Bath Exhaust Fan Wire Connections
How do I wire the wall switch wires for my bathroom exhaust fan wires? How to Connect the Wires of a Bath Exhaust Fan, Wiring Connections for an Exhaust Fan.
Guide to Wiring Connections for a Bath Exhaust Fan
- I am installing an exhaust fan in my bathroom.
- One black and white wire is coming from panel and other one coming from the on and off switch.
- Please guide me how to connect these wire to the fan.
- The fan is simple with black and white wire.
This electrical wiring question came from: Ram, a Homeowner from Toronto, Canada.
Additional Comments: Very informative.
Thanks for your electrical wiring question Ram.
How to Connect the Wires of a Bath Exhaust Fan
Application: Wiring a Bath Exhaust Fan.
Skill Level: Beginner to Intermediate – Best performed by a Licensed Electrician.
Tools Required: Basic Electricians Pouch Hand Tools and Voltage Tester.
Estimated Time: Depends on personal level experience and ability to work with tools.
Precaution: Identify the bathroom light circuit, turn it OFF and Tag it with a Note before working with the wiring.
Wiring Connections for an Exhaust Fan
- Overview of Wiring
- Wiring switched power for a bathroom exhaust fan is basically the same as wiring a light switch.
- This example describes the wiring connections where the power source and the exhaust fan wires are located in the wall switch box.
- Identify the Power Source and Exhaust Fan Wires
- Identify the cable which supplies the wires from the circuit power source. This is typically a 2-wire cable with a black and white wire and a ground wire.
- A careful test using a non-contact tester of the black wire will indicate the power source.
- Splicing the White Neutral Wires
- Neural wires are not attached to the switch, but are spliced together.Sometime white wires are attached to a switch, however that is because the white wire is being used as a switched leg of the power wiring.
- The white neutral wire of the power source and the exhaust fan are spliced together using a yellow or red wire connector.
- Wiring the Switch
- A single pole switch is not polarized, so it does not matter which of the black wires are placed on the two brass screws of the switch.
- Strip off the insulating about an inch from the end of each of the black wires of the power source and the exhaust fan.
- Attach each of the black wires to the brass terminal screws on the side of the switch so the loop of the wire will be facing in a clockwise orientation with the wire loop directly under the head of the screw.
- Using a flat blade screwdriver tighten each screw down firmly to create a solid connection.
- Grounding the Components
- The circuit ground wires are the most important wires of the circuit because they protect the circuit components in the case of circuit overload or short circuit conditions.
- Ground wires are spliced together and bonded to the switch and to metallic switch boxes, as well as the device, which in this case is the exhaust fan.
- The bonding process of the ground wire of the circuit involves attaching a lead of the ground wires to a green grounding screw on the frame of the switch, a green grounding screw of the switch box and the exhaust fan enclosure. Some exhaust fans will supply a prewired bonded green ground wire which is used for the connection with the ground wire.
- Wiring the Exhaust Fan
- A typical exhaust fan will have a set of wires located inside the junction box which is located a part of the exhaust fan enclosure.
- The entry hole for the cable to be connected to the exhaust fan must be fitted with a cable connector which will insulated and protect the cable. This can be either a 2-screw connector, or a plastic insulated cable connector.
- Strip off the insulating about an inch from the end of each of the black wire of the cable at the exhaust fan.
- Create a splice for each pair of wires, color to color, and complete each splice using a yellow or red wire connector which is fastened firmly to create a secure splice.
More about Wiring a Bathroom Exhaust Fan
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