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?

What are you seeking to protect? If you want adequate protection from
electrocution then you need a 30mA device. A 100mA device is only really
designed to protect the installation ins situations where the earth loop
impedance is too high to reliable trip MCBs etc.

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..

You could also say, if the old wiring is leaky enough to trip a RCD then
it needs fixing anyway.



--
Cheers,

John.

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