Eaton Bussmann Power Distribution &Terminal Blocks Product Introduction
【选型】Eaton Bussmann(伊顿巴斯曼) 配电和接线端子选型指南
选型目录：
Product Introduction
Power Distribution Blocks
Power Terminal Blocks
For product data sheets, visit www
.cooperb
ussmann.com/da
tasheets/ulcsa
2
2
9
9
4
4
Power Distribution & Terminal Blocks
Selection Table for SCCR Power Distribution Blocks and
Power 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 power terminal blocks (PTBs) 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 PTBs, 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 2008 NEC
®
and UL 508A Listed Industrial
Control Panels. Marking the SCCR on Industrial Control
Panels (NEC
®
409.110), Industrial Machinery Electrical
Panels (NEC
®
607.3(A)), and HVAC equipment (NEC®
440.4(B)) is now required by the National Electrical Code.
PDBs or PTBs not marked with a SCCR, typically are the
weakest link 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 PTBs must be evaluated for proper spac-
ings). Also, for building wiring systems, the PDBFS Series
and PDB Series power distribution blocks can be used to
meet the new 2008 NEC
®
requirements in section 376.56(B)
for PDBs in wireways.
Industrial
Industrial
Control
Control
HVAC
Wireways
Description
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
295
UL 1953 Listed
Yes
†
Yes
Yes
Yes
Yes
Yes
Yes
Ye s
Series PDB
296
UL 1953 Listed
No***
Yes
Yes
Yes
Yes
Yes
w/optional
cover
Selection Table
† IP20 finger-safe under specific conditions, see datasheet 1149.
*When protected by proper fuse class with maximum ampere rating specified or less.
** See
PDB Spacing Requirements for Equipment
table below.
***Optional covers are available. Not IP20, 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 & PTB Minimum Spacing
Requirements for Equipment
Data Sheet: 1049
Series PDBFS
Series PDB
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