Heavy-wall RMC metal conduit is the most durable and rugged type of metallic conduit. It has the heaviest and thickest walls, making it suitable for routing and protecting conductors in areas that could be exposed to abuse, as well as outdoors and in direct-burial applications. This conduit can also provide structural support for electrical cable, panels, and other equipment. RMC has one threaded male end and one threaded female connector. Uncoupled ends are covered by industry color-coded thread protectors, which keep them clean and sharp and aid in trade size recognition.

Medium-wall IMC metal conduit is more lightweight than heavy-wall RMC metal conduit, but it offers a comparable level of strength. It protects wire and cable in long runs along building walls and floors in heavy-duty applications like industrial manufacturing facilities. It can also be used outdoors and for direct-burial applications, or it can provide structural support for electrical cable, panels, and other equipment. IMC has one threaded male end and one threaded female connector. Uncoupled ends are covered by industry color-coded thread protectors, which keep them clean and sharp and aid in trade size recognition.