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 ...

Running electric power to a garage or garden pond? Learn about code requirements, trench depth options, conduit material and ...

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 ...