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Article #5876A conundrum about the AWG (wire gauge) table
From: Jim Roth
Date: Wed, 29 Aug 1990 03:13
Date: Wed, 29 Aug 1990 03:13
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1291 bytes
Many of the standard values in electronics and elsewhere follow an
approximate log/exp scale to accomodate a wide range of values.
Examples are resistors, ISO 3'rd octave audio frequencies, etc.
Wire gauges are no exception, but here's an odd thing - virtually
none of the diameters or areas in circular mills are "round numbers".
Yet when we take logs, we find that each jump of 10 wire gauges
increases the cross sectional area of the wire not by a nice round
number like 10, but by about 10**1.007!
Examples:
gauge area log(ratio)
----- ------ ----------
0 105500 1.007055
10 10380 1.006747
20 1022 1.007285
30 100.5 1.007058
40 9.888
Why the brain-damaged exponent?
How on earth was that table created in the first place?
- Jim
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!mailrus!cs.utexas.edu!sdd.hp.com!decwrl!bacchus.pa.dec.com!shlump.nac.dec.com!ryn.esg.dec.com!allvax!jroth From: jroth@allvax.dec.com (Jim Roth) Newsgroups: sci.electronics Subject: A conundrum about the AWG (wire gauge) table Summary: How was the AWG table created? Message-ID: <2588@ryn.esg.dec.com> Date: 29 Aug 90 03:13:20 GMT Sender: guest@ryn.esg.dec.com Organization: Digital Equipment Corporation Lines: 28