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

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Original poster: "alfred erpel" <alfred@xxxxxxxxx>


Jim,

        You are correct.  I don't know how I thought that it was a cube
power relationship.  Here is a link with some formulas (the inverse square
relationship is clear).   http://www.sigcon.com/Pubs/news/skineffect.htm

Regards,
Al Erpel
USA, PA, 18901


>
> Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx>

> 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.