davosian

This is great stuff. Thanks for the tip!

@Jamie mccrostie Sparky - now that is a great name for an electrician I will most likely have a professional do the job since - as you have guessed correctly by my question - this is not something I really know how. That being said, I am trying to learn more about it which is why I am trying to figure out what should be done. Do you know of a good resource to learn about basics around smart home wiring? Oh, and I did find the live wire - without touching it first @FredrikKarlsson @Jamie mccrostie Thanks for your help and the lesson in kiwi-speak.

Thanks for clarifying, Peter. I just realized that indeed not all switchboxes are wired the same even though they control the same light. One of the switchboxes is combined with a wall socked which I probably could use to connect the ground wire (green-yellow) to. The third switchbox has a more complex setup with two neutral and two live wires which makes be think that this is the "main" switchbox similar to the 3-way example here: http://www.vesternet.com/resources/application-notes/apnt-92.

The guide about installing Single Switch 2 (http://manuals.fibaro.com/switch-2/) assumes that there are three cables inside the switchbox. However, my installation is missing ground ("earth") which may be because multiple switches control the same light. My apartment is rather modern since it has been constructed in 2016. Is it possible to install the single switch 2 without a ground cable? I have seen tutorials which do so with the dimmer (https://www.youtube.com/watch?v=OQ8oCvIPT4s) but I did not find any information about the switch. I was thinking of bridging N and Q1 (for the dimmer they bridge N and O), but since I did not find any information on it, I did not dare to try it. Can you give me some insight?