Rigid metal conduit — RMC (ferrous metal).RMC is a listed threaded metal raceway of circular cross section with a coupling, which can be either a standard straight tapped conduit coupling or the ...

Article 344 covers the use, installation, and construction specifications for rigid metal conduit (RMC) and associated fittings. As noted in Sec. 344.42(A), the couplings and connectors shall be of a ...