Future-proof electrical planning in new construction

The procedure. With conventional wiring, you have a separated phase without a neutral conductor, which limits yourself.

Preferably feed everything in a star configuration. If that’s not possible (e.g., it becomes too expensive), then at least wire all lights and blinds individually and sockets per room in a ring with 5x1.5. This way, you can still decide much later how each socket and light is finally controlled. With continuous power or separately and/or switchable together in groups, each and always changeable without mess and major effort.

OK I will suggest it to the electrician.

What advantages does everything in the star have?

If we do it this way, then we can definitely retrofit Matter Opus or other retrofit solutions.

With conventional, retrofitting is not that easy.

Did I understand that correctly?

I described that. With a star aka structured cabling, almost all paths are open to you even after years. Because you can connect everything exactly how you need it, and phase, neutral, and green-yellow are practically present everywhere (wherever you decide to place it). Taken to the extreme, this even partly covers KNX, Free@home, and other wired systems.

With conventional cabling, you inevitably end up with wall sockets (which then have their own limitations) and also reach limits regarding cross-sections etc., and so on. Then neutral is missing here and there, and to realize a simple central switch, you put in much more effort than necessary.

Calculations from the early 2000s showed that, for example, KNX pays off from 13 roller shutters as it becomes overall cheaper compared to conventional cabling with the same range of functions. Nowadays, prices have of course fallen somewhat, and we are probably at 9-10 devices now.

But yes, conventional is still being built enthusiastically, because it is cheap due to the fact that you basically install nothing except light on/off, roller shutter up/down, and you can already do that in the first year of apprenticeship. Because there isn’t much to think about... and of course: "we have always done it this way"(c)

OK thanks I will discuss this with the electrician.

Can you possibly estimate what the surcharge for star wiring compared to conventional wiring would be so that we can recognize if the electrician is overcharging?

Can you also possibly estimate what a Busch free@home and KNX solution would cost if you consider the conventional wiring (which would then be omitted)?

I know that you can only estimate the surcharge costs.
I would still appreciate a price estimate.

Could you possibly estimate what the surcharge for star wiring compared to conventional wiring would be, so that we can tell if the electrician is overcharging?

About 1/3 more. Although more material is needed, the terminal points and additional box drillings are eliminated. In other words, more cables but less labor time.

Could you also possibly estimate what a Busch free@home and KNX solution would cost if the conventional wiring (which is then no longer needed) is taken into account?

It very much depends on what is installed. Even just the choice of different switches can blow any budget.

Thank you. We will see what price he quotes us for Free@Home. The developer said that the electrician offers that (he didn’t know about KNX).

Which areas should we include in Free@Home?

Roller shutters
Lights
Video doorbell
Heating

What else makes sense?

Sockets? I don’t think I need to be able to switch those; it would probably only make sense in very few cases.
And then we can’t make 2 or 3 out of 1 socket ourselves, for example.

What else should we include?

The window contacts are installed afterwards wirelessly under the handle.