OK, muddled through my 1987 copy of the National Electric Code and surmised
that I can hook up my wife's three electric kilns (since there is no 120
volt component in the kilns) by running only three wires. 2 hot leads and
one neutral. These three wires come from a secondary panel that has both
neutral and ground. One panel back, is the main panel where the neutral and
ground are bonded together.
Question: As long as I am doing this, I would like to drop of a fourth
outlet, should I ever need to use my welder at this location of the shop. I
have an old Miller TIG and an old Solar MIG. The leads on these machines
are 50 amp three wire. Should I be bringing over a ground wire from the
panel for the welders? What do I do with this "fourth" wire? The
receptacles and welder plugs only have three wires? Is the neutral wire
sufficient to serve as ground? etc.

BTW, I ran #4 awg to these outlets. I know it's overkill, but, found 3 - 75
ft. brand new pieces at a garage sale for only $ 4.00.

Please help with my confusion!!

Ivan Vegvary