John Rumm wrote in
:

with the existing setup, and I rarely get any inexplicable tripping
of the circuit breakers. As far as I am aware, the old fuse boxes
(even when fuses contained fuse wire) did what they were designed to
do, with no problems.

They did what they were supposed to - and will still do so. The main
thing your current setup lacks is RCD protection.


Thanks to all for the excellently helpful advice.

If I added an RCD covering the entire house (without replacing the existing
fuse box which is already fitted with MCBs, would that constitute a change
to the wiring and thus require building control notification?

Would doing this significantly improve the house's safety rating in the
eyes of, say, a house-purchaser's surveyor?

I note that in another thread recently, someone seemed alarmed that someone
was planning to install an electric shower without RCD protection. That's
partly what got me thinking about this issue.

Jim