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A mil is a thousandth of an inch â .001 inch. It is a typical manufacturing dimension. When we make a product we specify the thickness as a mil. How do you visualize such a small dimension? In order to help people understand what the mil thickness of a product is, I try to give them a point of reference.
Quick Answer. Both MCM and kcmil mean 1,000 circular mils, which is a unit used to measure the area of the circular cross section of a wire. The terms MCM and kcmil are used interchangeably by the National Electric Code to describe wires that are larger than 0000 American wire gauge. Continue Reading