-
One the one hand you can never have to many RCD's, on the other there can be an issue when you have more than one RCD that you don't know which one will operate. During the course I took the teacher was quite keen on only having one RCD in each circuit.
These days the regs all point to RCBO's or AFDD/RCD combined per circuit in the consumer unit. It's now unlikely that anyone will have combined circuits in a single RCD because the combined earth leakage would be too high.
AFDD - Arc Fault Detection Device
Airhead-
on the other there can be an issue when you have more than one RCD that you don't know which one will operate
I do remember you saying this but then it was a spark who was actually in my house so I'd rather blame someone who has been here rather than someone on the internet (not that I don't trust you, you've been a very helpful source of information). Also, all three times I've hired floor sanders (from two different places), they insist on also providing an RCD plug adapter without specifying it's only needed if your own house circuit is not already protected. That logic to me says "better safe than sorry", or "you'd rather have it an not need it, that need it and not have it", if that makes sense.
-
Never actually seen anyone install an AFDD though, a full RCBO/AFDD board is like £1800 lol.
And AFDDs don’t work on rings either!
stevo_com
Nef
That's exactly the set up I have, thankfully. The exterior socket was fitted by the electrician when we got our main CU replaced and the wire comes straight out of the wall into the back of it. When I swapped the socket for an RCD one (again, at the advice of a grown up), I didn't have to touch the back box or any of the wiring coming out of the wall. Same brand socket so was just a straight swap like an internal socket. Nobody really needs to know I did that.