datasheet provides the details on cooper bussmann power distribution blocks and terminal blocks that have high short-circuit current ratings. using these pdbs and terminal blocks with appropriate overcurrent protective devices makes it easier to achieve a high short-circuit current rating for the entire panel assembly. sccr for wire management products there are different ways to determine the sccr for wire management products (power distribution blocks, terminal blocks and multi-lug connectors) per ul508a supplement sb: (1) use tested and listed combinations, which consist of a specific part number and a specific type and maximum size overcurrent protective device. for instance, the power distribution blocks in this datasheet are all sccr tested and listed combinations with fuses. an upstream current-limiting fuse of a specific class and maximum ampere rating as shown in the tables can be used to achieve the sccr in the tables. otherwise, the sccr of the power distribution block will be determined by (2) or (3). combination sccrs up to 200ka use t ables specified fuse class with amp rating no greater than maximum shown 1011 sb-bu09622 page 19 of 23 data sheet 1049 application notes
(2) ul508a has provisions to raise the rating of power distribution blocks by the use of current-limiting overcurrent protective devices such as current-limiting fuses (i.e. class j, t, rk1, etc.) in the feeder portion of the circuit. (3) if the sccr rating for a power distribution block, terminal block or multi-lug connector is not established by (1) or (2) above, then the sccr is the default 10ka per ul508a, supplement sb, table sb4.1. for more in depth application material on sccr see industrial control panel section of publication spd or advanced guide to understanding assembly short-circuit current rating. sccr for multi-lug connector (power distribution lug) switch and circuit breaker switches or circuit breakers with multi-lug connectors for conductor terminations serve a very similar wire management function as power distribution blocks. however, it cannot be assumed that when a multi-lug connector is installed on a circuit breaker or switch, that the sccr of the multi-lug connector is the same as the interrupting rating of the protective device. multi-lug connectors are covered under ul standard 486 a/b. much like a power distribution block, multi-lug connectors are components for distributing tap conductors to power loads and are not an integral part of the overcurrent protective device operation. therefore, the multi-lug connector must be evaluated in a short-circuit test with the specific overcurrent protective device and listed with a specific combination sccr. it is important to note, most switches and circuit breakers are not short-circuit tested with multi-lug connectors. if a multi-lug connector on a circuit breaker or switch does not have a combination sccr with the specific overcurrent protective device used, then it is to be treated in the same manner as an unmarked power distribution block, which means the sccr is the default 10ka (ul508a, supplement sb). to repeat, unless the switch or circuit breaker with a multi-lug connector is specifically marked with a short-circuit current rating, the actual short- circuit current rating is 10,000 amperes (or less, if the interrupting rating of the circuit breaker or fuse is less than 10,000 amperes). the use of a listed and tested combination sccr will ensure that a higher rating is achieved for the product and aid in achieving a higher overall sccr for the industrial control panel. pdb spacing requirements for equipment: depending upon the specific application and the standard to which the equipment is being designed, there are certain pdbs that can meet these spacing requirements, some with a high sccr. the following details the spacing requirements at 600v based upon the equipment standards. industrial control panels (ul508a): ul508a contains three important requirements to consider when applying power distribution blocks. ? spacing of 1? through air, 2? over surface (301 to 600v) is required when used in a feeder circuit (thats everything ahead of or on the line side of the final branch circuit overcurrent protective device). ? an assumed short-circuit current rating of 10ka for power distribution and terminal blocks not marked with a higher short-circuit current rating, per ul508a table sb4.1. ? conductor ampacity requirements based on conductor terminal temperature ratings