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I had a chance to pop in yesterday. The other electrician's IH is still working. But... Out of curiosity, I clamped the earth - and found over 110mA! I wonder what the other electrician (the one taken responsibility) will say.

Bernard, Thanks for the diagram. The N-E fault/connection was at the N end of the IH element, which had split (I saw it when it was changed again two days ago by the other electrician). That's that particular instance. We don't know why it recurs. I was also shown some of the previous failed...

Thank you, Mike and Bernard, for your continuing posts. I am sorry some upset has occurred. I dare not enter into it, especially as I am new to this forum. Back to the technicals... The site manager and I got electrical contractors in (the ones that did the original installation), seeing as...

Mike, Re your second post today... Bad batch issue... I have just two IHs: the current one and the previous one. Both are the same make and model, but I don't know if they came from the same store. But I bought one from the same store recently and that has been in service for a while now...

Mike, Thanks again. I know threads such as mine take a lot of reading and concentration to get to grips with. I am always grateful to those who make the effort, even if they decide they can't contribute. Unfortunately, I was not able to gain access to the villa today; will try again tomorrow...

Bernard, Thanks; good diagram and annotations. Doesn't apply here, though, because there are no energized loads anywhere in the premises. All 3 phases are isolated at a bunch of 3-pole isolators (one per subDB) in the main DB. The only voltage is the 1.6-ish Volts on the neutral.

Many thanks Mike, I'm off out for the day, but near this particular villa, so I shall check issues from your post and update this later. Re our 'temporary wire': in my 'If I bypass' sentence, you'll see I have already eliminated the original wiring and RCD.

I hope it is only MY logic that is failing... ...and that YOU can figure it out! This happens to be in Cyprus, but it could just as well be the UK or elsewhere. Immersion heater (IH) connected to Neutral-Earth fault. I installed a new one (Backer 314C, 3kW), ran for an hour then RCD tripped...