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Pretty sure I had it (they light off).
I didn't switch off as the wife was in the middle of a TV show and I would have had to get a ladder to get to the fuse box... figured it would be fine... figured wrong.
chrisbmx116-
Extractors usually have a permanent live as well as a switched live (the light switch) so they can continue to run after the lights have been turned off. Did the chap who fitted it in the end add an isolation switch so it's an easier job next time? Not critical but I'm pretty sure that's in the regs now.
inchpincher
You might have had it switched on when tried to put the wires in? Hard to understand why anyone wouldn't switch the power off to the circuit they're working on.