Q. What wiring methods does the NEC permit in a Class I, Div. 1 location?
Find the Answer
A. Only the following wiring methods are permitted in a Class I, Div. 1 location [501.10(A)]:
(a) Threaded rigid metal conduit (RMC) or intermediate metal conduit (IMC) with explosionproof fittings.
(b) Mineral insulated (MI) cable terminated with fittings listed for the location.