I have a multi occupancy property that is large and has a main 3 phase board. I want to put a consumer unit of roughly 5 ways in each bedsit, and feed them each off this board on a 63a breaker. What size cable would be sufficient to feed this board. Each board will have 1 RCD of a rating of 63a. Will 10mm T&E suffice or does it need to be 16mm? The load in each room will be a cooker with hob, ring main with roughly 6 sockets and a small lighting circuit.