... effective *UL standard 1242 Intermediate metal conduit, or IMC for short, is a rigid steel electrical conduit that is lighter in weight ... & cables. It does the work of a similar conduit, galvanized rigid conduit (GRC), but with much less weight & thickness size ... ½” to 4”. ********************* HANYSEN has done extensive studies on conduit strength and reliability of its product, IMC. On this product ...