I assume you are looking for the meaning of this acronym.
M = thousands
CM = circular mils
CM is the cross-sectional area of wire whose diameter is measured in MILS
One MIL = One-thousanth of an inch
A lesser ussage is KCM, where K = thousand
Common MCM sizes in the electrical trade are 500, 350, 250 Additional Answer First of all, 'MCM' isn't an acronym; its an abbreviation. 'Acronyms' are words formed from abbreviations, so must be pronounceable which, clearly, 'MCM' isn't!
A circular mil (CM) is a figure that represents the cross-sectional area of a circular-section conductor whose diameter is one mil (i.e. one-thousandth of an inch).
It's important to understand that a circular mil doesn't actually measure cross-sectional area, it merely a figure that represents a cross-sectional area. This is because 'squaring a diameter' doesn't result in a unit of area unless the ratio 'pi' is taken into account (because area = pi x radius2).
To confuse matters further, 'M', in this rather-odd system of measurement, represent '1000' rather than the more-usual 'k'.
Interestingly, the circular mil is a measurement unique to North America. Elsewhere in the world, conductor sizes are measured in square millimetres.
I suppose that MCM is the incorrect acronym for micrometer.
The micrometer is unit of length, with the symbol Î¼m; the value is 0,000 001 m.
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MCM stands for 1900. M is 1000. C is 100. Because a smaller lies before a bigger roman numeral you must substract. So 1000 + (1000-100) = 1900 or MCM.
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