Kimba said:
I think what they are saying is:
To RECONNECT the supply after the isolater is fitted, they want a cert. My advise would be take the main fuse out and proceed with the work, then call them out when the work is complete to have the isolater fitter (For any future modifications) and also the fuse resealed.
Otherwise they will come out, disconnect, fit and isolater, then refuse to reconect until the work is completed.
Yes, I see how you read it, and I'm sure you're right, but there isn't much logic in the fact that the supply can continue, even if it may be dodgy, but to fit an isolator, it then needs to be seen to.
Any way, great fun today, fitted a new consumer unit, checked everything before reconnecting on and found a direct short between the neutral and earth on the socket ring (only one for the whole house).
Didn't stop anything working with the old board, as there was no earth leakage.
After a long search, and pulling up floorboards, found and old 13A socket floating around between the floorboards and ceiling. (the house had walls taken out to merge bedrooms, but it has been rewired since then).
In the process, found unearthed sockets, screws so loose that the cables come out of the socket as you take them away from the wall, one live wire right out of a socket so there was no ring.
Scary thing is that had I not have fitted the new consumer unit and tested, would never have known anything was wrong. (until too late maybe)