Rigid Metal Conduit (RMC)
The heaviest and most durable type of metal conduit, featuring threaded connections, suitable for severe physical damage environments and outdoor use.
Detailed Explanation
RMC is covered by NEC Article 344. It provides the highest level of physical protection for conductors and can be used in all environments. RMC can serve as an equipment grounding conductor because of its threaded connections providing reliable electrical continuity. It must be supported within 3 feet of each box and at intervals not exceeding 10 feet. RMC is commonly used for service entrance masts, outdoor feeders, and industrial installations.
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