Power Distribution Blocks & Terminal Blocks with High Short-Circuit Current Ratings 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-certification. Other Application Information on SCCR Publications: • Advanced Guide To Understanding Assembly Short-Circuit Current Rating • Simplified Guide To Understanding Short-Circuit Current Rating – Find It, Fix It, Forget it • SPD (Selecting Protective Devices) Sections on Industrial Control Panels and also Conductor & Terminations. 1011 SB-BU09622 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 – Friday, 8:00 a.m. – 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: [email protected] 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: [email protected] Page 1 of 23 Data Sheet 1049 Selection Table for SCCR Power Distribution Blocks and Terminal Blocks 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 info rmation on pages 19-23. Selection Table Product Catalog Page Series PDBFS 3 Series PDB 9 Series 16XXX 13 NDN63-WH-UL, NDN111-WH-UL, 14002-3-UL, TB300-03SP-UL UL High Enclosed SCCR* UL 1059 Recognized Terminal Blocks HVAC UL 1995 Wireways NEC® 376.56(B) (Requires UL 1953) Yes Yes Yes Yes Yes Yes No*** Yes Yes Yes Yes Yes Yes w/optional cover No*** Yes No**** Yes No**** Yes No No Yes No Yes No Yes No UL 1059 Recognized Terminal Blocks 16 Industrial Control Panels UL 508A Feeder Circuit Yes† UL 1953 Listed Power Distribution Blocks UL 1953 Listed Power Distribution Blocks Spacing** 1” Air 2” Surface Industrial Control Panels UL 508A Branch Circuit † 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. PDB & TB Minimum Spacing Requirements for Equipment UL Standard 508A Feeder Circuits 508A Branch Circuits 1995 HVAC Series PDB 1˝ 2˝ 1˝ 3 1 1 ⁄8˝ 3⁄ ˝ 8 ⁄2˝ 1⁄ ˝ 2 ⁄2˝ ⁄2˝ 1 Note: Refer to Specific UL standards for complete spacing details. 1011 SB-BU09622 Series PDBFS Spacing between Spacing between live parts of live parts and opposite polarity grounded parts or enclosure Through air Over surface @600V @600V @600V Magnum Terminal Blocks Page 2 of 23 Data Sheet 1049 Series 162 and 163 Series PDBFS Enclosed Power Distribution Blocks 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 mm2 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 Series PDBFS Electrical Terminal Copper Conductor Capability Line Load Configuration Catalog Number (All Single Pole) Short-Circuit Current Rating Data Conductors Max Fuse Class & Amp** Openings per Pole Amps Wire Range Wire Range Line Load Line Load J T RK1 RK5 AWG or kcmil AWG or kcmil LPJ JJS JJN LPS-RK LPN-RK FRS-R FRN-R 2/0 to 8 200 200 100 60 200kA 4 to 12 200 175 200 200 175 200 100 100 100 60 30 60 200kA 100kA 50kA 350 to 6 400 400 200 100 200kA 400 200 175 600 400 200 400 200 175 600 400 200 200 100 100 400 200 100 100 60 30 200 100 60 200kA 50kA 100kA 200kA 100kA 50kA 350 to 4 600 600 400 200 200kA 600 800* 600 200 200kA 500 to 6 600 600 400 200 100kA PDBFS204 175A 2/0 to 8 AWG 70 to 10 mm2 2/0 to 8 AWG 70 to 10 mm2 2/0 to 8 PDBFS220 175A 2/0 to 8 AWG 70 to 10 mm2 4 