How Do You Wire 2 Light Switches And From 1 Power Source?


8 Answers

Rev. Dr. Charles Rogers Profile
First it is necessary that you understand (and identify) the switched conductor coming into the box. Confusion arises when you have a switched conductor for the light and a switched conductor for the fan being the same color (usually black) come into the box unidentified. You will need to identify both and ensure that they do not connect to any other devices as you begin.
Normally, combination devices such as ceiling fans with lights are wired with separate control wires colored black and blue, with black usually being the control wire (or power source) for the fan and the blue being for the light.
When wiring a combination fan/light with each being switched separately, you would have the switched conductor, neutral, and ground for each coming into the box. NOTE - you cannot use a common neutral unless you have two separate circuits originating in your panelbox which have the circuit breakers installed on different phases (i.e. Breakers installed at spaces 1 & 3, 2 & 4, etc.) You need to understand that the breakers installed directly across from one another are on the same phase (A); the next two will be on Phase B; and then the cycle will repeat. This is standard for all residential electrical.
Even when you have multiple fan/light units to connect together, you would connect the black to the black for the fans, the switched lighting conductor to the blue, all of the white together, and then the bare copper grounds together.
I would advise a trip down to the library to study on your particular installation, or to a local lumber or hardware store to pick up a book on basic electrical for residential installations.  Sorry - I got off track. The answer to your original question is yes. And I must say, in regards to the first answer that you got, I have never heard of a splitter (and I'm an electrical engineer.)  What you have to have is 2 three way switches and 3 conductor cable with a separate ground. The easiest method of installation is to wire power through the three-way switches and then to the fixture.  Take a look at the picture I've uploaded and it will clear up a lot. You can also go to the website in the picture for further study before beginning. Wiring three-way switches can be tricky. Good Luck.
thanked the writer.
Anonymous commented
found the answer on another it is and it works

Proper way to find the switch leg is use a continuity tester. With the power off and the fan switch on and the closet light off pick a cable and test for continuity between the black and white wire. If you find continuity then turn the fan switch off and test again for continuity. If the continuity turns on and off by that fan switch with your tester then you have the switch leg. Repeat the test with each cable till you find the cable that loses continuity when the switch is off and gains continuity with your tester when the switch is in the on position. Then once you find the switch leg jump down to the last paragraph to wire up your fan.

If you only have a voltage tester then leaving the fan disconnected and all the white wires disconnected wire nut all black wires together. Turn your fan switch to the on position and use your voltage tester testing from each white wire to the bare wires all wire nutted together with the breaker on. The white wire that reads hot will be your switch leg. ONce you have identified the switch leg the jump to the bottom paragraph of this reply to wire up you fan.

Fastest way to find the switch leg is to leave the black and white wire from one cable not wired together. Just bend that black and white of that one cable back out of the way. Leave the fan out of the picture at this time. Wire nut the remaining two black wires together with a wire nut not connecting the fan. Wire nut the remaing two white wires together with a wire nut not connecting the fan. Energize the circuit and turn on your fan switch. If the breaker trips then one of hte two cables wire nutted together is your fan switch wire.

Then you are down to a 50 / 50 choice.

If you turn on the fan switch and nothing happened then try your closet light. If it works you picked the cable going to the switch right off the bat being the bent back unused cable.

If you fan switch tripped the breaker then disconnect one of the two wire nutted cable and bend that cable back and connect the cable you left out the first time in black to black white to white and test again.

If the breaker still trips when you turn on the fan swtich then the wire that was wire nutted both times is your switch leg. If the breaker does not trip with the fan switch and the closet light works then the second wire you bent back is the switch leg.

Once you identify the swtich leg then connect the black of the other two cables and the white of the switch leg together and fold into the box. Then wire nut the two remaining white wires together with the white wire of the fan. Then connect the black wire of hte switch leg to the black wire of the fan.

You should have a working wiring system.
Larry Patterson Profile
Larry Patterson answered
One way is to run power (hot neutral and ground) to each light. Hook the neutral and ground up. Then run a switch leg to each switch, using the same 14/2 or 12/2 type wire. Hook one wire to the light and the other wire to the hot feed installed in step 1. On the switch end, hook the black to one crew on the switch and the white to the other. Finish by hooking the ground to the green scree on the switch.
Depending on where you plan to ap into existing power, it might be easier to run the power to the switch first, making the power go through the switch in order to get to the light.
Anonymous Profile
Anonymous answered
Send the power to the other switch on the white as the common. The white wire can only be a neutral or a constant hot. The sw leg remains at the power source. If you send the sw leg to the other end, you are technically switching the white as either one of the travelers or the common.
thanked the writer.
Adam Haney
Adam Haney commented
The red wire is to carry the power, what is advantage of turning the white into the hot wire?
Rev. Dr. Charles Rogers Profile
The only thing that the first answer was missing was to tell you that you will need two 3-way switches. 3-Way switches are designed and equipped with an additional terminal to which you attach the third wire (the traveler).
Correction - As I read the previous answer I notice that the conductors you need are wrong. You need a three wire conductor with ground for wiring the lights as you want to.
Take a look at the diagram that I have uploaded....
Anonymous Profile
Anonymous answered
I want to install a light in my hallway. Can I run a line from a receptacle to my light and then to a switch?
Adam Haney Profile
Adam Haney answered
I am installing four dimmer switches, two in one box then two in another box on the other side of the room.  The switches will control to pods of pot lights (lighting different parts of the room).  The power source will be one wire coming into the first box, powering the first two dimmer switches.  I have 14/3 going from the first box to the second box.  The switches have and on/off toggle at the bottom of the dimmer slid.  Do you have a diagram/picture to show the correct wiring?
Chips Ters Profile
Chips Ters answered

Cable testers save a lot of time when testing twisted pair (with RJ45, RJ11, RJ22 connectors) and coaxial cable. They make it possible to determine the integrity of the conductors, the correct installation of the connectors and the presence of damage. Today, manufacturers offer such a wide range of multifunction cable tester that choosing the right device is not an easy task even for an experienced engineer.

Larry Patterson Profile
Larry Patterson answered
If they are 3 ways, like this.,DLUS:2007-46,DLUS:en

If single poles in the same box, connect the incoming hot to two short pigtails, one goes to each switch.

If they are in diff boxes, bring the hot to one box, make a pigtail to the switch and connect the wire going to the other box to the hot wire (one wirenut with two wires).

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