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.
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