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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
PS ---- click on the 'humor' button for more like this
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.