Game on!

[Voicecoil]

OK, I see what you mean, I must have read it wrong. But I guess in an industrial setup you're not going to have a 30mA RCD, so similarly it's going to be a matter of working carefully.Anyway it's a lot less scary than 370V DC on the primary side of a power supply (or on the braking terminals of a VFD for that matter )
Interesting to hear you work on PMSM drives, what sort of power? I've only ever come across quite small PMSM's

I could have misunderstood but I think kitwin was making the point that, even with a good chassis earth, you will not notice if you have a short from line or neutral to the chassis.

It's not beyond the wit of man to make a circuit that detects that, if I have a spare moment I might just add one to my isolation transformer. Not that the current arrangement is anything more than temporary until the workshop electrics get sorted out (type F RCCB maybe?), but I can see it might have other uses.

[brman]

OK, I see what you mean, I must have read it wrong. But I guess in an industrial setup you're not going to have a 30mA RCD, so similarly it's going to be a matter of working carefully.Anyway it's a lot less scary than 370V DC on the primary side of a power supply (or on the braking terminals of a VFD for that matter )
Interesting to hear you work on PMSM drives, what sort of power? I've only ever come across quite small PMSM's



It's not beyond the wit of man to make a circuit that detects that, if I have a spare moment I might just add one to my isolation transformer. Not that the current arrangement is anything more than temporary until the workshop electrics get sorted out (type F RCCB maybe?), but I can see it might have other uses.

up to about 1kW motors. It is not our main business though so I don't claim to be any sort of expert.

edit to add: yes, I agree. I am much more worried about being zapped by me putting my finger somewhere it should not be than worried about the possibility of a secondary fault invalidating the protection. But I think Kitwin is right with his warning. It is all to easy to forget that not everyone understands the consequences of what might happen and so might think that an isolation transformer is a guaranteed safe solution.