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The main consumer box is under the staircase & bathroom is above & a little further back from it. I have not yet figured out the best path to take as yet. Maybe through cavity of outside wall to roof ceiling than back down into shower point in bathroom. BTW: To connect the RCCB unit from the...

Thanks for the very clear reply Davy & thanks to you also Tim. I wanted to fit a 9.5KW electric shower & use RCCB unit as my main consumer unit is fully populated. I was thinking of using 10mm cable & the RCCB that comes with a 50A MCB as opposed to 40A MCB. WIl this cable be sufficient for...

Does the AMP rating of the MCB fitted with in a RCCB have to match up exactly with the showers AMP rating or can it be higher ? For instance when fitting a 8.5KW 40A shower can I safely use a RCCB with a 50A MCB or does it have to be 40A rating ? I would really appreciate a firm reply...

Hello, I have run into a small problem & was wondering if someone could give me some guidance. I have a Crabtree C50 consumer unit which is already fully populated & i need to add another 30A MCB for electric shower. There is a 30A MCB in the unit already but it is used for the electric...