to 14 AWG 25 to 2.5 mm2 2/0 to 8 PDBFS303 310A 350kcmil to 6 AWG 350kcmil to 6 AWG 150 to 16 mm2 150 to 16 mm2 350 to 6 PDBFS330 380A 500kcmil to 6 AWG 240 to 16 mm2 2 to 14 AWG 35 to 2.5 mm2 500 to 6 PDBFS377 570A 300kcmil to 4 AWG 150 to 12 mm2 4 to 14 AWG 25 to 2.5 mm2 PDBFS500 620A 350kcmil to 4 AWG 350kcmil to 4 AWG 185 to 12 mm2 185 to 12 mm2 PDBFS504 760A 500kcmil to 6 AWG 500kcmil to 6 AWG 240 to 16 mm2 240 to 16 mm2 4 to 14 2 to 6 300 300 to 4 350 to 4 500 500 to 6 2 to 14 4 to 8 4 4 to 14 500 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. 1011 SB-BU09622 Page 3 of 23 Data Sheet 1049 SCCR Series PDBFS Enclosed Power Distribution Blocks Item 1 2 3 4 5 6 7 Part No. PDBFS204 PDBFS220 PDBFS303 PDBFS330 PDBFS377 PDBFS520 PDBFS504 Width A 1.030[26.16] 1.030[26.16] 1.550[39.37] 1.550[39.37] 1.875[47.62] 2.380[60.45] 2.560[65.02] Length B 3.372[94.80] 3.372[94.80] 4.665[118.50] 4.665[118.50] 4.665[118.50] 4.665[118.50] 4.665[118.50] Dimensions in[mm] Height C D 2.146[54.50] 3.550[90.17] 2.146[54.50] 3.550[90.17] 2.874[73.00] 4.475[113.67] 2.950[74.93] 4.475[113.67] 2.933[74.50] 4.475[113.67] 2.598[66.00] 4.475[113.67] 3.150[80.00] 4.475[113.67] E 2.905[73.79] 2.905[73.79] 3.810[96.77] 3.810[96.77] 3.810[96.77] 3.810[96.77] 3.810[96.77] PDBFS204 F 0.197[5.00] 0.197[5.00] 0.197[5.00] 0.197[5.00] 0.197[5.00] 0.197[5.00] 0.197[5.00] G H 0.197[5.00] N/A 0.197[5.00] N/A 0.236[6.00] N/A 0.236[6.00] N/A 0.236[6.00] N/A 0.236[6.00] N/A 0.236[6.00] 46.00[1.811] PDBFS220 C PDBFS303 1011 SB-BU09622 PDBFS330 Page 4 of 23 Data Sheet 1049 Series PDBFS Enclosed Power Distribution Blocks PDBFS377 PDBFS500 PDBFS504 1011 SB-BU09622 Page 5 of 23 Data Sheet 1049 Series PDBFS Enclosed Power Distribution Blocks Panel Mounting Capable on all part numbers Use 2 screws for mounting each pole (#10 or M5 screw) (4 screws for PDBFS504) OR Hook load side onto 35mm DIN RAIL Open the latch using screwdriver Close the latch 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. DIN Rail Mounting PDBFS204, PDBFS220, PDBFS303, PDBFS377, and PDBFS500 only. Rotate PDB down 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. 2A1279 accessory ordered separately. 1011 SB-BU09622 Page 6 of 23 Data Sheet 1049 Series PDBFS Enclosed Power Distribution Blocks Series PDBFS Line Part Number PDBFS204 CU Wire Range 2/0 to 8 AWG 70 to 10mm2 Load Torque Trim Length Lb-in (Nm) in (mm) 110 (12.4) 0.850 (21.6) Hex Key 3/16˝ CU Wire Range 2/0 to 8 AWG 70 to 10mm2 4 to 6 AWG 2/0 to 8 AWG 70 to 10mm2 120 (13.6) 0.750 (19.0) 8 AWG 3/16˝ 150 to 16mm2 275 (31.1) 1.350 (34.3) 5/16˝ 350 Kcmil to 6 AWG 150 to 16mm2 2 to 3 AWG 4 to 6 AWG 500 Kcmil to 6 AWG 500 (56.5) 1.250 (31.8) 3/8˝ 8 AWG 10 to 14 AWG 4 to 6 AWG 275 (31.1) 1.15 (29.2) top row 1.400 (35.6) bottom row 8 AWG 1/4˝ 20 (2.3) 6 to 2.5mm2 PDBFS504 350 Kcmil to 4 AWG 185 to 25mm2 500 Kcmil to 6 AWG 240 to 16mm2 275 (31.1) 1.250 (31.8) 5/16˝ 500 (56.5) 1.250 (31.8) 3/8˝ 1.250 (31.8) 5/16˝ 0.590 (15.0) top row 1/8˝ 1.200 (30.5) bottom row 0.550 (14.0) top row, 25 (2.8) 10mm2 10 to 14 AWG PDBFS500 350 Kcmil to 4 AWG 185 to 25mm2 500 Kcmil to 6 AWG 240 to 16mm2 1.00 (25.4) middle row Wire Connector Hole Diameter 275 (31.1) 1.250 (31.8) 5/16˝ 500 (56.5) 1.250 (31.8) 3/8˝ 1011 SB-BU09622 Part No. Minimum Enclosure in (mm) PDBFS204 16˝ X 16˝ X 6.75˝ 0.450 (11.5) 0.450 (11.5) PDBFS220 16˝ X 16˝ X 6.75˝ 0.450 (11.5) 0.246 (6.25) PDBFS303 36˝ X 30˝ X 12.625˝ PDBFS303 0.720 (18.3) 0.720 (18.3) PDBFS330 24˝ X 20˝ X 6.75˝ PDBFS330 0.870 (22.1) 0.314 (8.0) PDBFS377 24˝ X 20˝ X 6.75˝ PDBFS377 0.687 (17.5) 0.265 (6.7) PDBFS500 36˝ X 30˝ X 12.625˝ PDBFS500 0.718 (18.2) 0.718 (18.2) PDBFS504 36˝ X 30˝ X 12.625˝ PDBFS504 0.875 (22.2) 0.875 (22.2) Line Load Number in (mm) PDBFS204 PDBFS220 Size Page 7 of 23 1/8˝ 1.220 (31.0) bottom row Trim Part 1/8˝ 35 (4.0) 25 to 16mm2 150 to 25mm2 3/16˝ 35 (4.0) 6 to 2.5mm2 300 Kcmil to 4 AWG 275 (31.1) 40 (4.5) 10mm2 PDBFS377 0.550 (14.0) top row, 0.850 (21.6) bottom row 45 (5.1) 25 to 16mm2 240 to 16mm2 0.970 (24.6) 50 (5.7) 35mm2 PDBFS330 110 (12.4) Hex Key 20 (2.3) 6 to 2.5mm2 350 Kcmil to 6 AWG in (mm) 25 (2.8) 10mm2 10 to 14 AWG PDBFS303 Trim Length Lb-in (Nm) 35 (4.0) 25 to 16mm2 PDBFS220 Torque Data Sheet 1049 Series PDBFS Enclosed Power Distribution Blocks Specific Conditions to Achieve IP-20 Finger-Safe Status for Series PDBFS Line Part Number Trim Length in (mm) PDBFS204 0.850 (21.6) PDBFS220 PDBFS303 PDBFS330 0.750 (19.0) 1.350 (34.3) 1.250 (31.8) 1.15 (29.2) top row, PDBFS377 1.400 (35.6) bottom row Installed Wire 2/0 to 8 AWG 70 to 10mm2 2/0 to 8 AWG 70 to 10mm2 350 Kcmil to 2/0 AWG 150 to 70mm2 1/0 to 6 AWG 50 to 16mm2 500 to 250 Kcmil 240 to 150mm2 4/0 to 6 AWG 120 to 16mm2 300 Kcmil to 4/0 AWG 150 to 120mm2 3/0 to 4 AWG 95 to 25mm2 screws fully opened no wire in hole PDBFS500 PDBFS504 1011 SB-BU09622 1.250 (31.8) 1.250 (31.8) 350 Kcmil to 2/0 AWG 185 to 70mm2 1/0 to 4 AWG 50 to 25mm2 screws fully opened no wire in hole 500 to 350 Kcmil 240 to 185mm2 300 Kcmil to 6 AWG 150 to 16mm2 screws fully opened no wire in hole Load IP-20 Conductor Screw Openings Opening Yes Yes Yes Yes Yes Yes No Yes Yes Yes No Yes Yes Yes No Yes N/A No No N/A Yes Yes No Yes N/A No No N/A Yes Yes No Yes N/A No No N/A Trim Length in (mm) 0.970 (24.6) 0.550 (14.0) top row, 0.850 (21.6) bottom row 1.250 (31.8) 0.590 (15.0) top row, 1.200 (30.5) bottom row 0.550 (14.0) top row, 1.00 (25.4) middle row, 1.220 (31.0) bottom row 1.250 (31.8) 1.250 (31.8) Page 8 of 23 Installed Wire 2/0 to 8 AWG 70 to 10mm2 4 to 14 AWG 25 to 2.5mm2 screws fully opened no wire in hole 350 Kcmil to 2/0 AWG 150 to 70mm2 1/0 to 6 AWG 50 to16mm2 2 to 14 AWG 35 to 2.5mm2 screws fully opened IP-20 Conductor Screw Openings Opening Yes Yes Yes Yes N/A Yes No N/A Yes Yes No Yes Yes Yes N/A Yes no wire in hole No N/A 4 to 14 AWG 25 to 2.5mm2 Yes Yes screws fully opened N/A Yes no wire in hole Yes N/A Yes Yes No Yes N/A No No N/A Yes Yes No Yes N/A No No N/A 350 Kcmil to 2/0 AWG 185 to 70mm2 1/0 to 4 AWG 50 to 25mm2 screws fully opened no wire in hole 500 to 