rcbo rcd confusion

[haddow]

Hi can someone please explain why some cu you see have 2 rcd with 9 mcb but then 1 seperate rcbo. Is the rcbo for like a freezer circuit?

Is there any advantage of having no rcd and just all circuits on rcbo?

Also why do some have double pole rcd?

Thanks very much

 

[Doc Hudson]

Welcome to the forum Haddow, discrimination -vs- costs is a big factor. if RCBO's were the same price as MCBs I doubt if anyone would use many dual RCD boards.

Doc H.

 

[haddow]

thank you for the answer. So if they were cheaper then all be rcbo so to stop one circuit tripping the others - ok got that thanks

 

[a1]

Our sponsor does very reasonably priced RCBOs, which aren't far off the price of an MCB.

 

[Doc Hudson]

It pivots around that regulation about reducing inconvenience due to a single fault.

Doc H.

 

[NozSpark]

Or it could be that someone has added a new circuit and wants to keep their circuit separate to an existing "dodgy" installation

 

[Ali]

I don't mind having a dual RCD board in my house because provided I always have some sockets or lights, things are OK. But if I was putting a new board into a house where someone was relying on a stair lift, I'd really want it on its own RCBO (of at least the ring it is off on it's own RCBO ) so that any other fault in the rest of the house wouldn't leave anyone stranded upstairs.

It's all about looking at the house, price and people using the board.