[Solved] Circuit Separation: Induction Hob & Oven on 3F (5x4mm²), RCD & 16A Breakers, Dishwasher & Fridge

Tomotron wrote:

New electrical installation, an electrician came up with the idea that there would be a dishwasher, refrigerator, oven and hood on one circuit.

Change the electrician. I wonder if you can make him fix what he messed up so that he would pay for the damaged material with which the kitchen was finished.
The oven MUST be on a separate circuit. To be more precise, the standard states that stationary devices with a power of 2.kW or more must be powered from separate circuits.

Tomotron wrote:

Will it be a good idea to separate the 3F circuit (5x4mm2) which is intended for connecting the induction hob (connected to 2F) Use the free phase to connect the oven.

You can not. The hob uses 2 phases plus N. The oven would use the third phase and N. So N would be common, which is unacceptable. As I wrote earlier: "stationary devices with a power of 2.kW or more must be powered from separate circuits." Also for both of these devices N must also be separate.

Tomotron wrote:

I plan to leave the RCD due to the oven and power the board through a 16A double pole circuit breaker and the oven single pole 16A

Leave planning to an electrician who knows what he is doing (certainly not present). Distribution of overcurrent circuit breakers is theoretically appropriate, but the wires to the devices must be properly laid out.

Zbigniew 400 wrote:

Very often I meet in new blocks with energy supply to the hob and oven sets 1 with a 5 X4 cable.

I also meet, not only with such exceptions. Then it means a meeting with an "electrician" who calls himself that because he connects the wires. And there are no qualifications or education in this direction, probably the same as the author's electrician.

Of course, such a connection will work. However, if you make any changes to the installation, or in general during its use, you must be able to turn off the circuit, not just half because someone saved a few zlotys on the wire.

Zbigniew 400 wrote:

And who receives the installations in blocks and checks the correctness of the execution and design?

I guess that was the question directed at me.
Usually, no one answers, and there is no project, except verbal agreement with the client where he wants the socket.

Zbigniew 400 wrote:

And the peak of intelligence is 1 common differential for the whole apartment.

Why the top? It is sufficient, although inconvenient, and can be problematic when using multiple switched-mode power supplies.

When performing installations in buildings - I haven't done it for some time, I was in favor of the maximum number of circuits - it is logical, 5 * 12 switchgear for a 120-140 m house
When I bought my apartment in a block of flats (relatively new, because it's 10 years old), not having time to deal with the renovation, I took the installation for granted as ok, only for cosmetics.
This is how most investors woke up, everything in copper, only that in 3*1.5, I led new power supplies to the kitchen and bathroom with a throw on the tape. There are 14 circuits on 84 m2, but I didn't do everything according to my art because I felt sorry for the already plastered walls. Let's not go to extremes, we don't use these installations industrially, sometimes we have to refer to the existing state and in my opinion making connections is more important in this particular case than 4-5 circuits for the kitchen.