Glossary Term: MCM MCM is an abbreviation for thousands of circular mils, an old measurement of wire gauge. 1 MCM = 1 kcmil = 0.5067 square milimeters. A mil is 1/1000 inch. A wire 200 mils in diameter is 40 MCM.Click to see full answer. Simply so, what does MCM mean for wire size?A circular mil is the area of a wire one mil in diameter. One million circular mils is the area of a rod with 1000 mil = 1 inch diameter. MCM—one thousand circular mils. This is an older name for kcmil and is an identical unit.One may also ask, is 500 Kcmil the same as 500 MCM? MCM is the old way of denoting the size, and kcmil is the newer way of stating the same thing. So, here is an example of how this works: Lets say you are pulling a run of 500 MCM or 500 KCMIL. That means you are pulling a conductor that has a cross section of 500,000 circular mils. In this manner, what is bigger 4 0 or 250 MCM? Circular Mils Kcmil sizes are used instead of AWG for sizes larger than 4/0 AWG. The smallest standard size is 250 kcmil, the largest 2000 kcmil. The sizes follow no obvious logic.What is 250 MCM wire?A circular mil is a unit of area, equal to the area of a circle with a diameter of one mil (one thousandth of an inch). For example, one common wire size used in the NEC has a cross-section of 250,000 circular mils, written as 250 kcmil or 250 MCM, which is the first size larger than 0000 AWG used within the NEC.
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