Cheers RR,
That sounds reasonable, but one point springs to mind - surely the whole point of an RCD is that it is supposed to trip before sufficient current has had chance to flow to do any damage to the poor s*d who is unfortunate enough tb creating the connection from live to earth?
Would the type of RCD you describe provide a lower level of safety than the one that is there at the moment, or would the difference be trivial, as I realise we are talking about pretty low currents here?
On the other hand, it doesn't seem as if I have much choice, as I can't use the lathe at all at the moment.