2 PHASE supply to machine

[mike the sparky]

I'm carrying out an EICR to a machine shop ( they make machine guns!). One machine is a sciaky P282 hot riveter. This starts out as a 3 phase, neutral & earth set up at the DB; then terminates in a rotary isolator 30 metres away where it changes to what I assumed was a single phase supply. This single phase supply is supplied from the red and blue cables in the isolator. Another 20 metres away is a MEM switched isolator next to the machine. A check inside this confirms 400volts. The machine has a built in transformer but no wiring diagrams are available. To me it seems to be a 230 volt machine but the operators tell me that there have been no operating issues. Is there such a machine that is 400volt, 2 phase, no neutral or is this potentially dangerous

 

[SKY]

I have fitted quite a few 2 phase forklift truck chargers - the first one I ever did made me think for a while!

 

[GLENNSPARK]

Seen welders that a 400v 2 phase.

stick plant

 

[Knobhead]

Not just stick plant.