Steel conduit has been in use as a “raceway system” for ... These PVC-coated raceways are generally installed as a system, which means the fittings, conduit bodies, straps, hangers, boxes, etc., are ...

or galvanized rigid metal conduit (GRC), Sec. 110-3 of the NEC requires you to list and label your components. Fittings come in several materials, including cast aluminum, cast malleable iron, cast ...