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
Technical Assistance
Panel Layout
2D and 3D CAD files for some products to facilitate panel
Application Engineering
layouts found at www.cooperbussmann.com
Application Engineering assistance is available to
customers. The Application Engineering team is staffed by
Engineering Services for SCCR
engineers and available by phone with technical and
OSCAR Compliance Software Eliminates the Guesswork in
application support Monday Friday, 8:00 a.m. 5:00 p.m.
Assembly Short-Circuit Current Rating (SCCR) Calculations.
Central Time.
The Cooper Bussmann innovative OSCAR Compliance
Application Engineering can be reached via phone, fax or
Software assists customer compliance with new Code and
standards requirements for short-circuit current ratings as they email:
relate to industrial control panels, equipment and assemblies. Phone: 636-527-1270
Go to www.cooperbussmann.com Fax: 636-527-1607
E-mail: fusetech@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
Online Resources
SCCR review service for UL508A Supplement SB pre-certifica-
Visit www.cooperbussmann.com for the following
tion.
resources:
Arc-flash calculator
Other Application Information on SCCR
OSCAR compliance software
Publications:
Training modules
Advanced Guide To Understanding Assembly Short-Circuit
Current Rating
Services
Simplified Guide To Understanding Short-Circuit Current
Engineering
Rating Find It, Fix It, Forget it
Training
SPD (Selecting Protective Devices) Sections on Industrial
Testing
Control Panels and also Conductor & Terminations.
Contact us for more information on Services:
Phone: 636-207-3294
E-mail: services@cooperbussmann.com
1011 SB-BU09622 Page 1 of 23 Data Sheet 1049Selection Table for SCCR Power Distribution Blocks and
Terminal Blocks
Short-Circuit Current Rated Power Distribution
Control Panels. Marking the SCCR on Industrial Control
Blocks
Panels (NEC 409.110), Industrial Machinery Electrical
Cooper Bussmann offers three distinctly different styles of
Panels (NEC 670.3(A)), and HVAC equipment (NEC
short-circuit current rated power distribution blocks (PDBs)
440.4(B)) is now required by the National Electrical Code.
and terminal blocks (TBs) to match different application
PDBs or TBs not marked with a SCCR are typically one of
needs. The differences are whether the power
the weakest links and may limit an assembly to no more than
distribution blocks are enclosed or not, and whether they are
10kA SCCR. The PDBFS and PDB Series have increased
UL1953 Listed PDBs or UL1059 Recognized TBs, which have
spacing required where used in feeder circuits in equipment
different minimum spacing requirements. The table on this
listed to UL508A (UL1059 TBs must be evaluated for proper
page can assist in the selection of the right series for your
spacings). Also, for building wiring systems, the PDBFS
application requirements.
Series and PDB Series power distribution blocks can be used
to meet the new 2005 NEC requirements in section
Why these are important?
376.56(B) for PDBs in wireways.
Assembly short-circuit current ratings (SCCRs) are now
More application information on pages 19-23.
required in the 2005 NEC and UL508A Listed Industrial
Selection Table
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
UL 1953 Listed
Series PDB 9 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
16 No Yes No Yes No Yes No
14002-3-UL, Terminal Blocks
TB300-03SP-UL
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
Series PDB
Requirements for Equipment
Series PDBFS
Spacing between Spacing between
live parts of live parts and
UL Standard opposite polarity grounded parts
or enclosure
Through air Over surface
@600V
@600V @600V
508A Feeder
1 2 1
Circuits
508A Branch 3 1 1
8 2 2
Circuits
3 1 1
1995 HVAC
8 2 2
Note: Refer to Specific UL standards for complete spacing details.
Series 162 and 163
Magnum Terminal Blocks
1011 SB-BU09622 Page 2 of 23 Data Sheet 1049