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I have two 3-gang boxes (with 3-way switches) to control 3 sets of lights within our kitchen. Since there are two entrances to the kitchen, I have a box at each door. My main question is how to connect the two boxes together. Do I use 3 runs of 14/3 or a combination of 14/3 and 14/2. Here is my schematic if anyone can help.

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Basically you need three 14/3 cables between the two boxes. Wire each pair as a set of 3-way switches.

Here is a basic diagram. Just do this for each set of 3-ways. The only difference is that you will need to pigtail three leads onto the incoming feed wire to feed each switch in the first box, and splice all the white wires together since they are all sharing the same circuit. At the box with the switch legs you will splice each white to it's corresponding white going to the lights. enter image description here

  • be sure to calculate the proper sized gang box! – simpleuser Dec 23 '15 at 23:11

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