Ampacity of Conductors in Auxiliary Gutters

The maximum ampere rating of a 4 in. x ½ in. copper busbar 4 ft long and installed in an auxiliary gutter is _____.

a) 500A
b) 750A
c) 1,500A
d) 2,000A

See answer and applicable Code reference

The correct answer is: d) 2,000A

Article 366 covers the use, installation, and construction requirements of auxiliary gutters and associated fittings. As noted in 366.23(A), "Where the number of current-carrying conductors contained in the sheet

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