I have a switch box that has two 3 ways to control two different sets of lights 1 set in the hallway and 1 set in the living room and both of these sets have their own 3 way switch located in different locations but connected by 14/3 wire the power and both sets of lights are brought into the same box all with 14/2 wire.

The problem is I believe I have the wires crossed as when I turn the lights off at either of the different 3-way locations I have no control at the original switch box where the power and lighting wire is located.

How do I supply power to both 3-way circuits from the single power source?

  • Similar: diy.stackexchange.com/questions/31531/…
    – isherwood
    Commented Aug 7, 2017 at 18:34
  • Please use the edit link underneath your post if you want to update it with new information.
    – Niall C.
    Commented Aug 8, 2017 at 20:24
  • Were these circuits working originally, and if so what did you change? Please post a photograph of the wiring in the junction box, with the various wires labelled.
    – Niall C.
    Commented Aug 8, 2017 at 20:29

1 Answer 1


Here's a typical three-way switch with power to the switch box:

enter image description here

You'll do just that. With the second circuit, the neutral (white) simply nuts with the others.

For the hots (black), add two pigtails to the source hot and run one to each switch, just as you normally would. Easy peasy.

  • 1
    +1 But note that the white wire running from the lamp box to the right-hand switch is also hot at times and should be marked black with tape or a marker.
    – bib
    Commented Aug 7, 2017 at 18:56
  • I do not know if that kind of cable is available but here in Europe we use blue as common up to the lamp. Brown supply to the common on the left hand switch. Two black from the left hand switch to the right hand switch and one black from the right hand common to the lamp. Black on Brown is incoming hot. Black is possible live. and Blue is always neutral.
    – Decapod
    Commented Aug 7, 2017 at 21:22

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