I have been adding Z-Wave Light Switch light switches to my house bit by bit. For the most part, they haven't given me too much trouble. Now I have come across a light that can be controlled in 3 different places. Also one switch is at the bottom of the stairs on a 2-gang switch where one switch is on one breaker (downstairs lights) and the switch I am working on is on another breaker (upstairs lights). All 3 locations have a neutral wire.

My first question, is does it matter that the gang box is on 2 circuits--particularly, is the neutral the same for both breakers? Second, the instructions say it matters where the switch goes, so how do I determine where each switch is in the sequence?

  • Can you post photos of the insides of the boxes? Also, is it the downstairs light or the upstairs light that's on multi-way control? Oct 20, 2017 at 22:18
  • No, the neutral is NOT the same for both breakers. Each neutral must be rigorously kept with its hot. You cannot steal a neutral from circuit 2 to power a smartswitch on circuit 1, no matter how much you may want to. Oct 20, 2017 at 23:28
  • For what it's worth, I gave up and hired an electrician. He thought he was coming in for a 10 minute job, but it took him 2 hours.
    – Andrew
    Nov 20, 2017 at 14:15


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