It's a 70's property, TT, extended in 2011. They obviously took one look at the ancient Wylex fuse board and decided to split the tails in a Henley and run a 16mm t&e sub main into a new split board supplying the extension.
The water and gas bonds 10mm, yet to be verified, go into the extension board and I've been asked to replace the original board. British gas have installed two new rods (600mm apart?!).
So, the way in which the sub main is installed is non compliant, exposed cores etc, and in my opinion the tails should be split into a switch fuse and the 16mm run from there. I'm thinking that RCD protection can be omitted as the 16mm runs in stud walls and under the floor.
This is an ugly job and I don't like it but I don't want my prejudices to incur additional cost for the client. So am I right in thinking that the 6mm cpc in the t&e is sufficient for the earthing and bonding for the replacement board (as it's TT) and can I just replace the old Wylex board and leave the flakey sub main as is?
Furthermore, if the 16mm t&e did run <50mm and required RCD then how would that work? Is the answer don't run t&e in those circumstances?
