I’d really like to add Z-wave or Zigbee switches to my ST setup. I’ve found one switch box that has a bundle of white neutral wires in it, but most of the junction boxes in my apartment don’t. Then there’s this one:
This single gang box has a switch to a ceiling light. I know that the two white wires connected to the switch are line and load (the wire on the left has 120V when the circuit is on, the wire on the right has 0V), and the red wire is a traveler to a switch at the other end of the room that also controls the ceiling light.
Can anyone help me figure out what the two black wires in the back connected by a wire nut might be?