Two Sets Of 3 Way Switches On One Circuit. - Electrical - DIY Chatroom Home Improvement Forum

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Old 09-20-2011, 03:32 PM   #1
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Two sets of 3 way switches on one circuit.


My name is Aron and I am in the process of finishing my basement. I am currently working on the electrical and I have a question regarding the wiring configuration for wiring two sets of three way switches.

Here is the scenario. I am running 12ga wire throughout to 20A circuits. The living room is approximately 17ft wide by 28ft long and the wife bless her soul, has her heart set on 15 can lights.

So I was thinking a three way switch to work them all. One on each end of the room. I could do that, I have a wiring book and am fairly confident. The wrench in my plan is she wants three rows of the lights to work with one set of switches and the remaining two to work with the other. My first thought was to run the configuration I am comfortable with to two different circuits, but I believe this will be wasteful and Arc fault breakers for future bedrooms are going to eat up my available space.


Can someone help me with how I would make mama happy and only use up one circuit. I have plenty of 12-3 and 12-2 wire.

Thanks in advance.


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Old 09-20-2011, 04:17 PM   #2
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1 Power 12/2 to first set of switches. 2 12/3 cables to other set of switches. 1 12/2 to each set of lights.


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Old 09-21-2011, 06:34 AM   #3
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think you have that backwards. Power is coming through the switch and then into 9 lights. I assume the next three lights are on the next switch. With this setup, you have to turn on the 9 lights just to turn on the 3 lights. Correct?
14-2 will do just fine, you only need a few inches of wire to make the necessary pigtails in the J-box.

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Old 09-21-2011, 09:24 AM   #4
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It is as simple as creating two switch setups and using the same power source. There is no need use two circuits for these lights. If you can wire up one all the light then simply wire up six of them with that setup and then copy it for the other three. Use the same p ower source for both of them by pigtailing two black wires to the incoming power for connection the the two switches.
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