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This page contains errors. I found the following:

Could not make the formula for awg to diameter (or reverse) work right.

In section "watts generated in a wire" the example wire diameter is .205cm OK so far. But then when you calculate surface area for finding heat rise, .0205m is used instead of .00205m

Temperatures T1 and T2 are not defined. Where did the 298 (yes, I know, 25 C, but never explained) and the 30c come from?

Because of the incorrect surface area I think the real result should be 3.5 degrees not 0.35. But when I work it I get more like 30 degrees, which seems implausible for 10 amps in 12 gauge wire. So I have an error as well.

I hope this helps. - erik at evmfg dot com.