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Electrical Wire and Cable

Bathroom Light Fixture Wiring

By Dave Rongey - Summary:

How to Connect Light Fixture Wiring: How to Determine the Cause of a Tripping Circuit Breaker for a Bathroom Light, Light Fixture Wiring Connections, Bathroom Light Fixture Wire Size.

Guide to Light Fixture Wiring Connections

Electrical Question: I am installing a light fixture in the bathroom and the light fixture contains a white wire, a black wire and a yellow/green wire.

This electrical wiring question came from: Nadia, a Homeowner from Canada

Dave’s Reply:
Thanks for your electrical wiring question Nadia.

How to Connect Light Fixture Wiring

Skill Level: Beginner to Intermediate.
Tools Required: Basic Electricians Pouch Hand Tools, a non-aluminum ladder and Voltage Tester.
Estimated Time: Depends on personal level experience, ability to work with tools and access to the light fixture(s).
Precaution: Identify the lighting circuit, turn it OFF and  Tag it with a Note before working with the wiring.
Notice: Installing additional fixture wiring should be done with a permit and be inspected.

How to Determine the Cause of a Tripping Circuit Breaker for a Bathroom Light

A Direct Short condition which will cause a circuit breaker to trip may be caused by:

NOTE: An overloaded circuit may also cause a circuit breaker to trip as well.

IMPORTANT: If you are tripping the main breaker then please call an electrician for help.

Light Fixture Wiring Connections

The following connections are typical for 120 volt light fixtures and wiring diagrams may be reviewed for further understanding.

Additional Electrical Question about Bathroom Electrical Wiring

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This wiring diagram and pictures explain the basic bathroom electrical code wiring requirements required for most new or remodel projects. Give your bathroom a face lift when you enhance the electrical devices that will bring out the best in you. Make your eyes sparkle with get a breath of fresh air when you install one of these smart upgrades.

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FAQs Frequently Asked Questions and Comments

2 Responses to “Bathroom Light Fixture Wiring”
  1. Dave Rongey says:

    Dave, without seeing your bathroom setup, here are some possibilities of where the extra black wire goes:
    Another light fixture – recessed shower light.
    Ceiling Exhaust fan

    Basically, if this extra black wire was attached with the other black wires then there was something else that was being controlled by the bathroom light switch, and that is what the extra black wire is for and why it was attached with the other black wire.

  2. Dave Kidder says:

    I am replacing a 3 light fixture in my bathroom, when I took the old one down I did not notice an extra black wire about 2 inches long, it was attached to the other black wires but I am not sure where it should go. Without seeing this can you help?