How to Wire a Bath Exhaust Fan and Light


By Dave Rongey - Summary:

Installing and Wiring a Bath Exhaust Fan and Light: Power Sources for a Bath Exhaust Fan and Light, Power From a GFCI Outlet, Junction Box Wiring.


Guide to Installing and Wiring a Bath Exhaust Fan and Light

Electrical Question: After my bathroom addition was rough wired and before the insulation was done I decided to add a ceiling fan and light to be controlled with separate switches in place of a simple light fixture.

What can I do?

This home electrical repairs question came from: Mike, from Darke County , Ohio.

Dave’s Reply:
Thanks for your electrical troubleshooting question Mike.

Application: Wiring a Bath Exhaust Fan.
Skill Level: Intermediate to Advanced – Best performed by a Licensed Electrician.
Tools Required: Electricians Pouch of Hand Tools for Rough-In Wiring, Electric Drill and Auger Bits and Extension Cord.
Estimated Time: Depends on the extent of the bathroom remodel project, the type of construction and available access to the project area.
Precaution: Any existing wiring in the immediate area that may interfere with the installation of new construction materials should be identified, turned OFF and Tagged.
Notice: Modifying existing wiring or installing additional bathroom electrical wiring should be done according to local and national electrical codes with a permit and be inspected.

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Be Careful and Be Safe - Never Work on Energized Circuits!
Consult your Local Building Department about Permits and Inspections for all projects.

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FAQs Frequently Asked Questions and Comments

4 Responses to “How to Wire a Bath Exhaust Fan and Light”
  1. Dave Rongey says:

    GFCI Protection for a Bath Exhaust Fax

    Hi Gary,
    To provide GFCI protection for an exhaust fan the incoming circuit power connects to the Line side of the GFCI outlet, then the wires for the exhaust fan connect to the Load side of the GFCI outlet. The switches for the exhaust fan and light are installed on the Load side wiring as well.
    Dave

  2. Gary says:

    Wiring a Broan QT140 LE Exhaust Fan

    I have a Broan QT140 LE that I want to put above a shower. It says I need to have it on a GFCI circuit since it will be in a shower. Can I bring the load (power) into the dual wall box and into the load side of GFCI OUTLET and than out (line out in GFCI) to the switch for the fan/light?

  3. Dave Rongey says:

    Hi Vincent,
    Circuit Wiring for a Bathroom
    Check the wiring to the GFCI outlet, specifically wiring to the LINE and LOAD terminals. If the wiring is backwards the the GFCI will not have power at the outlet.
    Identify all of the wiring, both hots and neutrals. Create a diagram if needed, but understand that the wiring connections of the GFCI must be correct.
    I hope this helps,
    Dave

  4. Vincent Key says:

    I am trying to wire a bathroom. I have power, light, and switch wires coming into the junction box with power going to the switch connected to the vent fan switch and GFCI outlet, and a connection going to another outlet. I have power to light also to vent fan, but not to the GFCI. What could be the problem? When I remove the GFCI and wire the wires together I have a completed circuit.