Raceway Covering Requirements

Flat-top underfloor raceways over 4 in. but not over 8 in. wide, with a minimum 1 in. spacing between raceways, shall be covered with concrete to a depth of not less than 1 in. Raceways spaced less than 1 in. apart shall be covered with concrete to a depth of _____.

a) 1 in.
b) 1½ in.
c) 2 in.
d) 4 in.

See answer and applicable Code reference

The correct answer is: b) 1½ in.

Article 390 outlines t

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