350 Kcmil 240 to 185mm2 300 Kcmil to 6 AWG 150 to 16mm2 screws fully opened no wire in hole Data Sheet 1049 Series PDB Power Distribution Blocks 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 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” Mechanical • Panel mount • Flammability, UL 94V0 • Tin-plated AL connectors suitable for CU conductors Series PDB Terminal Copper Conductor Capability Line Load Configuration Part Number Short-Circuit Current Rating Data Conductors Max Fuse Class & Amp** Openings per Pole Amps Wire Range Wire Range Line Load Line Load J T RK1 RK5 AWG or kcmil AWG or kcmil LPJ JJS JJN LPS-RK LPN-RK FRS-R FRN-R 2/0 to 8 200 200 200 60 200kA 4 to 12 200 200 200 60 200kA 4 to 14 175 175 100 60 100kA Stud 200 200 100 60 200kA 4 to 12 400 400 200 100 200kA 4 to 12 175 175 100 60 100kA 4 to 8 400 400 200 100 200kA 4 to 12 175 175 100 60 100kA 4 to 8 400 400 200 100 200kA 4 to 14 175 175 100 60 100kA 1/0 to 6 400 400 200 100 200kA 1/0 to 12 175 175 100 60 100kA PDB204-1 PDB204-3 175A 2/0 to 8 AWG 2/0 to 8 AWG 2/0 to 8 PDB220-1 PDB220-3 175A 2/0 to 8 AWG 4 to 14 AWG 2/0 to 8 PDB280-1 PDB280-3 175A 2/0 to 8 AWG 1/4-20 X 3/4 STUD 2/0 to 8 PDB321-1 PDB321-2 PDB321-3 175A 2/0 to 8 AWG 4 to 14 AWG 2/0 to 8 PDB323-1 PDB323-3 310A 350kcmil to 4 AWG PDB370-1 PDB370-3 310A 350kcmil to 4 AWG 4 to 14 AWG 350 to 4 PDB371-1 PDB371-3 310A 350kcmil to 4 AWG (6) 2 to 12 AWG (3) 1/0 to 12 350 to 4 4 to 12 AWG 350 to 4 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 1011 SB-BU09622 Page 9 of 23 Data Sheet 1049 SCCR Series PDB Power Distribution Blocks Part Numbers PDB204-3, PDB220-3, PDB280-3 PDB323-3, PDB370-3, PDB371-3 PDB323-1, PDB370-1, PDB371-1 PDB204-1, PDB220-1, PDB280-1 PDB321-1 PDB321-2 PDB321-3 Width A 4.27 [108.3] 6.00 [152.4] 1.96 [49.8] 1.07 [27.2] 1.96 [49.8] 3.58 [90.9] 5.20 [132.1] Length B 2.88 [73.2] 5.50 [139.7] 3.38 [85.7] 2.88 [73.2] 4.00 [101.6] 4.00 [101.6] 4.00 [101.6] Top Dimensions in [mm] Height C D 2.13 [54.0] 1.62 [41.1] 3.70 [93.9] 3.25 [82.6] 3.32 [85.7] — 1.75 [44.5] 3.32 [84.3] 1.62 [41.1] 3.32 [84.3] 1.62 [41.1] 3.32 [84.3] 1.62 [41.1] E 2.25 [57.2] 4.75 [120.7] 2.25 [57.2] 3.37 [85.6] 3.37 [85.6] 3.37 [85.6] F (Hole) 0.22 [5.7] 0.22 [5.7] 0.21 [2.5] X 0.41 [10.4] 0.20 [5.1] 0.21 [5.3] X 0.41 [10.4] 0.21 [5.3] X 0.41 [10.4] 0.21 [5.3] X 0.41 [10.4] Top Side Side PDB204-3, PDB220-3, PDB280-3 PDB323-1, PDB370-1, PDB371-1 Top PDB323-3, PDB370-3, PDB371-3 Side Side F PDB204-1, PDB220-1, PDB280-1 C PDB321-1, PDB321-2, PDB321-3 1011 SB-BU09622 Page 10 of 23 Data Sheet 1049 Series PDB Power Distribution Blocks 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 Series 163 Cover Series 162 Cover Supplied with (4) #4 thread-cutting screws assembled as shown 4.14" Textured surface for marking CPDB-1 (single pole) CPDB-2 (two pole) CPDB-3 (three pole) 2.10" 3.72" 5.34" Part No. Minimum Enclosure 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˝ Flat Cover Part Number ˝A˝ Dimension CPB162-1 0.94˝ CPB162-2 1.75˝ CPB162-3 2.56˝ Size 