Shelly 1L/Dimmer in 3 Way Switch UK

[JiffyBoogle]

I am looking to install a Shelly 1L or a Dimmer with no neutral into a 3 way switch.

I’ve searched the internet and can’t seem to find clear diagrams on how to do this if an intermediate switch is involved.

This diagram is my current setup:

3-way-switching-schematic-wiring-diagram

Any any advice on where the shelly would go in this setup?

[KruseLuds]

This is the way.

2-way switches - “Hotel type”

I have done this and it is a little tricky. I did ALOT of research on it and carefully saved what I learned as it is very valuable! First image below is the before and after concept. I didn’t have a neutral to work with either (at either switch) so I had to use a Shelly 1L. Spend a few minutes studying both of these - especially the first one, which as you can see when either switch is changed position the light changes to the other state than what it was before (off to on or on to off) - that i…