Laying empty conduit for house connection

Hi!

Since we currently have a trench for wastewater, we would like to lay an empty conduit for electricity and telecommunications. The electrician from the utility company said no problem, as long as we follow the rules, etc...
Well, he definitely said we should lay two DN110 Kabuflex conduits. So far so good, but I can't figure out how to connect this with the multi-utility connection (according to the drawing, we have BD14/50). From my understanding, I would need a DN110 to DN50 reducer, but there is no such thing from Kabuflex!

Does anyone have an idea?

So here are the connection fees including everything. Ideally, you save 100€ by digging your own trench. Why do you want to lay pipes at your own expense that you have no knowledge of and then be liable afterward when you have already paid for this service with the connection fee? Or is it different with you?

I wouldn't do anything at all. For me, the route for wastewater would also not be the same as that for the house connections.

Hmm, good point. So our general contractor just wanted to close the trench again, and I thought I could save myself the re-excavation. I checked again, but re-excavating would only save 213€, which is almost the cost of the DN110 pipe! However, I did think I could have saved more there!

doesn't squeeze you into the process there. Especially when it's a financial zero.

For what purpose does one lay a DN 110 empty conduit and want to reduce it to DN 50? Lay the DN 50 and connect it normally to the house connection. If the multi-utility connection is DN 50, then no DN 110 empty conduit is needed. Unless he meant lay 2 DN 110 empty conduits and you should, then you could push the DN 50 hose through the 110 one? And other trades as well. (Pull cord included) in case it gets stuck while pushing. Or am I misunderstanding something, that's my opinion.

doesn't squeeze you into the process. Especially if it's financially a wash.

Yes, you're right!

Why would you lay a DN 110 empty conduit and want to reduce it to DN 50?
Lay the DN 50 and connect it normally at the house connection.
If the multi-utility connection is DN 50, you don't need a DN 110 empty conduit either.
Unless he meant lay 2 DN 110 empty conduits and you should, could then push the DN 50 tube through the 110 one? And other trades too. (Pull string included) in case it gets stuck while pushing.

Or am I misunderstanding something, that's my opinion.

I think you can lay a line more easily if the pipe is bigger? As already mentioned, that's what the electrician told me.
For fiber optic, for example, Telekom also requires at least DN 75.

Out of curiosity, I would of course still like to know how to connect the different DN sand/waterproof pipes.
By the way, the pull string is standard in Kabuflex!