Heavy-wall RMC and medium-wall IMC metal conduit route wire and cable in heavy-duty applications. It's crush-resistant and rigid, making it suitable for long runs along building walls and floors in areas like industrial manufacturing facilities. It can also be used outdoors and for direct-burial applications. Each type of metal conduit also has specific fittings that join pieces of conduit together or join them to enclosures and devices. The fittings are not interchangeable among conduit types.