The RCD is completely disconnected now, not a single wire in it. Press reset and wait a short while and it still clicks out. Is this normal for an RCD like this, or is it faulty?
Thanks to all for your posts. He took the RCD back to the shop, got a new one, all works perfectly.
I am a little worried about a low voltage light above his shower (12v IP65) as it is 2.1 metres above the shower tray and technically I think in zone zero?? It was already there, not fitted by him, and I guess it should be safe enough as it is now protected by the RCD and is only 12v (certainly a lot safer than it was anyway) however it is outside of the current regs from my understanding. Can you get zone zero downlighters for showers with low ceilings?
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