I've seen single phase welders with the common 3 wire 230 plugs and also 4 wire plugs like a clothes dryer plug. I've also seen adapters where a 4 wire plug was converted to a 3 wire. A lot of inverters will run on multiple voltages and single or 3 phase. Maybe the 4th wire is only needed if hooking up to 3 phase power or running higher than 230 volts? I had a single phase 250 amp welder hooked up with a 3 wire plug but the school I went to had single phase welders with a 4 wire plug. The school probably used higher volts or only one leg of 3 phase power.
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