December 4, 2011 By Dave Rongey ©2007-2012Author - Licensed Electrical Contractor Filed under Electrical, Occupancy Sensor Switch
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Installing a Occupancy Sensor Switch for a Bath Exhaust Fan |
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Question: I have bought a small extractor fan or exhaust fan which I want to install in my bathroom.
- I want to make it go on only when people enter the room so I bought a motion occupancy sensor.
Can you please explain how I should wire them.
Regards,
Emmanuel
Background: Emmanuel, a Handyman from Malta
Additional Comments: A very useful site. Keep up the good work!
Dave’s Reply:
Thanks for your electrical question Emmanuel.
Electrical Wiring for a Motion Occupancy Switch for a Bath Exhaust Fan
- The occupancy sensor or switch is typically installed in the switch box on the wall.
- The wiring is straight forward except that some of these occupancy sensor switches require a neutral wire for the 120 volt applications.
- The electrical wiring would be connected with the power source in and load out to the bathroom exhaust fan, a neutral wire if required and a ground wire.
- Below is one example of a occupancy motion sensor switch wiring diagram which should be helpful.
- Please read the complete installation instructions for your specific motion occupancy sensor switch for your bathroom exhaust fan.
I have provided the following links that lead to fully detailed information on this website that will assist you with your electrical question:
For more information about Bath Exhaust Fan
Bath Exhaust Fan
Bathroom Exhaust Fan
Answers to all of your questions about installing a bath exhaust fan and your bathroom exhaust fan replacement project.
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Consult your Local Building Department about Permits and Inspections for all projects.
For Best Results Consult a Licensed Electrical Contractor in Your Area
Doris,
Most occupancy sensors require a neutral wire to be at the switch box location. If your occupancy sensor requires a neutral connection then a neutral of the light that you want to control must be in the switch box. If there is not a neutral wire of the light circuit at the switch box then you may not be able to install the occupancy sensor.
Dave
We have a double switch in our bathroom–one for light and one for exhaust fan. We want to replace with a occupancy sensor for light and a timer for exhaust. What is confusing us is the neutral wire. How would we do this?
I have had an electrician install motion sensors in the powder room and bathrooms to control the exhaust fans. They do not work properly. At the maximum setting the fans do not turn off, at the minimum setting the fans do not always recognize that the rooms are occupied, between these settings the fans will kick on every so often when the rooms are not occupied. I believe the motion sensors are inferior or perhaps defective. Do you have a recommended motion sensor that mounts in the duplex receptacle box?