Which power cable / earth cable for 80 meters development

Ok. If the meter is located in the handover cabinet, the matter looks a bit different. Then a maximum voltage drop of 3% applies up to the last luminaire and 5% up to the socket. Then the 70mm² is definitely oversized. I can recalculate that again tomorrow.

Up to the box, the utility company lays its cable, over which you have no influence (neither on the cable type nor on the cross-section). Usually, they lay NAYY (correct, that is aluminum) because it is cheaper. From the box onward, copper is usually used (NYY).

The difference between the two cable types is as follows:
4x35/16 means 4 cores of 35 mm² each + an outer braid with a cross-section of 16 mm².
4x70/35 means 4 cores of 70 mm² each + an outer braid with a cross-section of 35 mm².
The outer braid is like a kind of 5th core, which is braided around the other 4 and is reduced in cross-section. This can be used because in 5-core applications the protective conductor (PE) can possibly be reduced in cross-section.

As said, in my opinion, this is not necessary, because the 5th core can be completely omitted up to the house distribution. Inside the house, as mentioned, 5-core wiring must be used. This is necessary so that protective devices such as the residual current device (RCD) function properly.

I am not an electrician.

In general, I would advise you to lay a 5 x 10mm² copper cable into the house from the transfer point. Regardless of all tables.

And right next to it, two empty conduits. Times change. I have also installed 5 x 10mm² everywhere in my place, as well as in the other buildings. Especially with regard to photovoltaics, electric cars, heat pumps, etc. I think with such a cross-section you are on the absolutely safe side.

That is of course oversized but allows for greater loads in the future. So you don’t have to lay thicker cable again in 20 years.
I would lay a thick KG pipe from the house to the transfer box. Then there is enough space for later cables, wallbox etc.
You just can’t know today what kind of toys we will have in 10 or 20 years.

I have also installed 5 x 10 m² everywhere in my place as well as in the other buildings.

5x 10 m² = 50 m² cross-section?! :rolleyes: That is an 8 m diameter – sounds a lot like a tunnel boring machine you had brought in. You're right, you could possibly operate not just an electric car but an entire double-track subway line ;) *duckandrun*

Hmm, the cable wasn't that thick after all.

Yes, the "m" obviously doesn't belong there. Well spotted! You'll get an extra point right away!