Electrical planning - How many sockets are enough?

So, now here comes a really stupid question, please forgive me.

Is it common for the cables / empty conduits to be laid on the raw floor?

I'm currently bothering my architects a bit to finish the electrician's scope of work, because I always assumed due to KNX that all the cables go into the filigree concrete ceiling together with the controlled residential ventilation and then get concreted in with cast-in-place concrete?!

I'm bothering them about this because I assumed that the electrician and the raw builder have to work simultaneously...

Is it common for the cables / empty conduits to be laid on the raw floor?

I believe this is common, but not necessarily required.

Theoretically, one could lay all supply cables in the ceilings and then let them rise appropriately at the respective locations (TV, desk, etc.) in the concrete (e.g. socket supply line per room, satellite or network).
Then you can chase the rest of the cables into the walls and save yourself from laying them on the concrete ceilings.

However, we decided to lay them on the floor because on one hand you have to chase less and thus have fewer cables in the walls. And on the other hand, you are more flexible if you want to make changes afterward.
For us, only the supply lines for the lighting and the motors of the roller shutters / blinds are in the concrete ceilings, because we also have ventilation installed there and it already got very tight with empty conduits.

The structural engineer certainly threw up his hands in despair.

Unfortunately, I can't find anywhere that it must be an empty conduit and not just a protective pipe, and that it must be replaceable.

I never managed that either ...

I had an independent expert yesterday [...]

Did this expert also explicitly say anything about the question of empty conduit/replaceability/protective pipe?

Hello truce,
thank you very much for your quick reply.

The structural engineer certainly threw up his hands

Yep, our structural engineer also always has beads of sweat on his forehead whenever there is news from us

If you place the electrical installation on the RFB, how high would your floor construction then be?

Which layer would then level out the cables with the following construction (160mm) (i.e. have less material over the conduits)? Or does the entire construction grow by the diameter of the conduits?

15mm top layer (industrial parquet)
65mm cement screed
20mm impact sound insulation
50mm floor insulation board
10mm vapor barrier

Somehow I find your variant more charming...

If you place the electrical installation on the RFB, how high is your floor construction then?

Which layer would then compensate for the pipes in the following construction (160mm) (i.e. have less material above the empty conduits)? Or does the entire construction grow by the diameter of the empty conduits?

In our case, there is 2x40mm insulation on the ground floor and 1x50mm insulation on the upper floor.

The empty conduits, as well as the sanitary pipes, should all “disappear” within it.

The screed layer installer, or whoever lays the insulation, can look forward to this.
Because they have to cut out all the pipes and then fill with insulating granulate.

So, in every variant, there is someone who is not quite happy.

We also routed the cables well above the beams due to the increased number of cables for KNX in our electrical system. The conduits disappear in the insulation. An electrician later said that conduits wouldn’t be necessary with NYM cables. But I preferred it that way anyway. We wouldn’t have had proper space in the ceiling at all.

Regards