PDBFS220 datasheet(23/23 Pages) COOPER

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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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