Bathroom Mirror Light

[scottb]

I have a new bathroom mirror light and have to run a spur to the bathroom light of the existing lighting circuit.

The lighting system is protected by the main CU 63A 30ma RCD breaker.

The question is, do I have to run the bathroom mirror light via a rcd fcu or will the CU breaker be ok

I am aware of Part P but would still like to do this myself.

Thanks

 

[Adam_151]

No need to have another RCD in line, they won't discriminate, seems a bit odd that the lighting circuit is on RCD though

 

[breezer]

No need to have another RCD in line, they won't discriminate, seems a bit odd that the lighting circuit is on RCD though

perhaps he assumes it is protected by the rcd, may not be a split load cu.

incedntaly i have NOT got a split load cu

 

[scottb]

the cu is not a split load.

Would this be the same for my electric underfloor heating in the bathroom then...? i.e. I currently run the feed on its own breaker from the cu via an rcd - would there be no requirement for an seperate rcd if the cu was not a split load?

thanks

 

[Adam_151]

yes, no reason to have two RCDs of the same rating protecting the same thing.

RCDs with different ratings are sometimes used together to give varying degrees of protection to different things, like if I had a 100ma main switch, I might protect the socket near the back door with a 30ma rcd, as it needs 30ma protection, and everything else doesn't, though if I wanted to make sure these two RCDs would discriminate, I'd have to make sure the main switch RCD was time delayed - anyway, thats just a bit of background info