I was given a 3 phase plasma cutter (no motor in machine only transformers)and my garage is only 1 phase. I have been doing a little research on converting 1 phase to 3 phase but it is just to expensive for my budget!!! I did come across an article that suggested that is can be done without a phase converter. It was talking about a "sub-phase" not really sure how it works. I do know that a normal 3 phase separation is 120º and with 220v a/c the phase separation is 180º it said that with the "sub-phase" has a 90º phase separation. It does however lower the efficiency of the machine. That I can live with. If anyone knows a way I could do this I would be very thankful.