I guessed the square Copper wire came from a welder too.…..
The 2nd option would be a 'Isolation transformer'.
Both of these items can be found around for cheap, auctions, clearouts, yard sales etc.
Technology's catching up and Invertor welders are cheap and RCD's do a better job than a isolation transformer.
And old Welding leads are full of bright coily Berry Copper wire...
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