Wiring 3 Way Switch With 12/2. Web if one connects the hot to the first common, the neutral goes up to the light on a 12/2, and the black conductor in that 12/2 isn't used. The travelers go to the second 3.
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There are many on the market. Web if one connects the hot to the first common, the neutral goes up to the light on a 12/2, and the black conductor in that 12/2 isn't used. 3 best way would be to use a 'smart' switch of some sort.