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Re: wire gage chart with maximum frequency for 100% skin depth



Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx>

At 06:21 PM 3/18/2007, you wrote:
Original poster: "alfred erpel" <alfred@xxxxxxxxx>

All,

The link below has a wire gage thickness chart (bare wire, no insulation), and the maximum frequency for 100% skin depth of each wire gage. Note that this frequency increases with the cube of the increase in wire diameter.


I think it's the square.. AWG 10 and AWG30 have diameters that are 10:1. 2.6kHz and 270kHz (the frequencies) are 100:1.

Skin depth goes as sqrt(f).

But, the frequency at which skindepth=0.5 radius probably isn't a particularly useful number. The skin depth calculation assumes an infinite flat plate, for which a round conductor with significant penetration might not be a good model. A better way to express the data would be to figure the frequency at which the AC resistance is, say, twice the DC resistance.


<http://www.powerstream.com/Wire_Size.htm>http://www.powerstream.com/Wire_Size.htm


Al Erpel
USA, PA, 18901



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There was the engineer that was putting sea water in his batteries without the boss knowing. He was arrested for salt-in-battery, but even though the charge wouldn't hold up, he is sitting in his cell serving a current sentence.