wire calculator

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Thanks for the videos. They’re great. One thing, I tried to use your wire size calculator for sizing a 100 amp, 220 sub panel next to my main panel (6ft run) in copper. It told me 14awg, then 12awg for wire size. Most other calculators will say 3awg. what’s correct?
Thanks again.

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    Oh god no. Use at least a #2 wire