that's what I think is happening too. (its what I alluded to in the first post)

I don't think it would operate any cpd either. I didn't get a shock touching the case of the unit. It's still a safety issue though.

woulnt this happen if any element went down to ground though, and not operate the cpd? The only way to protect it would be to install a RCBO/RCD (GFI)

I took my time, I hurried up, The choice was mine, I didn't think enough