Which type of conduit is referred to in Article 342?

The conduit referred to in Article 342 of the National Electrical Code (NEC) is Type Rigid Metal Conduit (RMC). This type of conduit is designed for use in harsh environments and provides mechanical protection for electrical conductors. It is made from metal, which gives it high strength and durability against physical damage and environmental factors.

Type RMC is often used in commercial and industrial settings where additional protection is necessary for wiring systems. It also has the added benefit of being resistant to corrosion when appropriately coated.

The other types of conduits mentioned are recognized for different applications and have distinct characteristics. Intermediate Metal Conduit (IMC), for instance, is a lighter option than RMC but still provides a level of protection, while Flexible Metal Conduit (FMC) is designed for more flexible applications and is not as strong as RMC. Type UF refers to underground feeder cable, not conduit, which serves a different purpose. Understanding these distinctions helps clarify why Type RMC is the specific conduit mentioned in Article 342.