That's certainly what a lot of people believe, but I think it is, strictly speaking, a 'myth' - in that I don't think that Part F or the Building Regs (almost as short as Part P
) says any such thing. Approved Document F does say something like that - but that, of course, is not a regulation or 'requirement'.All I know really is that the building inspector wouldn't sign off until I had installed a fan in the windowless dark room that I had in the bungalow I builtThat's certainly what a lot of people believe, but I think it is, strictly speaking, a 'myth' - in that I don't think that Part F or the Building Regs (almost as short as Part P
I'm happy to be corrected but I didn't think forced ventilation in room without windows (other than high humidity rooms) came in very long ago - say 10 years, I almost feel I want to say 5 years but we all know about tempus fugit.
Well that is what happened back then. Did different areas building control depts. have different regs.?. I thought they were a national thing rather than local govt. even over 30 years ago.
Yes, I was reading the Approved Document not the law, which said if you have windows which did not open, then you must be able to use the fan in a bathroom without switching on the lights, in fact it did not say the fan had to be connected to the lights in any way.That's certainly what a lot of people believe, but I think it is, strictly speaking, a 'myth' - in that I don't think that Part F or the Building Regs (almost as short as Part P
I think it matters quite a lot that people should not be given the impression that there is a legal requirement to do something when that it not true.
The law is not a myth, but there are myths in relation to what the law actually says.
... I would say only very occasionally (despite the past discussions here about it). I don't think I've personally ever come across it.
I think the only time I've come across DP switches on light switches for fans has been for multiple rooms sharing a single in-line fan.
I still can't work out why for a single room unless the light and fan are on different circuits/phases etc.
I think that the suggestion (as proposed/discussed by BAS in the distant past) is that a DP switch would allow both light and fan to be switched on simultaneously (each using one of the poles) but, because there was thereby no connection between light and fan, if the light (hence fan) was 'off', one could switch on the fan (but NOT the light) by a separate switch/timer module/whatever.
Because if a SP switch were used to switch on both light and fan, the feeds to both lights and fan would obviously have to be connected together on the load side of the switch - and that 'connected together' would mean that nothing would be able to turn on the fan without also turning on the light.
Yes, that would also work.
Provided only that the fan switch was break-before-make, would you actually even need a DP switch if the light and fan were on different circuits/phases?
Possibly not, however I'd be inclined to do it that way.
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