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Er, yes I have !! Bought but not yet fitted. I had no idea that this was going to be such a difficult job. On reflection I would not have started this one ! I am getting a 80A rcd for it today and will fit that before swapping the boards. Cable size is 10mm and runs direct from the new...

Do you think that the best way forward would be to take the 50A MCB (shower) from the non RCCB side of the box and use a separate stand alone RCD solely for the shower then ?

Thanks very much for that, I had hoped as much. I don't like the last line about the RCD though. This bloody shower is rapidly becoming the "job from hell"!!

Thanks for the quick response. The electricity board wires come from the metre into the main incoming device on the Crabtree (100A). As a split board the first 5 MCB are not covered by the RCCB only the last 5 are. It would be a great help to me if you could briefly, and simply :-) explain...

I am trying to fit a 10.5Kw shower. My current board is old and I can't get new MCB for it. I have just bought a new Crabtree 5 + 5 split load which I want to set up as follows: Incoming 100A (unprotected) with cooker (32A), Heater (16A), Lighting (6A), Lighting (6A) = 60A. 63A RCCB...