MC (Metal Clad Cables) contains equipment grounding conductors. The smallest size available according to the NEC that shall be used is # 18 awg copper. Note that some fire rated conductor material is of nickel or nickel-coated copper. There is also cable used for Optical Fiber called MC-OF. The size of the equipment grounding conductor is sized based on Table 250.122 of the National Electrical Code however when part of a cable assembly such as MC, AC, BX, or Romex, NM cable the size required is already determined for you. The allowable
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