The Economy 7 supply to our house goes through a small box with a built-in isolating switch and space for a single MCB[1]. Presumably if I can find a 20A RCBO of the same width and shape I can just substitute this for the MCB. But if such a thing does not exist, would it be OK to use a two pole RCBO mounted alone in a small box with no separate isolating switch? Space is not very ample.
[1] It is probably a bit dubious now as it serves a single 'radial' circuit which branches to two sockets (that I have found) and is wired in 2.5mm^2 cable bundled with other cables and supplied through a 32A MCB.- posted
5 years ago