Switched live for fan - connect to shower isolation switch?

One More Solo

One More Solo

One More Solo

Soldato
Joined
29 Dec 2004
Posts
17,109
Location
Shepley
Is there any reason why I can't move the switched live for my bathroom extractor fan to the shower isolation switch rather than the light switch? I don't see the need for the fan to be on when the room is not subject to steam/humidity. The fan has its own in-line isolation switch currently and both the other switches are outside the room so not notifiable as far as I know.
 
A few reasons to not do it.. supplies from different circuits, possibly running into "borrowed neutral" and most importantly the shower will be protected by a large MCB (usually 40A+ these days) which would be protecting the switched live cable to your fan which certainly wont be able to take 40A+.

Your bathroom fan should have a fan isolator switch inline with it that you can use to turn the fan off when not needed, assuming its been fitted correctly.
 
As per the above post for why you shouldn't do as you suggest.

If you wanted to achieve this functionally, then you could feed a contactor off the shower isolator via suitable fuse/breaker and use this as a set of contacts to control the triggger line to the fan.

Or put a flow switch on the shower pipework for the trigger line.

Or swap the fan for a humistat one
 
I am putting in a separate switch for my inline shower fan as we feel no need for it to come on with the light when the shower is not being used.
 
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