Which type of conduit is known as Type MC?

Type MC refers to Metal-Clad Cable, which is a type of electrical cable that consists of one or more conductors insulated and protected by a metal sheath, typically made of aluminum or steel. This metal sheath provides mechanical protection as well as grounding for the conductors within, making it suitable for various installations where added protection from physical damage is required. It's often used in areas where flexibility is advantageous, such as in commercial and industrial settings.

The other options are associated with different kinds of conduit or protective systems. Plastic conduit, for example, serves as a lightweight and corrosion-resistant option but does not offer the same degree of mechanical protection that metal-clad cable does. Rigid metal conduit is known for its toughness and rigidity but does not have the same configuration as Type MC, which includes insulated conductors. Intermediate metal conduit is also rigid and provides a different level of protection compared to the flexible, multi-conductor design of Metal-Clad Cable. Understanding these distinctions is important when selecting the appropriate type of wiring method for specific applications in accordance with the National Electrical Code (NEC).