Help with RCD unit.
I have got a secondary CU for all of my out door wiring, which I installed as a replacement for an old fusewire type distribution board
However, when I installed it, I didn't fit a RCD, and relied on plug in, earth leakage detectors.
A recient incident has decided me that I need something more sensitive, and faster, thus the RCD.
Having got the appropriate device, I am at a loss to install it.
Will it act as a direct replacement for a double pole breaker, or is the wiring more complex?
I cannot open the house CU, to check the wiring as it is a steel case, with a security lock, (part of the lease agreement) and I can only reach the switches.
What I actually want to do, is to divide the output from the CU, so that the circuits which need the extra protection, can come off the RCD, and some sensitive security equipment on an isolation transformer, which must not be switched off, can be left safely on, even when the RCD trips.