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˝ 1011 SB-BU09622 Page 11 of 23 Data Sheet 1049 Series PDB Power Distribution Blocks Line Part Number CU Wire Range PDB204-1, -3 2/0 to 8 AWG 70 to 10mm2 Load Torque Trim Length Lb-in (Nm) in (mm) 110 (12.4) 0.700 (17.8) Hex Key CU Wire Range 3/16˝ 2/0 to 8 AWG 70 to 10mm2 4 to 6 AWG 25 to 16mm2 PDB220-1, -3 2/0 to 8 AWG 70 to 10mm2 120 (13.6) 0.670 (17.0) 3/16˝ 8 AWG 10mm2 10 to 14 AWG 6 to 2.5mm2 PDB280-1, -3 2/0 to 8 AWG 70 to 10mm2 120 (13.6) 0.670 (17.0) 3/16˝ N/A 25 to 16mm2 2/0 to 8 AWG 70 to 10mm2 120 (13.6) 0.700 (17.8) 3/16˝ 8 AWG 10mm2 10 to 14 AWG 6 to 2.5mm2 4 to 6 AWG 25 to 16mm2 PDB323-1, -3 350 Kcmil to 4 AWG 185 to 25mm2 275 (31.1) 0.900 (22.9) 5/16˝ 8 AWG 10mm2 10 to 12 AWG 6 to 4mm2 4 to 6 AWG 25 to 16mm2 PDB370-1, -3 350 Kcmil to 4 AWG 185 to 25mm 2 275 (31.1) 0.900 (22.9) 5/16˝ 8 AWG 10mm 2 10 to 14 AWG 6 to 2.5mm2 2 to 3 AWG 35mm2 4 to 6 AWG PDB371-1, -3 350 Kcmil to 4 AWG 185 to 25mm 275 (31.1) 0.900 (22.9) 5/16˝ 2 Trim Length Hex Key, Lb-in (Nm) in (mm) Slot, Stud 110 (12.4) 0.700 (17.8) 3/16˝ Hex 35 (4.0) 25 (2.8) 0.470 (11.9) top row, 0.780 (19.8) bottom row 25 to 16mm2 8 AWG 10mm2 10 to 12 AWG 6 to 4mm2 N/A PDB220-1, -3 1011 SB-BU09622 Top Row Bottom Row Bottom Row 25 (2.8) 0.480 (12.2) top row, 0.800 (20.3) bottom row Slot 35 (4.0) 25 (2.8) 1.00 (25.4) top row, 0.450 (11.43) bottom row Slot 20 (2.3) 35 (4.0) 0.450 (11.4) top row 25 (2.8) 0.630 (16.0) middle row, Slot 0.920 (23.4) bottom row 20 (2.3) 50 (5.7) 45 (5.1) 40 (4.5) 0.450 (11.4) top row Slot top row 0.630 (16.0) middle row, Slot middle row, 0.920 (23.4) bottom row 3/16˝ Hex bottom row 35 (4.0) Bottom Row PDB370-1, -3 PDB371-1, -3 Page 12 of 23 Stud 20 (2.3) Middle Row PDB321-1, -2, -3 PDB323-1, -3 1/4 - 20 35 (4.0) Top Row Top Row Slot 20 (2.3) 50 (5.7) 4 to 6 AWG PDB321-1, -2, -3 Torque Data Sheet 1049 Trim Series 16XXX Terminal Blocks Feature/Benefits • High Short-Circuit Current Ratings up to 200kA • UL1059 Recognition Mechanical • Panel mount • Flammability, UL 94V0 • Tin-plated AL connectors suitable for CU conductors 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 Series 162 and 163 Series 16XXX Terminal Copper Conductor Capability Line Load Configuration Part Number Openings per Pole Amps Wire Range Wire Range Line 16204-1, -2,-2, -3 -3 Short-Circuit Current Rating Data Conductors Max Fuse Class & Amp** Load Line Load J T RK1 RK5 AWG or kcmil AWG or kcmil LPJ JJS JJN LPS-RK LPN-RK FRS-R FRN-R 2/0 to 8 200 200 200 60 200kA 4 to 12 200 200 200 60 200kA 4 to 14 175 175 100 60 100kA Stud 200 200 100 60 200kA 4 to12 400 400 200 100 200kA 4 to 12 175 175 100 60 100kA 4 to 8 400 400 200 100 200kA 4 to 12 175 175 100 60 100kA 4 to 8 400 400 200 100 200kA 4 to 14 175 175 100 60 100kA 1/0 to 6 400 400 200 100 200kA 1/0 to 12 175 175 100 60 100kA 175A 2/0 to 8 AWG 2/0 to 8 AWG 2/0 to 8 175A 2/0 to 8 AWG 4 to 14 AWG 2/0 to 8 16280-1, -2, -3 175A 2/0 to 8 AWG 1/4-20 X 3/4 STUD 2/0 to 8 16321-1, -2, -3 175A 2/0 to 8 AWG 4 to 14 AWG 