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