The Electrician's guide to the build " An extractor fan supplied from a lighting circuit for a bathroom without a window should have its own means of isolation, as otherwise replacement or maintenance of the fan would have to be carried out in the dark. An isolation switch for a fan with an overrun facility will need to be triple-pole (switch wire, line and neutral), and must be installed outside zones 0, 1 and 2"
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Thank you for the info. Was this written before head torches became widely available? Does this also mean ceiling fans should not be installed or maintained at night? What if the fan is not supplied from the lighting circuit and so on :-)
Then that is easy - use a plain DP isolator.
But it is a lot of old bollocks. They might as well say "DP isolator on every lighting room circuit in case you want to change a fitting at night, by the light of another fitting".
Boilers I can understand - gas fitters might be in those every year and would like to know the whole thing is dead.
or a 1 pole switch.
NT
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