Metal Clad Cable

A factory assembly of one or more insulated circuit conductors with or without optical fiber members enclosed in an armor of interlocking metal tape, or a smooth or corrugated metallic sheath.

Conductors: Conductors shall be of copper, aluminum, copper-clad aluminum, nickel or nickel-coated copper, solid or stranded. The minimum conductor size shall be 18 AWG copper, nickel, or nickel-coated copper, or 12 AWG aluminum or copper-clad aluminum.

Equipment Grounding Conductor: Where Type MC Cable is used to provide an equipment grounding conductor, it shall comply with 250.118(10) and 250.122.

Sheath: Metallic covering shall be one of the following types: smooth metallic sheath, corrugated metallic sheath, or interlocking metal tape armor. The metallic sheath shall be continuous and close fitting. A nonmagnetic sheath or armor shall be used on single conductor Type MC. Supplemental protection of an outer covering of corrosion-resistant material shall be required where such protection is needed. The sheath shall not be used as a current-carrying conductor.