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| 型號(hào)： | PDB280-1 |
| 廠商： | COOPER INDUSTRIES |
| 元件分類： | 接線盒 |
| 中文描述： | 175 A, BARRIER STRIP TERMINAL BLOCK, 2 ROWS, 1 DECK |
| 文件頁數(shù)： | 16/23頁 |
| 文件大?。?/td> | 1700K |
| 代理商： | PDB280-1 |
Form No. PDB
Page 23 of 23
Data Sheet #1049
07-05-07
BU-SB07255
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.
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