I bought a Shelly1 and I'm struggling to install it in a two way switching system.
Most of the diagrams I found show the installation in the ceiling rose, however I'd like to know if it would be possible to install it behind one of the 2 wall switches.
My system looks identical to the diagram below (original link)
- switch1 (the bottom one on the diagram) has more space as it has fewer wires. It only has a "three core and earth" cable. If possible my preference would be to install the Shelly behind this switch.
- switch2 (the top one on the diagram above) has the "three core and earth" cable connecting to switch1, plus a twin and earth cable (with permanent live and a switched live) going to the ceiling rose.
None of the switches has a Neutral cable and that's the main reason I'm wondering if installing the Shelly behind the wall switches in this setup is even possible.
I would like both switches to continue working as they currently do and having the Shelly as a third way of controlling the lights.