Useful information on copper and temperature calculations
can be found at http://www.aracnet.com/cgi-usr/gpatrick/

Trace Width Calculator at http://www.aracnet.com/cgi-usr/gpatrick/trace.pl
and references and formula at http://www.aracnet.com/~gpatrick/trace_ref.html

I think there are some misplaced decimal points in the table.
More realistic values are:
  7 AMP 45C (113F) .145
  10 AMP 45C (113F) .225

> > Minimum Conductor Widths For PCBs
> > Temperature Rise Above Ambient
> > For 1/2 oz Copper
> > Amperage Ambient Temperature Conductor Width
> > 1 AMP 45C (113F) .013
> > 1.5 AMP 45C (113F) .025
> > 2 AMP 45C (113F) .033
> > 3 AMP 45C (113F) .050
> > 4 AMP 45C (113F) .073
> > 5 AMP 45C (113F) .110
> > 6 AMP 45C (113F) .125
> > 7 AMP 45C (113F) 1.45
> > 10 AMP 45C (113F) 2.25
>
>Hmmm, seems AWFULLY nonlinear!  13 mils is good for
>one amp, but you need 173 times more for 10 A?  I find that
>hard to believe, unless this was done at RF frequencies where
>edge effects dominate.  I've been building servo amps and
>such gear running 10 A on roughly 250 mil traces (1 Oz Cu),
>but that is low frequency.
>
>Jon

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