I have two light switches that I am planning on replacing with smart switches.
As the diagram below shows, there are three "collections" of wires coming out of the wall, where each "collection" consists of one black wire, one ground wire and one neutral wire.
The neutral wires are currently not connected to the light switches, and all just feed into one wire nut.
Two of the black wires connect directly to a switch, and the third black wire connects to both switches via a wire nut.
The three ground wires get grouped together, and two of them go to a switch, and one doesn't appear to be used.
- Why are there only three black wires, and not four? I'd expect each switch to have two black wires, one load and one line.
- Why are there three ground wires if there are only two switches? Surely Only two ground wires are needed?
- Why are there only three neutral wires, and not four? I'd expect each switch to have two neutral wires, as this was the case when I wired up a single smart switch elsewhere in the house.
- When replacing the existing light switches with smart switches, I assume I should keep the ground and black wires as they currently are, but what should I do with the neutral wires, that my smart switch will require? Should I just put all 5 (3 existing ones, plus 2 short wires connected to the switches themselves) neutral wires in one wire nut, or should I do something different?
Thanks in advance!