I picked up this Stayer ST22 bench grinder at an auction the other day. I left a bid but apart from a photo I had not seen it. When I went to pick it up it seemed seized solid. It has two 8in grinding wheels fitted and when I checked one had been fitted without the washers and so was jamming the shaft. Good result I thought. Now the tricky part for me. There are three wires coming out of the motor, all black insulation and go to the on/off switch. I apologise for the photos but the data plate shows two wiring circuits. The top one is marked 220v ( the switch seems wired to that way in that the left hand stack from the motor all go to an individual terminal on the switch as do the other three outlets) and the lower is marked 380v. On this setting all three motor wires linked. My question is are both the setups 3 phase or is the 220v for our single phase mains? If it is which one of the three wires is earth. Common sense tells me they are both 3 phase as they are tied together as they come from the motor.