Time has passed and the framing of the house has been built. I would like to thank you again for your support. That helped a lot.
Because it might be interresting to other newbies having the same question, here is what we did/will do:
- the lights in the groundfloor and some lights in the upper floor are connected in a "conventional manner" to the central wiring cabinet in the room marked "HWR". These lights are switched on an off by using pushbuttons (hope that's the right word), not switches. My electrician used the green EIB/KNX wire for the buttons so that we can use these cables for KNX later on.
- We will put a EIB wire in almost every wall, just a few centimeters below the ceiling with junction-boxes at strategic points
- we have used a separate wire with 5 cores instead of three to connect the power sockets in the living room. That gives us the option to decide later which power sockets should be switchable. The sockets in the kittchen are wired in the same manner with another cable, both cables ending in the HWR.
- we will put additional EIB wires to those switches that are conventional switches in the upper floor. That gives us the option to easily replace them by knx sensors if we want to.
- Most lights in the upper floor can be equipped with KNX actors easily because we have an inserted ceiling and the actors can placed in the attic.
- CAT7 cabling in almost every room
The changes mentioned above cost about 200,-€ extra (not including the CAT7 wiring) and give us full flexibility to switch to home automation later on. We are very happy with that solution because we can extend it step by step as we develop new ideas.
Please excuse my terrible english. I had to look up almost every second word and I'm pretty unsure about the technical terms.
If you are interrested (and maybe are able to read some german) - we are blogging the complete building process and I will describe our wiring strategy in german:
And please do not hesitate to click on the interresting google ads there... That helps me to buy the nessessary KNX equipment even earlyer...
Greetings from Berlin