Here is the screenshot of a Leviton 3 way smart switch (primary and secondary remote switch) wiring diagram.
For non-smart 3 way switch wiring, it is just mechanical connections in the switch which closes and opens path when we turn on and off switch manually. I understand how current flows.
But when it comes to smart 3 way switches, I am trying to understand how communication happens between both switches and how current flows through traveler wires. I am basically trying to understand where smartness comes from.
- Do smart switches have internal logic circuits?
- Can 3-way smart switches be operated if Wi-Fi is down - just like manual 3 way switches? If yes, how does current flow in the 4 different states of both switches (on/on, off/off, on/off and off/on)
- Is the wire in the diagram which connects YL/RD always hot?
- The red wire from the main switch (on right side) is directly connected with the black wire of the load. How would this allow the lights to be controlled by both switches?