How to find a non-switched wire in attic

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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 ?

Best 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.