Fill Limitation for Surface Metal Raceway

The conductors, including splices and taps, in a metal surface raceway having a removable cover shall not fill the raceway to more than ____% of its cross-sectional area at that point.

a) 38
b) 40
c) 53
d) 75

See answer and applicable Code reference

The correct answer is: d) 75

Article 386 covers the use, installation, and construction specifications for surface metal raceways and associated fittings. As outlined in Sec. 386.56, "The conductors, including splices and taps, shall not fill the raceway to more than 75% of its area at that point."

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