[SI-LIST] : Question Re: Wire Gauge and resistivity

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From: Doug Brooks (doug@eskimo.com)
Date: Mon Nov 13 2000 - 10:36:54 PST


1. Can someone point me to a URL that would have a spec sheet that would
include the resistivity and temperature coefficient of resistivity for the
type of copper used in PCB construction?

2. Can someone point me to a URL that explains how to make resistance
calculations of wires at different temperatures using the temperature
coefficient of resistivity. I know how to do it, but I can't find a
reference that I can point to in an article to tell others how to do it.

3. What is the original derivation of the AWG (American Wire Gauge) system.
There is obviously a logarithmic relationship between gauge and
cross-sectional area:
Wire Gauge ~ Log(1/Area)
but why is that? How were the original gauge numbers defined?

Thanks for any help

Doug Brooks
.
************************************************************
Doug Brooks' book "Electrical Engineering for the Non-Degreed
Engineer" is now available. See our web site for details.
.
Doug Brooks, President doug@eskimo.com
UltraCAD Design, Inc. http://www.ultracad.com

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