[yial]

The type of wire I suggested is easily found in the U.S. (apologies for my bias there) as large as 6g. 10-12g would be in the right range I believe.

The shielding might not be needed, the low cost for single conductor wire is why I mentioned it.

The person I was responding to was mentioning they can’t find appropriate “main power” cable. (So probably not in the USA )