RCD Protection In A Bathroom Lighting Circuit

[SFT223]

Hi Guys,

I know this subject has probably been covered before, but I need some advice on introducing RCD protection into a 240v bathroom lighting circuit. The lighting will consist of one main bathroom light and a shower light, linked to an extract fan fitted with a timer.

There is a very good representation of the overall circuit diagram here:- DIY and Home Improvement Wiki - Electrics - Lighting - Fan

I am aware that the RCD connection unit needs to be fitted on the supply side of the circuit in question, so do I just introduce the RCD into the supply cable going to the ceiling rose, or am I better to install a 3 terminal junction box to simply 'break into' the lighting loop and run a spur off. So that the RCD is only working with the bathroom circuit?

Thanks for your help on this.

Steve

PS I know all about the various zones within the bathroom, and that any work is notifiable to local building control under part P of regulations, etc. * I use an authorised person to check and sign off my work, as required.

 

[telectrix]

it's a matter of choice whether you RCD just the bathroom or the whole circuit, or go a step further and RCD all circuits. e.g. with a new CU either dual RCD or RCBOs. all depends on the customer#s budget and how far he wants to go.

 

[Guest 004]

Single RCBO, job done in 15 minutes

 

[BES]

I take it you have checked that you dont require supplementry bonding even being protected by a rcd circuits in rooms contaning a bath or shower have to meet certain requirments before it can be omited and most fans manufactures instructions require it to be fused down to 3 amps.

 

[Paul.M]

DIYer question. Needs to be moved imho.

 

[telectrix]

Single RCBO, job done in 15 minutes

in an old wylex 3036 board??? a crowbar and hammer come into mind.

 

[Guest 004]

Haha .....

 

[Guest 004]

If that's the case single enclosure with rcbo fitted next to board

 

[Guest 004]

If still no room, back to plan A, crowbar and hammer

 

[Paul.M]

To the Op (opening post/poster):-

You say you are going to get an electrician in to test, cert and notify this job of yours. It wont cost much more for him to do the job from start to finish. And a very good point of bonding was asked, this is something beyond a DIYer I'm afraid.

 

[Sintra]

It's a lot like your previous thread http://www.electriciansforums.co.uk...ions/83954-rcd-protection-units-en-suite.html

 

[Paul.M]

^^^^ After reading that the answer is = Get an electrician in Steve (op).

There will be a spark or 3 on here in the Wigan area. Get the job done correctly and for the safety of your family. I know its almost Christmas but this wont cost a lot. Get it done right mate.

 

[SFT223]

Oh Dear!

DIYer question. Needs to be moved imho.

Thanks a lot, very helpful . This and your other informative replies bring to mind the woman in the various David Walliams and Matt Lucas sketches, who just keeps repeating 'computer says no' :banghead:. Suggest you get out more!

Steve

 

[SFT223]

it's a matter of choice whether you RCD just the bathroom or the whole circuit, or go a step further and RCD all circuits. e.g. with a new CU either dual RCD or RCBOs. all depends on the customer#s budget and how far he wants to go.

Yes you're right of course telectrix, but budget tight and he doesn't want me to disturb anything else in system. In my original post, I should have stated that it was a local RCD unit that I was going to install, like this 13A 30mA Double Pole Passive RCD Connection Unit | Screwfix.com

This is why I referred to the 'unprotected' circuit diagram as a starting point for my installation.

*I can't fit RCBO's as the original board isn't compatible and to fit a new enclosure (for the bathroom circuit only) would involve far too much work, which the client isn't prepared to pay for. So this is why I settled on the local RCD as a practical and cost effective solution.