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Kevin, Licensed Electrical Contractor
Category: Electrical
Satisfied Customers: 3724
Experience:  30 years Licensed Electrical Contractor in Illinois, Adjunct College Electrical Instructor, Former Electrical Inspector, Diploma: Digital Electronics, FCC Technician License
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for my bathroom exhaust. I have a wire from the exhaust. a

Customer Question

for my bathroom exhaust. I have a wire from the exhaust. a wire from the switch. and a wire from the panel. How do I wire that up in a junction box? This website has been pretty good to me. I'm sure you guys can help me out again. Thank you
Submitted: 4 years ago.
Category: Electrical
Expert:  Kevin replied 4 years ago. name is XXXXX XXXXX I will be happy to assist you with your electrical question. My goal is to exceed your expectations on Just Answer!


1) Does the bathroom exhaust fan also have a light or just a fan?


2) Is the wall switch a Single Pole switch where the fan can only be switched from 1 location? If the fan has a light, do you want the fan and light to be switched simultaneously or each on a separate switch?


3) What are the quantity and color of the wires on the fan and the switch?


4) What is the wiring scheme in the bathroom? Romex cable or EMT metal conduit?

Customer: replied 4 years ago.

fan has a light on its own switch. fan is only gonna have one switch right inside the door. with the three wires I have 3 blacks 3 whites and 3 copper


Expert:  Kevin replied 4 years ago.

1) Thank you for the replies.


2) Since the fan will be controlled by 1 Single Pole switch, you will need to determine the hot feed wire. The hot feed wire will also be a black wire. You will need to make a pigtail splice from the hot feed black that feeds the existing light switch and connect the pigtail splice to the bottom of the new fan exhaust switch. Most likely, the hot feed on the light switch will also be on the bottom screw terminal. If in doubt which wire is the hot feed, you may need to use a 2-prong AC voltage tester to determine. Let me know if you encounter any problems in identifying the hot feed and we can take it from there.


If you look at the orientation of the SP switch, the "ON" wording will be on the bottom portion of the switch. Splice your pigtail hot feed onto the bottom screw of the switch. The top screw of the switch will be your switched loop conductor and that will connect to the black of the exhaust fan. The white neutral wire does not get switched and will splice directly to the white neutral of the fan. Since you have Romex, splice your bare copper ground to the fan green ground wire.


3) Turn the circuit breaker to OFF prior to removing and/or making any splices or terminations.


Reply back to me if you have any problems...........Thanks..............Kevin!

Expert:  Kevin replied 4 years ago.

1) Here is a diagram to assist you. I apologize as I do not have a diagram showing a fan. Just omit the light bulb and this will be the fan portion. The wiring is the same. Notice how the white neutral wire does not get switched? Only the hot feed and the switched loop wire terminate on the SP switch.


Customer: replied 4 years ago.

got it! thank you sir

Expert:  Kevin replied 4 years ago.

1) Very good.




Hope this helps.........If you have any additional questions, let me know and I'll be glad to answer them for you.


Otherwise, don't forget to rate me before you log Off.

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