That plug is 4 pin so no neutral.pretty sure it's a single phase machine with a 3 phase plug on it (but only 1 phase connected iniside)
take the plug off the end and see how many wires it has in it
I do the same thing at work if I have something that needs more than a 13amp 3 pin plug
very possible the machine should have a data plate on the back with the relevant details take a picture of thatThey could have simply used a 3 phase plug and socket on a single phase supply
It could be from USA, their 3 phase is 240v I think.
Whats the bet they used the 3ph earth pin combined for the neutral, wouldn't be the first time it's been done,Check the cable Inside the plug they could simply be using 1 phase and neutral 240 volts hmm edit no neutral pin
This would be my bet tooWhats the bet they used the 3ph earth pin combined for the neutral, wouldn't be the first time it's been done.
a bit hard luck if there was an rcd fittedThis would be my bet too