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The electrician presented the star wiring as a very big effort for which he needs much more time.

That is definitely an additional effort. However, he would have the same with Fee@Home. The wiring is the same there, if I’m not completely mistaken.

I read from your messages that switchable sockets are actually nonsense, or did I misunderstand that?

Well, I also don’t think much of making all sockets switchable from the start. But there are certainly use cases, for example at our place switchable: - Living room, to be able to switch the lighting in the cabinet with scenes (crawling behind the cabinet to press the button would also work, but that’s not smart ;-) ) - In the bathroom, one socket each switchable for an electric bathroom heater (which we will probably never need). - In the bathroom one socket each, so the toothbrush only charges during the day ;-) Admittedly, purely switched ones are more like toys. Switching and measuring is what’s really good (and as far as I know Busch-Jaeger actuators, for example, CANNOT do that): - TV and AV receiver are switchable and switch off after a certain time in standby. - Microwave socket is switched on when the door is opened with a reed contact and turns off again after use. - Washing machine and dryer sockets are switchable and then notify when the device is finished (I still want to do that) or switch off the power. - Refrigerator can be measured and alert whether it is on (or off for too long). Otherwise, here and also in the KNX user forum there are many threads with ideas, gadgets etc. for the sockets. Consider in advance which sockets you want to be switchable and why, and let the other rooms be wired as described above with a 5-core or 7-core cable. But I have to admit, we did not do that consistently on the upper floor and so far nothing is missing, but we also do not have the certainty that everything is possible.

Modern TVs should not be unplugged. Processes that require power run in standby mode, such as the regeneration cycle of OLEDs. This is also stated in the manual. The status of the TV for further automations can often be obtained in other ways.

As for the microwave, I would like to see the calculation of how many years it can comfortably remain in standby mode until the switchable socket with wiring has paid for itself.

I still haven't found a meaningful use for the sockets

The socket for the towel radiator could be interesting but do you even need to turn on the towel radiator in a KFW55 house with underfloor heating? It should already be warm enough in the bathroom, right?

The sockets for the washing machine and dryer are interesting but we wanted to get a washing machine and dryer (from Bosch or Siemens) that can be operated via app, which also shows the remaining time; our kitchen appliances are also from Bosch and thus compatible in one app

I am thinking whether we should just make the sockets completely conventional (to save costs) or go with the option with the 5x1.5mm cable to later be able to switch 2 sockets/groups?

I’m not saying you have to do it, it was just the question of what you CAN do. There was still one channel left and until I have another use for it, I’m turning off the MW ;-)

With the TV, I have a delay of 15 minutes after reaching standby. But yes, I will check that again.

Feel free! As I said, no one has to switch any sockets because of me! But it's good that you think about it beforehand - read and look for examples. And ideally, have the rooms wired with 5-core cables, then you are relatively flexible.

I will consider that and ask the electrician for the price difference.

I have attached our floor plan and marked a bit.

Red = lamps
Green = switches with bus cable

I hope you can give me more useful tips that I can take into account for the KNX installation.

Do we even need so many switches?
Do we need presence detectors?
Do presence detectors even make sense if you have a large dog? (Bernese Mountain Dog 50 KG) The dog is allowed everywhere with us and would probably always trigger the presence detectors.

What are we still missing or what can be improved?