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Power distribution blocks shall be permitted in pull and junction boxes over 1650 cm3 (100 in.3) for connections of conductors where installed in boxes and where the installation complies with 314.28(E)(1) through (E)(5).
Exception: Equipment grounding terminal bars shall be permitted in smaller enclosures.
(1) Installation
Power distribution blocks installed in boxes shall be listed.
(2) Size
In addition to the overall size requirement in the first sentence of 314.28(A)(2), the power distribution block shall be installed in a box 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.
(4) Live Parts
Power distribution blocks shall not have uninsulated live parts exposed within a box, whether or not the box cover is installed.
(5) Through Conductors
Where the pull or junction boxes are 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.

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