When installing raceways underground in rigid nonmetallic conduit and other approved raceways, there must be a minimum of ___ of cover. a. 6in b. 12in. c. 18in. d. 22in.
When installing raceways underground in rigid nonmetallic conduit and other approved raceways, there must be a minimum of ___ of cover.
a. 6in b. 12in. c. 18in. d. 22in.
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