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.
A. The requirements of Sec. 300.22 apply to the installation and uses of electrical wiring and equipment in plenum spaces for environmental air. (C) Plenum Spaces for ...
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