Re: AWG WIRE TABLE for Coilers (fwd)

---------- Forwarded message ----------
Date: Fri, 1 May 1998 20:20:44 +0500
From: "Alfred A. Skrocki" <alfred.skrocki-at-cybernetworking-dot-com>
To: Tesla List <tesla-at-pupman-dot-com>, Tesla List <tesla-at-pupman-dot-com>
Subject: Re: AWG WIRE TABLE for Coilers (fwd)

On Thu, 30 Apr 1998 20:32:50 -0700 Antonio C. M. de Queiroz
<acmq-at-compuland-dot-com.br> wrote;

> Do someone know what is the official formula? and the reason
> for it?

I poked around the local library and found in Bernard Grob's "Basic 
Electricity" Fifth edition by McGraw-Hill Book Company 1984, page 210
in Chapter 11 part 11-2 Standard Wire Gauge Sizes, the following;

   Table 11-1 lists the standard wire sizes in the system
   known as American Wire Gauge (AWG), or Brown and Sharpe
   (B&S) gauge. The gauge numbers specify the size of round
   wire in terms of it's diameter and cross-sectional circular
   area. Note the following;

   1. As the gauge numbers increase from 1 to 40, the diameter
      and circular area decrease. Higher gauge numbers indicate
      thinner wire sizes.

   2. The circular area doubles for every three gauge sizes.
      For example, No. 10  wire has approximately twice the area
      of a No. 13 wire.

   3. The higher the gauge number and the thinner the wire, the
      greater the resistance of the wire for any given length.

No reason is given for this relationship. I do know that the B&S gauge used 
for non-ferrous sheet metal is the same as the B&S wire gauge.


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