2/0 to 8 16220-1, -2, -3 16323-1, -2, -3 310A 350kcmil to 4 AWG 16370-1, -2,-2, -3 -3 310A 350kcmil to 4 AWG 4 to 14 AWG 350 to 4 16371-1, -2, -3 310A 350kcmil to 4 AWG (6) 2 to 12 AWG (3) 1/0 to 12 350 to 4 4 to 12 AWG 350 to 4 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 1011 SB-BU09622 Part No. Minimum Enclosure 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˝ Size Page 13 of 23 Data Sheet 1049 SCCR Series 16XXX Terminal Blocks Series 16XXX-X Line Part Number CU Wire Range 16204-1, -2, -3 2/0 to 8 AWG 70 to 10mm2 Load Torque Trim Length Lb-in (Nm) in (mm) 110 (12.4) 0.700 (17.8) Hex Key CU Wire Range 3/16˝ 2/0 to 8 AWG 70 to 10mm2 4 to 6 AWG 25 to 16mm2 16220-1, -2, -3 2/0 to 8 AWG 70 to 10mm2 120 (13.6) 0.670 (17.0) 3/16˝ 8 AWG 10mm2 10 to 14 AWG 6 to 2.5mm2 16280-1, -2, -3 2/0 to 8 AWG 70 to 10mm2 120 (13.6) 0.670 (17.0) 3/16˝ N/A 4 to 6 AWG 25 to 16mm2 16321-1, -2, -3 2/0 to 8 AWG 70 to 10mm2 120 (13.6) 0.700 (17.8) 3/16˝ 8 AWG 10mm2 10 to 14 AWG 6 to 2.5mm2 4 to 6 AWG 25 to 16mm2 16323-1, -2, -3 350 Kcmil to 4 AWG 185 to 25mm2 275 (31.1) 0.900 (22.9) 5/16˝ 8 AWG 10mm2 10 to 12 AWG 6 to 4mm2 4 to 6 AWG 25 to 16mm2 16370-1, -2, -3 350 Kcmil to 4 AWG 185 to 25mm2 275 (31.1) 0.900 (22.9) 5/16˝ 8 AWG 10mm2 10 to 14 AWG 6 to 2.5mm2 2 to 3 AWG 35mm2 4 to 6 AWG 16371-1, -2, -3 350 Kcmil to 4 AWG 275 (31.1) 0.900 (22.9) 5/16˝ 185 to 25mm2 25 to 16mm2 8 AWG 10mm2 10 to 12 AWG 6 to 4mm2 Torque Trim Length Hex Key, Lb-in (Nm) in (mm) Slot, Stud 110 (12.4) 0.700 (17.8) 3/16˝ Hex 35 (4.0) 25 (2.8) 0.470 (11.9) top row, 0.780 (19.8) bottom row Slot 20 (2.3) 50 (5.7) N/A 1/4 - 20 Stud 35 (4.0) 25 (2.8) 0.480 (12.2) top row, 0.800 (20.3) bottom row Slot 20 (2.3) 35 (4.0) 25 (2.8) 1.00 (25.4) top row, 0.450 (11.43) bottom row Slot 20 (2.3) 35 (4.0) 0.450 (11.4) top row 25 (2.8) 0.630 (16.0) middle row, Slot 0.920 (23.4) bottom row 20 (2.3) 50 (5.7) 45 (5.1) 0.450 (11.4) top row 0.630 (16.0) middle row, 40 (4.5) 0.920 (23.4) bottom row Slot top row Slot middle row, 3/16˝ Hex bottom row 35. (4.0) Trim Top Row 16220-1, -2, -3 1011 SB-BU09622 Top Row Top Row Bottom Row Bottom Row Middle Row 16321-1, -2, -3 16323-1, -2, -3 Bottom Row 16370-1, -2, -3 16371-1, -2, -3 Page 14 of 23 Data Sheet 1049 Series 16XXX Terminal Blocks Dimensions for Series 162 & 163 (Inches) Width Length Height Part No. A1 A2 A3 B C 162 1.06 1.88 2.60 2.85 1.75 163 1.96 3.58 5.20 4.0 3.32 D 0.81 1.62 Series 162 (Available 1, 2, and 3 pole) E 2.25 3.37 F 0.53 — G 0.31 — H 0.84 — J K L 0.31 0.20 0.42 — Slot 0.20˝ wide x 0.41˝ long Slot 0.42˝ wide x 0.62˝ long Series 163 (Available 1, 2, and 3 pole) H J LINE SIDE C Side A F D D B E F C K Dia. G L C'Bore LOAD SIDE Optional covers Block Cover Series 162: CPD162-(pole)* Series 163: CPDB-(pole)* *Provided with mounting screws Series 163 Cover Series 162 Cover Supplied with (4) #4 thread-cutting screws assembled as shown 4.14" Textured surface for marking CPDB-1 (single pole) CPDB-2 (two pole) CPDB-3 (three pole) 2.10" 3.72" 5.34" Flat Cover 1011 SB-BU09622 