How to find a non-switched wire in attic

Question

I'm trying to add a whole house fan in the attic.

Currently there are many power cables in the attic and as far as I know, they all feed lights and bathroom fans - implying they are all switched.

To connect the fan, I think I need a non-switched wire that I can tap into.

Will my search for a non-switched wire in the attic prove to be futile ?

Any tips on how to find one ?

mfarver · Answer

You should check the instructions for the fan, but I suspect it draws too much current to simply be tapped into an existing circuit. It may be best to hire an electrician to bring a new circuit from the panel to the fan location.

Answered by mfarver on November 27, 2020

Jasen · Answer

Look for a light fitting where there are two or more cables going to it and it is the only light on that switch. - there will be a live and a neutral in that box.

Else fish a second cable down to an existing light switch that feeds a light fitting  that only has one cable there will be an always hot and a neutral in there (so long as it's not a  multi-way switch)

How to find a non-switched wire in attic

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