and ul508a conductor ampacities the following details the requirements regarding the use of power distribution blocks in industrial control panels. use of power distribution blocks in industrial control panel feeder circuits (600v & below) ? a listed pdb (ul1953) can be used as is since it meets the 2? and 1? spacing requirements for feeder circuits in ul508a section 10.2 (see table 10.2) & 28.2.4. ? a recognized terminal block (ul1059) can only be used if it meets the spacing requirements in ul508a sections 10.2 (see table 10.2) & 28.2.1 and it is suitable for field wiring (use group a, c or d of ul 1059). C use group a: service including dead-front switch boards, panelboards, service equipment, and the like. C use group b: commercial appliances, including business equipment, electronic data processing equipment, and the like. C use group c: industrial, general. C use group d: industrial, devices having limited ratings. such as where the load on any single circuit of the terminal block does not exceed 15 amperes at 51 to 150 volts, 10 amperes at 151 to 300 volts, 5 amperes at 301 to 600 volts, or the maximum ampere rating, whichever is less. listed pdbs have adequate spacing for feeder circuit applications but most recognized terminal blocks dont have the spacing required for use in feeder circuits spacing between spacing between live parts of live parts and ul standard opposite polarity grounded parts or enclosure @600v 508a feeder circuits 508a branch circuits 1995 hvac through air over surface @600v @600v 1? 2? 1? 3 ? 8 ? 1 ? 2 ? 1 ? 2 ? 3 ? 8 ? 1 ? 2 ? 1 ? 2 ? note: refer to specific ul standards for complete spacing details. application notes 1011 sb-bu09622 page 20 of 23 data sheet 1049
use of power distribution blocks in industrial control panel branch circuits (600v & below) ? a listed pdb (ul1953) can be used as is since it exceeds the spacing requirements for branch circuits in ul508a section 10.2 (see table 10.1) & 28.2.4. ? a recognized terminal block (ul1059) can only be used if it meets the spacing requirements at the required voltage in ul 508a, section 10.2 (see table 10.1) & 28.2.1 and it is suitable for field wiring (use group a, c or d of ul 1059). power distribution block application examples ul 508a termination ratings important considerations in the electrical and thermal relationship for components in a circuit are the conductor size, material, rated ampacity, conductor insulation temperature rating and the permissible connector device conductor temperature limits. if a conductor terminates at two devices that have conductor terminations rated at two different temperatures, the conductor ampacity must correlate to the terminal with the lowest temperature rating. conductors with higher temperature ratings can be used at their rated ampacities if the terminations of the circuit devices are rated for the higher temperature rated conductor [nec 110.14(c)(1)(a)(3)]. however, the industry norm is that most devices rated 100a or less, such as blocks, disconnects, controllers and circuit breakers, have 60c or 75c rated terminations. for circuits greater than 100a, the norm is 75c terminations. ul508a has further internal wiring restrictions requiring 90c insulated conductors, but these conductors are sized based on either 60oc or 75oc allowable ampacities. terminations have a temperature rating that must be observed and this has implications on permissible conductor temperature rating and ampacity. shown below are three common termination ratings and the rules. the conductor ampacity may also have to be derated due to ambient, conduit fill or other reasons. terminal temp rating 60c, 75c, 90c or higher temperature rated 60c conductor can be used, but the ampacity of the conductor must be based as if conductor is rated 60c. 75c, 90c or higher temperature rated conductor 75c can be used, but the ampacity of the conductor must be based as if conductor is rated 75c. a 60c conductor is not permitted to be used. dual temperature rated termination. either 60c conductors at 60c ampacity or 75c conductors at 60c/75c 75c ampacity can be used. if 90c or higher temperature rated conductor is used, the ampacity of the conductor must be based as if conductor is rated 75c. pdb in ul 508a, 480v feeder circuit must have spacing of 1? through air and 2? over suface. pdbs listed to ul 1953 meet these spacing requirements. terminal blocks recognized to ul 1059 must be verified to have required spacing. pdb in ul508a, 480v branch circuit must have spacing of 3 ? 8 ? through air and 1 ? 2 ? over surface. pdbs listed to ul 1953 meet these spacing as well as most terminal blocks recognized to ul 1059. 75? terminal 60? terminal conductor size and insulation rating? listed pdbs have adequate spacing for branch circuit applications and most recognized terminal blocks are also adequate for branch circuit applications 1011 sb-bu09622 page 21 of 23 data sheet 1049 application notes
