Split the underground cable into 2 circuits

And since you have particularly little knowledge, really let the specialist do it. There are cable lengths, etc. to consider. Otherwise, it can really be deadly.

Please remember... The current that flows into a wire also flows back through the neutral conductor. If you now make 3 circuits of 16A each, a maximum of 48A would flow through the neutral conductor. That doesn't go well. If we disregard the thermal load for a moment, I would either make 2 circuits of 16A (1st circuit Brown+Blue, 2nd circuit Black+Gray) or 3 circuits of 6A (1st circuit Brown+Blue, 2nd circuit Black+Blue, 3rd circuit Gray+Blue).

Yes, junction sleeve for the earth. If you want to split it, you'll just need more cables. Preferably also the black earth cables.

And since you have particularly little knowledge, really let a professional do it. There are cable lengths, etc. to consider. Otherwise, it can really end fatally.

Well, if he doesn’t have a good contact to an electrician, the tinkering can easily cost 150+. It wouldn’t be worth it to me, but everyone has to decide for themselves. Besides, no one cares about cable lengths unless he has a 2000 sqm property and doesn’t want to lay the cable all the way to the last end.
What is supposed to be connected? Just a few lamps?

My God, you write faster than I can quote

Do you want tips now or not?

Not on how to connect the cable, no. Just whether I can split it up in the garden.

Yes, you can. You have to measure what each conductor is.
Classically brown, black, gray are phases 1-3, blue is the neutral conductor and yellow/green the protective conductor. So for each circuit one phase, the protective conductor as well as the protective conductor use.

Protective conductor and protective conductor?
As I wrote, the switch for this underground cable is not yet connected in the electrical distribution. I can’t measure anything there.

Before you split it further, you can just put a distributor and then continue with 3-core underground cables each.

Good idea, right.
Then I can just lay out the 3-core cables on the left and right already, and later the electrician can connect at the distribution box.

And since you have particularly little knowledge, really let a professional do it. There are cable lengths, etc. to consider. Otherwise it can really be deadly.

Definitely. I’m saying, I just want to lay the cables in the garden to appropriate spots because the topsoil will be delivered this week.

Please remember... The current flowing into a conductor also flows back through the neutral conductor. If you make 3 circuits of 16A each, a maximum of 48A would flow over the neutral conductor. That doesn’t work well. Leaving aside thermal load, I would either make 2 circuits of 16A (1st circuit brown+blue 2nd circuit black+gray) or 3 circuits of 6A (1st circuit brown+blue, 2nd circuit black+blue 3rd circuit gray+blue).

Great, thanks for the tips.
I don’t yet know if I will make 3 circuits.

Well, if he doesn’t have good contact with the electrician, the fiddling around costs 150+ easily. Not worth it to me, but everyone has to decide for themselves. By the way, no one looks at cable lengths unless he has a 2000sqm property and doesn’t want to lay the cable to the very end.
What is supposed to be connected? Just a few lamps?

Cable length for me is then max 100m per circuit.
Actually, only lamps or maybe a decorative fountain pump are supposed to be connected.

I also have a question about that...

We have also laid a 5-core cable outside to the garden...

Would it now be possible to connect 1x constant power (sockets and lighting in the garden house) and 2x separately switchable (1x lighting in the garden, 1x fountain in the garden)?

Of course, I would have the whole thing wired by an electrician. It is just a question in advance...

The cable length is then a maximum of 100m per circuit for me.
Actually, only lamps or maybe a decorative fountain pump are to be connected.

Oh dear. I hereby revise my statement. 100m is really quite a lot. I’m not a standards expert, but this exceeds the limit by far over 100%.

I also have a question about that...

We also laid a 5-core cable outside into the garden...

Would it now be possible to connect 1x permanent power (sockets and lighting in the garden house) and 2x separately switchable (1x lighting in the garden, 1x fountain in the garden)?

Of course, I would have the whole thing wired by an electrician. It is just a question beforehand...

Yes