I have been using my Pickhill 220 amp stick welder on single phase for a few years but now have the opportunity to put it back on to 3 phase. But I am confused. The sparks who is doing the wiring for me has put a new plug & socket in with 5 wires and I thought 3 phase was only 4 wires. And can anyone tell me where each of the 5 wires go in the terminal box on top of the welder please. I know earth is the central pole but where do other wires in the 3 phase cable go ? Some of the voltage markings have disappeared but I have added what I think is written in the terminal box. What is visible at the moment is how it was wired up for single phase. The blue wire is on terminal 0
And someone told me today that arc welders only use 2 of the phases anyway. Confused.com here. All answers appreciated.