




#140029  01/13/04 07:19 PM
AWG

Junior Member
Registered: 01/11/04
Posts: 5
Loc: Dover, DE

Ok its prob been asked a dozen times and explained but using the filters with AWG or wire size I get back 1000's of posts so I'll just ask again ...
Whats with AWG?
OK metric, nice and simple, its 2.5mm2 so we call it 2.5mm2, its a nice discriptive term thats easy to understand. Bigger cable bigger number, smaller cable smaller number. Simple.
Now I know the US AWG lists, and roughly what us brits would equate it to. My difficulty is in understanding the *why*. I see they picked a midrange cable as 1 AWG .. Smaller wires go up to 18 AWG, larger wires get an *00* rating (eg 1/0 2/0 until the bigger cables are hit with the 250 Kcmil and onward numbers.
I understand the progression. I dont understand, nor can seem to find, where they pulled these numbers from. Is there a table equating actual size to the AWG number so that you can see a logical progression? Or are they just called so *just because they are* because thats they way they are produced?
I guess I am just having trouble with the *reasoning* for the AWG system. like I say I understand its progression and can equate the cable sizes, I just dont get where they pulled the size scale from.
Prob a real simple answer .. but anyways over to you.
Shaine~
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Shaine~

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#140030  01/13/04 08:54 PM
Re: AWG

Member
Registered: 05/16/01
Posts: 728
Loc: Lorton, Va USA

Brief 'splanation, Lucy. The AWG was based on circular mil area. The starting point was #10 wire, which, when it was initiated, had a cma of 10,000 circular mils. It has since been redefined as a cma of 10,380, no, I can't really explain why. ( I do understand it has to do with more accurate measuring equipment, but....). A more detailed explanation can be found in 25 of the American Electricians Handbook, it does go into an explanation of weights and resistances and how they were chosen. The Brown and Sharpe gauge is the same, and Table 285 gives a listing of other gauges and their equivalents.

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