i would like to install a humidity sensor switch into our existing bathroom fan set up which just has an on/off switch. i still want the on / off switch to work for the fan, but I also want the humidity sensor to turn on the fan if the humidity gets too high. currently there is only the 3 wires from the switch running to the fan etc.
do i need to run a wire from before the on / off switch (essentially bi-passing the switch) to the new humidity switch and then the wire from the humidity switch back into the wire that runs to the fan.
that way there is still only one wire taking power to the fan, but either of the switchs can turn on to allow the power to flow.
does that make sense?