COMMENT 8-142 all conductors

[fmtjfw]

I'm looking for constructive criticism on the following, and if you think it is merited, support in the form of comments from you on 8-142. Thanks, Jim Williams

4 Comment:
Revise the text as follows:

red indicates deleted text.

376.56 Splices, Taps, and Power Distribution Blocks.
(A) Splices and Taps. Splices and taps shall be permitted within a wireway, provided they are accessible. The conductors, including splices and taps, shall not fill the wireway to more than 75 percent of its area at that point.
(B) Power Distribution Blocks.
(1) Installation. Power distribution blocks installed in metal wireways shall be listed.
(2) Size of Enclosure. In addition to the wiring space requirement in 376.56(A), the power distribution block shall be installed in a wireway with dimensions not smaller than specified in the installation instructions of the power distribution block.
(3) Wire Bending Space. Wire bending space at the terminals of power distribution blocks shall comply with 312.6(B).
(4) Live Parts. Power distribution blocks shall not have uninsulated live parts exposed within a wireway, whether or not the wireway cover is installed.
(5) Through Conductors. Where the wireway is used for conductors that do not terminate on the power distribution block(s), the through Conductors shall be arranged so the power distribution block terminals are unobstructed following installation.

5 Statement of Problem and Substantiation.

Suggest that obstruction by any conductors is bad.

 

[petersonra]

does this section require that PBD be listed as power distribution blocks? many these days seem to be recognized as terminal blocks rather than PDB. in fact, I think all of the PDB that accept flexible fine stranded wire that I have seen lately are recognized terminal blocks rather than PDB.

 

[fmtjfw]

Is there a difference between PDB and PBD. My dyslexia makes them appear the same


376.56(B)(1) requires listing