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# FW: Awg formula, (correction to previous post)

```Original poster: "John H. Couture by way of Terry Fritz <twftesla-at-uswest-dot-net>" <couturejh-at-worldnet.att-dot-net>

Bart -

The MCM stands for thousands of circular mils, not millions. For example
1000 MCM means one million circular mils or a bare solid wire one inch in
diameter. However, a solid wire this size has probably never been
manufactured. Normally wires larger than #6 AWG are stranded. This means
that a 1000 MCM bare wire will always be stranded and greater than one inch
in diameter because of the stranding. The area of the wire, however, will
equal one million circular mils. This is true for both copper and aluminum
wires that are used for electrical circuits. I hope I have it right this
time.

John Couture

---------------------------------

-----Original Message-----
From: John H. Couture [mailto:couturejh-at-worldnet.att-dot-net]
Sent: Tuesday, February 06, 2001 4:02 PM
To: Tesla list
Subject: RE: Awg formula, was "New formula for secondary resonant
frequency"

Bart -

I obtained the equation many years ago from the Simplex Wire & Cable Co. You
did a lot better than many other people in past years trying to come up with
a different equation.

Note that for 4/0 AWG wire that  x = 0  and  dia = .46 inches.
All equations have to take 1/0, 2/0, 3/0, and 4/0 (x=3,2,1,0) into
consideration.

The AWG table then changes to MCM for larger wires. The MCM stands for
millions of circular mils. A circular mil is the area of a circle one mil in
diameter. A solid wire one inch in diameter has an area of one million
circular mils. One square inch equals  4/pi x 1,000,000 CM = 1,273,200 CM .
It can be confusing. However, it does avoid decimals in specifying wire
sizes, a lot of which I did in the past.

John Couture

----------------------------------

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Tuesday, February 06, 2001 6:49 AM
To: tesla-at-pupman-dot-com
Subject: Re: Awg formula, was "New formula for secondary resonant
frequency"

Original poster: "Barton B. Anderson by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <tesla123-at-pacbell-dot-net>

John C.,
Thanks for posting. I remember trying to find this info a long time ago and
could never get data. I eventually got together with someone at work to
derive
a formula (which was successful). Now it seems there are three or four
equations floating around. Isn't this list great!

BTW, when you state "the standard", I assume you grabbed the equations from
wire manufacturers?

Take care,
Bart

Tesla list wrote:
>
> Original poster: "John H. Couture by way of Terry Fritz
> <twftesla-at-uswest-dot-net>" <couturejh-at-worldnet.att-dot-net>
>
> I understand the standard equation for the AWG is
>
>     Dia inches = .46/(1.122932)^x
>
> where x = wire gauge + 3
>
> Example  # 24 AWG    x = 27
>
>     dia ins = .46/(1.122932)^27 = .02010 ins
>     dia mm  = .02010 * 25.4     = .51054 mm
>
>           # 18 AWG   x = 21
>
>     dia ins = .46/(1.122932)^21 =  .04030 ins
>     dia mm  = .04030 * 25.4     = 1.02362 mm
>
> John Couture
>
> -------------------------------
>
> -----Original Message-----
> From: Tesla list [<mailto:tesla-at-pupman-dot-com>mailto:tesla-at-pupman-dot-com]
> Sent: Monday, February 05, 2001 6:31 AM
> To: tesla-at-pupman-dot-com
> Subject: Re: Awg formula, was "New formula for secondary resonant
> frequency"
>
> Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>"
> <paul-at-abelian.demon.co.uk>
>
> Bart wrote:
>
-------------------------------   snip

```