Wiring methods for underground wiring in commercial garages, repair and storage facilities may now use ________ conduit in addition to threaded rigid metal conduit (RMC) and threaded intermediate metal conduit (IMC).
A) PVC
B) RTRC
C) HDPE
D) all the above where buried under not less than 24 in. of cover, and installed in accordance with the Exception in Sec. 511.8.
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Answer: D
As noted in the Exception to Sec. 511.8, PVC, RTRC and HDPE conduit are permitted to used where buried under not less than 24 in. of cover.
Owen is the owner and president of National Code Seminars and the holder of master electrician certifications in 46 states. He can be reached at [email protected].
