Strange wire size

Frank DuVal

Senior Member
For example, 120mm^2 is actually the real world physical dimension.
So are our 250 mcm (aka 250 kcm) notations. That would be numbers in 1000 circular mils. Everyone in America uses the measurement mils, right?:?:lol:

OK, machinists do everyday.....:thumbsup:

For our metric friends, 1 circular mil is .000507 mm*².

120 mm² / 0.000507 = 236,686 cm (as in circular mils), therefore ~250 mcm.

But do note, the first numbered gauges were from England!;) AWG came later.


And for further trivia,

10 awg = 10 mcm = 5.3 mm² and is very close to a tenth of an inch (.102 in) in diameter.
 

drcampbell

Senior Member
... Everyone in America uses the measurement mils, right?:?:lol: ...
Sure, when talking about property taxes.

Machinists may use mils every day, but I don't think I've ever heard one say the word "mils". It's usually just assumed, and when it's explicitly spoken, it's usually "thou". (thousandths)
 
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