Diagram Wiring Double Switch Bathroom Fan Light. The wall switch box and wiring are already installed and worked with old fan. It can also be adapted for separate switching if required. A bathroom extractor fan is essential to clear the room of humidity and prevent damp.
The common on the second 3 way switch is connected to the hot wires on the fan light. For example you might want to turn on a bathroom light separately from the ceiling fan. The time lag switch will allow the fan to be manually started but then run for a pre set time. Switch wiring for bath fan and light electrical question.
3 way fan switch wiring diagram.
To wire a 3 way switch circuit that controls both the fan and the light use this diagram. Options include a manual pull switch and a vacuum time lag switch. I have a new bathroom exhaust fan heater light to install in place of an old one and wire the switches. I also had a fan heater light. The common on the second 3 way switch is connected to the hot wires on the fan light.