Page 15 of 23 Data Sheet 1049 Part Number ˝A˝ Dimension CPB162-1 0.94˝ CPB162-2 1.75˝ CPB162-3 2.56˝ Terminal Blocks With High Short-Circuit Current Ratings Part Number Amps 14002-3-UL 115 TB300-03SP-UL NDN63-WH-UL NDN111-WH-UL 30 65 90 Short-Circuit Current Rating Data Max. Fuse Class and Amp** J T RK1 RK5 SCCR JJS LPS-RK FRS-R LPJ JJN LPN-RK FRN-R CU Wire Range Line & Load Torque lb-in MAX. (1) CU Wire Range AWG Minimum Enclosure Size 2 to 3 AWG 4 to 6 AWG 8 AWG 10 to 14 AWG 10 to 18 AWG 6 to 18 AWG 2 to 18 AWG 50 45 35 35 16 35 32 2 to 8 200 200 100 60 200kA 2 to 14 175 175 100 60 100kA 8˝ x 8˝ x 4˝ 10 to 18 6 to 18 2 to 18 60 100 200 60 100 200 60 60 200 — 30 60 100kA 100kA 100kA 8˝ x 8˝ x 4˝ 8˝ x 8˝ x 4˝ 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 2.375 (60.32) 0.875 (22.23) 0.375 (9.52) 0.750 (19.05) Mechanical • Panel mount • 3 pole configuration • Flammability, UL94 HB 0.625 (15.88) 1.250 (31.75) 1011 SB-BU09622 Page 16 of 23 Data Sheet 1049 Terminal Blocks With High Short-Circuit Current Ratings 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 1.50 (38.10) 1.67 (42.41) 1.45 (36.83) 1.17 (29.71) 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 8-32 binding head screw - TB 300 2.25 (57.15) .22 (5.6) 2.69 (68.32) .90 1.33 (22.8) (33.8) .50 (12.7) .56 (14.2) .21dia. (5.3) .412 (10.4) .81 (20.5) .33 (8.4) 1011 SB-BU09622 Page 17 of 23 .21 x .25 slots (5.3 x 6.3) .56 (14.2) Data Sheet 1049 Terminal Blocks With High Short-Circuit Current Ratings 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 Mtg. holes .18 (4.57) dia. .28 (7.11) c'bores 1.46 (37.13) 1.71 (43.48) Dovetail Option .62 (15.75) 1.87 (47.50) 1.44 (36.57) 1011 SB-BU09622 Page 18 of 23 Data Sheet 1049 Application Notes 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 shortcircuit 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 shortcircuit 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. 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 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 manufacturer’s procedure for the assembly. Use Tables Specified fuse class with amp rating no greater than maximum shown 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 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 shortcircuit 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. 1011 SB-BU09622 UL Standard 508A Feeder Circuits 508A Branch Circuits 1995 HVAC Spacing between Spacing between live parts of live parts and opposite polarity grounded parts or enclosure Through air Over surface @600V @600V @600V 1˝ 2˝ 1˝ 3 1 1 ⁄8˝ 3⁄ ˝ 8 ⁄2˝ 1⁄ ˝ 2 ⁄2˝ ⁄2˝ 1 Note: Refer to Specific UL standards for complete spacing details. 