Intertechno/wall switch experience with energy saving lamps/LEDs?

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Yeah, I would have bought the ITL-230 if it supported energy saving lamps or LEDs because I don’t have any classical (older and more power consuming) lightbulb installed.

The problem is, that the ITL-1000 has to have power all the time. To me that is reasonable, because otherwise it couldn’t receive any signals.
To use both switches (radio and mechanical) they either need to be installed parallel or the mechanical switch has to indicate the ITL, that its switch state has changed. The last solution is really pretty realized when you install the ITL-230.

Using the potential free switching is a nice idea, but I would have to supply power the lamp somehow, right?

Having digged a little deeper, I don’t think the potential free switching will work in this context. I think @V1per 's suggestion (the drawing in post 11) should do the trick and logically it is parallel switch. You must be careful with the cabling, however.

Here is another drawing. The red line ist the cabling for the mechanical switch. The wire bridge X is kept in as is.

Besides this ITLM-1000 appears to be the better choice for your setting and on/off siwtch but it lacks the other features like the timer and the potential free switching option.

In the wall closet you should have two blue wires and one black wire, but quiet often it is somewhat different and you’ll need to check which has phase anyway. On one cable (blue) you should have the phase. This needs to be mounted to L of the terminal. The other blue cable (no phase) is mounted to “switch out” (the third pin from the left) of the terminal. The black cable N (no phase) is mounted to N. Now you need two cables to mount you mechanical switch. If possible mount them to L and “switch out” of the terminal.

“Final update”: Now I had the time to do the wiring, it worked as intended, but both (the ITL-1000 and the mechanical switch) won’t fit into the socket together by 1-2mm. I’m not sure whether I should be crying or laughing

@mwittig: Thanks for the detailed instructions In my case the live (L) wire was the black one and the neutral (N) one was blue. It’s always good to expect the unexpected

I hope the Intertechno sender (wall mounted and motion detector) will arrive next week for further improvement ^^

@Marie Thanks for the update. Too bad, the ITL-1000 and the mechanical switch don’t fit in the socket housing. It may be possible to tweak the socket housing by cutting off the body, but I don’t recommend to do this in a rented flat. Regarding the wiring did you manage to get a full change-over between the two switches, i.e. are you able to switch via remote when the mechanical switch has been switch “on” before? I have just noticed that the suggested wiring does not allow for this, afaics.

@mwittig What do you mean by “full change-over”? Switching on via mechanical switch and switching off via radio or vice versa? That didn’t work.
The light was on when one or two of the switches were on and it was only dark when both were switched off. This is not what I originally looked for in the first post, but it is the behaviour, I expected after this discussion.

So, lessons learned. Next room will be the ITL-230 and LED-Freund (?) after I measured the socket housing very, very carefully. Unfortunately its a rented flat, so I can’t make it fit