I have fitted a 12volt fan over the bath of my new house, it is in Zone 1 and the transformer is in the hall way, it is fed through an RCD supply, my NHBC inspector (in passing) said he was un-happy about this and said it would fail based on this. I have checked with Part P and it is fully compliant, is the Inspector being a proverbial pain (not the first time) and showing his inexperiance, or have I missed something? My next step is to contact the NHBC and ask them wether he is mistaken or wether I will have to move the fan.
12v Fan over Bath
- Thread starter leshark
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He is wrong. Your fan is OK in Zone 1 providing it has the required degree of protection from ingress of water. Check out http://www.niceic.org.uk/downloads/Pocket Guide 1.pdf
and suggest your guy looks at it too.
TTC
PS As this is a SELV appliance there was no need to have it conected to the RCD
and suggest your guy looks at it too.
TTC
PS As this is a SELV appliance there was no need to have it conected to the RCD
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Honesty being the best policy I have to admit failing my DIS assessment due to me fitting the incorrect extractor above a bath 
( maybe putting it on the RCD side in my case would have meant a pass ?? ) , but a LV fan installed as you describe is sound.
No need for the rcd yet !!!!
( till the 17th )
( maybe putting it on the RCD side in my case would have meant a pass ?? ) , but a LV fan installed as you describe is sound.No need for the rcd yet !!!!
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"Failure !" , "Failure" . I hear the cries !!!!! 
and what's this got to do with the price of fish?leshark said:
Or did you mean to say
"I have checked with the electrical regs and it is fully compliant."
Complying with part p is about WHO does the work and to what standard. Complying with the electrical regs is a different thing.
EddieCurrent said:
Even with an RCD you'd have failed and I do not beleive the 17th allows it either. I believe that the proposal is only for RCD-protected sockets - I wasn't aware that it extended to other appliances. Maybe wise owls who have the draft can illuminate. In any event right now its the 16th any other bets have to wait a 12-month.
TTC
The DPC for the 17th edition on the iee website suggests all circuits in a bathroom to be RCD protected (section 701)??
http://www.iee.org/Publish/WireRegs/DPC/DPC_Introduction.pdf.
http://www.iee.org/Publish/WireRegs/DPC/DPC_Introduction.pdf.
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To the OP: you should ask WHY it fails....
As long as it is IPX4 and RCD protected OR IPX4 & SELV, it complies.
You have sited the control gear outside the zones. I can't see a problem. Ask him...
The seventeenth is proposing to remove the requirement for supplementary, and replace it with provision that all circuits within the bathroom have RCD protection. As for socket outlets, they can be sited 3m from the boundary of zone 1. (From memory, please don't quote the distance)
As long as it is IPX4 and RCD protected OR IPX4 & SELV, it complies.
You have sited the control gear outside the zones. I can't see a problem. Ask him...
The seventeenth is proposing to remove the requirement for supplementary, and replace it with provision that all circuits within the bathroom have RCD protection. As for socket outlets, they can be sited 3m from the boundary of zone 1. (From memory, please don't quote the distance)
Roll on the 17th edition, supplementary bonding has always been overkill and sometimes unsightly.
German regs allow a socket in the bathroom but sensibly there is a minimum distance requirement from the bath. Makes our regs that allow a socket right outside the bathroom door, no matter how close, seem very foolish
German regs allow a socket in the bathroom but sensibly there is a minimum distance requirement from the bath. Makes our regs that allow a socket right outside the bathroom door, no matter how close, seem very foolish
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Without wanting to seem argumentative ( ), why?
), why?What's the point in RCD protecting a SELV circuit? In my humble opinion, it is a waste of money. If you RCD protect the feed then only the mains side of the tranny is protected, if you protect the outgoing then as it is electrically separate supply the RCD is pretty useless anyway.
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I take your point 123, that it is pointless, but that does not make it a no-no.
Nevertheless, 7671 (17th) may end up asking for RCD protection on all circuits within a bathroom. In which case, I think SELV fans will die out: as we agree, there is no point having both...
Nevertheless, 7671 (17th) may end up asking for RCD protection on all circuits within a bathroom. In which case, I think SELV fans will die out: as we agree, there is no point having both...
I think personally I prefer a SELV fan over an RCD protected mains one.
RCDs can (and do) fail. SELV will not.
Also would you not still get a bit of a shock before the RCD operates?
You wouldn't with SELV.
RCDs can (and do) fail. SELV will not.
Also would you not still get a bit of a shock before the RCD operates?
You wouldn't with SELV.
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