Quote Originally Posted by kenwhite View Post
For 220-240V 2-phase operation, follow the instructions given previously:

Machine BLACK to wall BLACK
Machine WHITE to wall RED
Machine GREEN to wall BARE (GREEN)
Machine RED and wall WHITE are not used

The green machine wire is connected to the welders chassis, so it must be connected to the grounded conductor, normally bare. In a 2-phase system, one of the hot wires always acts as a return for the circuit, so there is not a common/return wire. The ground wire is for safety, and for chassis noise reduction, so while a 10AWG would work for the noise aspect, it may not be able to handle the current draw before the breaker tripped if a short to chassis were to occur. Plus I am pretty sure the NEC requires the same size wire - I can look it up if you want.

Ken
Ok so from the main pannel I could use 2 6awg wires(white and black) that are comming off 50amp 2 pole breaker for the 2 hots. Then hook up the green wire to ground which is hooked up to the to the box the outlet is wired to so the conduit will then carry the current is something goes wrong. Does this sound right?