Working with Metal Clad (MC) Cable

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• published: 31 May 2015
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-l though MC resembles its close relative, armored cable, there are some distinct differences. Whereas armored cable has a grounding strip in intimate contact with the inside of the metallic sheath, which can then serve as the equipment grounding conductor, MC cable has no such strip. Therefore, the outer sheath of MC cable does not qualify as an equipment grounding conductor. MC cable contains an insulated grounding conductor which, when properly terminated at both ends, makes a reliable return path for fault current, enabling the overcurrent device to perform its protective role. The metal jacket serves to supplement the equipment grounding conductor since it is firmly clamped to grounded metal enclosures at both ends — so that the unit cannot become energized without instantly causing the overcurrent device to trip out. EC&M;