for more information on this see section conductor & terminations C application considerations in the cooper bussmann publication spd C selecting protective devices on www.cooperbussmann.com ul 508a industrial control panels conductors for internal wiring: copper conductors only. conductors are sized based on either the 60c or 75c allowable conductor ampacities from ul508a, table 28.1 (following). the 75c ampacities can only be used if the termination temperature ratings at both ends of the conductor are rated 75c or 60c/75c. in addition, the conductor insulation is required to be 90c or higher temperature rated even though the ampacity is based on 60c or 75c (ul508a, 29.2.1 & 29.6.1(b)). hvac equipment (ul1995): the electrical panel is required to be marked with the assembly sccr per nec ? 440.4(b). the larger spacing that is mandated in ul508a is not present in ul1995. if the control panel for the hvac equipment is a listed ul508a panel, then the larger ul508a spacing is required. power distribution block application ul 1995 example pdb in 480v ul 1995 hvac equipment must have spacing of 3/8? through air and 1/2? over surface. pdbs listed to ul 1953 meet this spacing as well as most terminal blocks recognized to ul 1059. ul508a, table 28.1 (partial) wire size 60oc (140of) 75oc (167of) awg (mm 2 ) copper copper 14 (2.1) 15 15 12 (3.3) 20 20 10 (5.3) 30 30 8 (8.4) 40 50 6 (13.3) 55 65 4 (21.2) 70 85 3 (26.7) 85 100 2 (33.6) 95 115 1 (42.4) 110 130 1/0 (53.5) C 150 2/0 (67.4) C 175 3/0 (85.0) C 200 4/0 (107.2) C 230 250 kcmil (127) C 255 300 (152) C 285 350 (177) C 310 400 (203) C 335 500 (253) C 380 600 (304) C 420 700 (355) C 460 750 (380) C 475 800 (405) C 490 900 (456) C 520 1000 (506) C 545 1250 (633) C 590 1500 (760) C 625 1750 (887) C 650 2000 (1013) C 665 notes 1 for multiple-conductors of the same size (1/0 awg or larger) at a terminal, the ampacity is equal to the value in this table for that conductor multiplied by the number of conductors that the terminal is able to accommodate. 1011 sb-bu09622 page 22 of 23 data sheet 1049 application notes
new 2005 nec requirements for wireways: ul1953 listed power distribution blocks are suitable for the new 2005 nec ? requirement in section 376.56(b) for field installation in metal wireways, if they are the enclosed type (series pdbfs) or open type with cover. ul1953 is explicit in paragraph 1.1 that these devices are used for splicing and tapping conductors in metallic wireways, junction boxes, auxilary gutters, etc. listed devices can be field installed; however, recognized devices are not intended for field installation. ul1059 devices are recognized and are terminal blocks, not power distribution blocks. therefore ul1059 devices are not suitable for field installation and are not suitable for metal wireway applications even if enclosed or with covers. also, the sccr rating of a power distribution block installed in a metal wireway shall be equal to or greater than the available short-circuit current at the point of application (nec ? 110-10). national electrical code : 376.56(b) power distribution blocks. (1) installation. power distribution blocks installed in metal wireways shall be listed. (4) live parts. power distribution blocks shall not have exposed live parts in the wireway after installation. power distribution block application wireway example series pdb (open style) with covers and series pdbfs (enclosed style) are suitable for installation in metal wireways. when installed in metal wireways, the nec now requires a power distribution block that is listed (acceptableto ahj). it must be an enclosed pdb or equipped with a cover to prevent exposure of live parts. series pdbfs (enclosed style) and series pdb with optional covers are ul1953 power distribution blocks and are suitable for metal wireway applications. terminal blocks, ul1059 recognized devices, are not suitable for this application. application notes 1011 sb-bu09622 page 23 of 23 data sheet 1049

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