I wish to install a 8.5KW electrical shower in the top floor of a house. The house wiring is slightly unusual in that it is divided into three separate zones each with its own consumer unit. The top floor is unit is supplied with 16mm cable which I assume is fine for the shower. There are no other heavy duty electrical items on the top floor (there is just a couple of ring circuits and a lighting circuit)
However the consumer unit has no spare fuse ways and there is no RCD protection on the top floor circuit. Therefore I would have to buy a separate consumer unit for the shower and split the incoming 16mm cable so that I can feed both the original unit and the new shower consumer unit.
I=92ve had a look around and I think the following items would work.
For splitting the cable:
As to earth bonding in the bathroom the only metal is the pipes so they are the only items that need to be bonded.
I would be grateful if anybody can confirm that this is all OK and whether there is any cheaper/easy alternatives with regard the consumer unit and junction box.
I am aware of part P but having installed two showers in the past feel competent enough to do it.