I am trying to install a GE 12723/ZW2004 Add-on Switch and GE 12724/ZW3005 Smart Switch and know that I need to pull some Neutral wires. Hoping the community could confirm my logic here before I start. These boxes are on a first floor and I have basement access below for stringing new Romex.
Based on the info from this GE 3-way FAQ, I believe the lights are wired like the 2nd “3-way Switch (Power into Light)” diagram:
Using this method (link), I have identified the box with the Load wire (call this “Box A,” like left box above) and the other box with the Line (call this “Box B,” like the right box above).
There is another circuit passing Box B through that DOES have a Neutral bundle, but I would like to avoid using its Neutral because it is not a lighting circuit and I do not want to start tripping breakers.
- Pull new 2-wire Romex to the Box A, effectively adding a Line and Neutral where there were none before
- Install the GE 12724/ZW3005 Smart Switch in Box A
- Still in Box A, wire nut (1) of the (2) travelers to the new Neutral (e.g. the taped white one in the diagram)
- Install the Add-on Switch into Box B, now that Neutral is being provided by an old traveler
As far as I can tell, this is equivalent to:
But physically, the right-most wirenut does not deliver Neutral to the light because it is connected in the ceiling at the light.
The only downside of this plan was that I wanted to use the Smart Switch in the other box because that side of the house already has the SmartThings v2 Hub, and I wanted to maximize the benefit of the repeater functionality. I believe I cannot put put the Smart Switch in the other box unless I pull a Neutral wire to each box.
Can anyone confirm that:
- The wiring plan above is sound
- I cannot put the Smart Switch in Box A unless I pull two new 2-wire Romex lines