Here is light 1 box. The browns from Switch Box 2 go through light 1 and light 2 boxes and into Switch Box 3.
I’ve simplified the wires from endpoint labels to wire labels:
I was thinking of putting the master in Switch Box 2 using option 1 in my diagram above. Here’s my thinking:
• Switch Box 1 - tie red line (0L) to a brown traveller from Switch 2 (1L).
- at Switch box 2 test which brown line is now hot:
• Switch Box 2 - tie now hot line brown (1L) from Switch Box 1 into line master switch.
• Line (2L) from Switch Box 2 continues through light 1 and light 2 boxes to switch box three and tie into yellow load (3L).
• Switch Box 1 - use other brown traveller (1T) and use as traveller to master Switch Box 2.
• Switch Box 2 - use brown traveller (2T) through Light 1 and Light 2 boxes to Switch Box 3.
• Switch 1 - Run a new white neutral (1N) from Switch box 2 (cut in from bypassing white neutral in that box). 45’ length between boxes.
• Switch 2 - Tie in new new white neutral (2N) from cut in previous step from this box.
• Switch 3 - Tie in new white neutral (3N) from this box.
Neutral question… do they have to be on the same circuit? They don’t have separate circuits as they are all tied into together in one giant bar in the breaker box? But does that slow down the communication?
I could always run new neutrals from light 1 to stitch 2 then switch 1. I know the neutrals in switch box 3 and light 2 are the same.
Thanks again! Have a great week.