Wire is rated in amps for safety reasons. As long as you stay under this limit, the sizing is all dependent on voltage and length.
The same wire drops the same volts per amp per length.
A piece of wire that drops 1.2v at 10A at 120v is perfectly fine.
It wouldn't be appropriate for 12v 10A, because it will still drop 1.2v. (10%)
You didn't say DC side or AC side.
DC side is more dangerous btw.
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