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This is 12-gauge, two-conductor metal-clad cable with a solid copper conductor, a green ground wire, and interlocking aluminum armor. The armor protects the conductors without conduit, so it runs along walls, ceilings, and joists in exposed or concealed branch wiring. It is rated to 600V and 90°C in dry locations, and the 12-gauge copper suits 20A circuits. It competes with BX and EMT-plus-wire on install speed: the armor is lighter than rigid conduit, but it costs more than plain NM-B and needs listed MC connectors and anti-short bushings at every box.
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This 12/2 MC cable is a metal-clad electrical cable for power distribution up to 600 volts. It is rated 90°C dry and 75°C wet. It is used for branch circuits, lighting and dedicated appliance circuits.
It has two solid copper conductors with THHN/THWN insulation, which resists moisture, heat and chemicals. A green insulated grounding conductor is included. An aluminum interlocking armor protects the cable mechanically and is crush- and rodent-resistant. The armor removes the need for conduit, and the cable is lightweight.
Applications include 20A branch circuits, kitchen countertop circuits, bathroom and laundry circuits with GFCI protection, office and retail lighting, HVAC controls, small motors and exhaust fans. It is approved for environmental air-handling spaces under NEC 300.22(C). It is also used in UL 1, 2 and 3-hour fire-rated through-penetration systems.
