This is because many include a run on capability that is triggered by the operation of the light switch and it is not permitted to have a device powered from two separate circuits.
Light switch for light and extractor fan.
If the fan is operated by a manual switch then one has to make a conscious decision to operate that switch.
3 push switch plus lights.
Connect the black fan cable together with the black light wire and the black switch wire and.
Locate the switch cable which must be glued through the top or side of the box that serves the fan or the light.
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Extractor fans in bathrooms are frequently powered from a lighting circuit.
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Connect a light and a fan to a new switch.
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