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commercial shower room lightting

Former Community Member
Former Community Member
I been asked to install new lights into 2 newly formed shower / changing rooms within an existing office floor which is being refurbished. Current set up is lighting busbar in ceiling void, LCMs plugged into busbar which then distribute to light fittings

Question is that the new shower room requires 30mA RCD protection, I've asked the designer to provide details of how to provide this protection  but not yet had an answer. Lighting controls company also ignoring the issue. 

Is protecting the whole busbar which may have several LCMs and tens of lights hanging off it a good idea, whole floor will have new LED modular lights fitted. Can I simply divert the LCM supply from the busbar through a 13 RCD FCU and make sure that only the fittings for the showerroom come off this LCM. I do realise that there is some issue in BS7671 not recognising RCD FCUs.

Would welcome any ideas or comments. 

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  • 0
    if you do not like a fused spur RCD, then you could have a plastic box with an RCD or RCBO in it in line.

    What sort of fuse or breaker protects the whole circuit - is it practical to assess the earth leakage- a clamp meter round L an N will show how much is not coming back the way it should.. - an RCBO or RC for the whole circuit is probably easiest, but only if the back ground cpc current is low enough it does not nuisance trip.
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  • 0
    if you do not like a fused spur RCD, then you could have a plastic box with an RCD or RCBO in it in line.

    What sort of fuse or breaker protects the whole circuit - is it practical to assess the earth leakage- a clamp meter round L an N will show how much is not coming back the way it should.. - an RCBO or RC for the whole circuit is probably easiest, but only if the back ground cpc current is low enough it does not nuisance trip.
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