This circuit is inside a 3/4" conduit. It is comprised of three 6 gauge wires (two hots and neutral, with conduit being the ground).
I now realize that choosing that low capacity was a mistake. (with a big welder now in the picture) I would like to know just what would be involved if I wanted to upgrade to 100A.
Can I be able to squeeze, say, two 4 gauge conductors (hots), plus one 8 gauge conductor (neutral), into a 3/4" conduit? Or will I have to replace the conduit too?
I am very regretful of not doing the right thing and going for max capacity. When I did it, the only 220V tool I had was a 3 HP vertical compressor.