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 (that’s 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). – Use Group A: Service — including dead-front switch boards, panelboards, service equipment, and the like. – Use Group B: Commercial appliances, including business equipment, electronic data processing equipment, and the like. – Use Group C: Industrial, general. – 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 don’t have the spacing required for use in feeder circuits Page 20 of 23 Data Sheet 1049 Application Notes 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). Listed PDBs have adequate spacing for branch circuit applications and most recognized terminal blocks are also adequate for branch circuit applications 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. 60°C terminal 75°C terminal Power Distribution Block Application Examples – UL 508A Conductor size and insulation 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 60°C or 75°C rated terminations. For circuits greater than 100A, the norm is 75°C terminations. UL508A has further internal wiring restrictions requiring 90°C insulated conductors, but these conductors are sized based on either 60ºC or 75ºC allowable ampacities. 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. 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 60°C 75°C 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. 60°C/75°C 1011 Page 21 of 23 SB-BU09622 60°C, 75°C, 90°C or higher temperature rated conductor can be used, but the ampacity of the conductor must be based as if conductor is rated 60°C. 75°C, 90°C or higher temperature rated conductor can be used, but the ampacity of the conductor must be based as if conductor is rated 75°C. A 60°C conductor is not permitted to be used. Dual temperature rated termination. Either 60°C conductors at 60°C ampacity or 75°C conductors at 75°C ampacity can be used. If 90°C or higher temperature rated conductor is used, the ampacity of the conductor must be based as if conductor is rated 75°C. Data Sheet 1049 Application Notes For more information on this see section Conductor & Terminations – Application Considerations in the Cooper Bussmann publication SPD – 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 60°C or 75°C allowable conductor ampacities from UL508A, Table 28.1 (following). The 75°C ampacities can only be used if the termination temperature ratings at both ends of the conductor are rated 75°C or 60°C/75°C. In addition, the conductor insulation is required to be 90°C or higher temperature rated even though the ampacity is based on 60°C or 75°C (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 UL508A, Table 28.1 (Partial) Wire size AWG (mm2) 14 (2.1) 12 (3.3) 10 (5.3) 8 (8.4) 6 (13.3) 4 (21.2) 3 (26.7) 2 (33.6) 1 (42.4) 1/0 (53.5) 2/0 (67.4) 3/0 (85.0) 4/0 (107.2) 250 kcmil (127) 300 (152) 350 (177) 400 (203) 500 (253) 600 (304) 700 (355) 750 (380) 800 (405) 900 (456) 1000 (506) 1250 (633) 1500 (760) 1750 (887) 2000 (1013) 60ºC (140ºF) Copper 15 20 30 40 55 70 85 95 110 – – – – – – – – – – – – – – – – – – – 75ºC (167ºF) Copper 15 20 30 50 65 85 100 115 130 150 175 200 230 255 285 310 335 380 420 460 475 490 520 545 590 625 650 665 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. 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. 1011 SB-BU09622 Page 23 of 23 Data Sheet 1049