MCM

1. MCM is an abbreviation for Thousands of Circular Mils. Electrical wire larger than 0000 (4/0) is measured in MCM, according to the cross section of the conductor. A mil is 1/1000th of an inch.

MCM is an obsolete unit of measure that has been replaced by kcmil, which means the same thing as MCM.

2. Metal Cold Mirror. A designation (as opposed to EA, Enhanced Aluminum) for the reflector in an ETC SourceFour PAR. MCM is a dichroic coated glass filter reflector allowing heat to pass through and reflecting only visible light. Cannot take a 750W lamp.

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