DIYbanter - What rcd box for old wiring 30ma or 100ma asnd wherefrom?

George (dicegeorge) wrote:

In my house there's an old grey RCD box with no writing on it
which I cannot identify
which has been inserted before the old fuseboard
many years ago.

The test switch doesnt work but it does trip on faults.
It's very dusty from the old lime plaster above it.

So What to replace it with?

I guess a 100amp RCD box with 100ma trip current..
Or should I try a 30ma trip current one,
and be prepared for more trips?

I have a second 2007 consumer unit which powers a few sockets
which power my computers and electric heaters etc
so a trip on the old wiring circuit isnt that catastrophic..

(I've also bought a Wylex REC2S 100A 2 pole isolator (from Gil-lec). as
recomended here
which will go after or before the meter and before the old and new circuits)

Why do you want to replace one that works?

NT