s the Isolator allowed by law to be mounted in the bathroom, or does it need to be mounted outside the bathroom?
Well, by law
you can put it almost anywhere you like in a private house, since there is nothing legally enforcable about BS7671.
However, as far as the Regs. are concerned it can go inside the bathroom, subject to being located outside the appropriate zones as for any other switch.
I wouldn't locate the isolator in the roof space unless the fan itself is mounted there (i.e. an "in line" unit with ducting to the grill over the tub/shower).
[This message has been edited by pauluk (edited 10-19-2005).]