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Photo 1. Rigid metal conduit (RMC) is the thickest-wall and heaviest-weight steel conduit. Intermediate Metal Conduit — IMC (ferrous metal). Developed in the '70s, IMC is a listed threaded steel ...
Rigid metal conduit must be provided with expansion fittings if necessary to compensate for thermal expansion and contraction [Sec. 300.7(B)]. The expansion characteristics for metal raceways are ...
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