Modernization of single-phase to three-phase installation in the block

Hello, I wanted to modernize the installation from one-phase to three-phase ..., I applied for an increase in power and a change to three-phase current. the electrician adjusted the installation in the premises and instructed me that in the vertical, on the cage where the meter is, the station or the administration takes care of it. This is where the stairs begin. The request was processed Stoen agreed to increase the power and change the installation. But .. it turned out that I had to pull the cord vertically. I went one more time to the energy department which deals with the area in order to obtain any information (unfortunately I did not find out anything) (So how is it whether the customer bears the costs of changing the premises or also for? If the customer actually bears .. then what will the approximate cost of it be .. the premises is located on the 2nd floor .... The electricians I have dealt with do not they wanted to play outside the premises If someone has struggled with a similar problem, I am waiting for some tips ...

2) Is it possible to connect an induction hob on a single-phase installation, I will add that as of today, all cables are replaced with a cross-section of 2.5 to the kitchen, the cable is probably 5x3.5, the connection power in the premises is 5kw

Regards and waiting for tips
djfly

5 kW allocation is not enough for an induction hob, as they are usually 8-12 kW.
It would be possible for one phase, but the cable for such a record would have to be 3x6, although I'm not sure if it is not 3x10 ... And that's an abstraction. Also three phases necessary.

On this power allocation it would be OK, but on the condition that at most one or two fields would be turned on at the same time, and of course only the board, because nothing else at home could be used simultaneously
I think you should try to get, I don't know ... Circle 15 kW, +/- 2kW. Of course, it will not hurt more, but it will be an unnecessary expense for a block, and the costs ... For 1 kW, they probably want something around PLN 120.

For electric cookers of all kinds, it usually extends 5x4. They usually use two phases, so the third is usually spent on the oven.

WELCOME, I am not surprised that some electricians do not want to take up the topic. If, as you write, the apartment is located on the 2nd floor, and the building design does not provide for cable channels, this is a slight problem, but more on that later. It is so in Poland that I will only install a meter
and for the rest you have to worry about yourself, you still need to get the approval of the building manager, even though you are the owner of the apartment, as I guess, apart from the costs that your colleague wrote about earlier, I think you will incur the costs of the project (but I'm not sure about the project) and you are still waiting for Finally, taking measurements for the 230V installation, in this case I DO NOT RECOMMEND. Regards MIREK

Hmm, in addition, the electrician pulled the wrong wire because I think I have 5x2.5 or 5x3.5 ((and as for the costs, I'm exactly interested in ... how many zlotys, when it comes to risers, there are counters and boxes, so some openings between the floors are definitely ...

But they don't have to be, the cables might as well have been embedded in the plaster. It was also done in the past.

PS: There are no 3.5 cables They are 0.5; 0.7; 1.5; 2.5; 4; 6; 10; 16; 25 etc ...

Hmm, I have a 5x2.5 (Is that not enough for an induction cooker ?? it is a separate cable directly connected to the switchboard ...

Let's assume a plate power of 10 kW.
It is about 43A, so ideally it is equal to the phase, i.e. ~ 21A. But you have to assume that the power is not so evenly divided due to the different strength of the fields, so there may be a little more here and less here.

Let's say the 24A is a lot for 2.5 mm2, because such a cable should secure a maximum of 16A.
The long-term load capacity of such a section is 19.5 A ...

I do not know, they put one, but cheaper, it certainly explains a lot ...

I would definitely put 5x4 at home.

On the other hand, the old standards said that the load capacity was 27A! A bit of a discrepancy, isn't it?

Hmm, yes 19.5 a 27 And this is the difference ... but I do not understand why there are 5 wires in this kitchen, I'm not an electrician, so maybe someone will explain to me? Because if ... this cable may be insufficient with full wykozystaniu the plate, that is, from 4 burners to the maximum .. but I wonder how it would relate, for example, to wykozystaniu max 2 ...

5 wires, i.e. 3 phases:
L1
L2
L3
Neutral conductor (0)
and protective conductor (PE)

OK, what power can pass through one 2.5 2kw will do the trick?

Theoretically, for 1mm ^ 2 you can give max 10A, so a 2.5mm cable will "lift" 25A.
However, as can be seen from michcio's posts, there are discrepancies.
But even if you accept the worst case, i.e. 19.5A, you have almost 4.5kW on this cable. Perhaps the electrician gave 1 wire for 1 plate, 2 for the other 3 for the oven etc. Then, assuming that you do not use all of them at the same time, it will be ok, if not, you will "cook" the neutral wire.

I can't cook a neutral one. The sum of the currents will not flow through it, at best it will not even flow through it at all (with the same phase load). This is alternating current, not direct.

At most, you can assume that the board has 8 kW, it will be 17-18 A, so it will be OK.
But I don't know about the comfort of cooking in such a kitchen, maybe it's OK too.

Quote:

The sum of the currents will not flow through it, at best it will not even flow through it at all (with the same phase load)

And the "heaters" in the stove are 230V or 400V?

Only if the power supply is 230V. then you can "boil" the cord.

yes, I mean 230v with a cross section of 5x2.5. The cable is already covered with plasters, so I do not want to clap it twice, maybe there is some way to use it, however?

Arturo2005 wrote:

Quote:

The sum of the currents will not flow through it, at best it will not even flow through it at all (with the same phase load)

And the "heaters" in the stove are 230V or 400V?

There are two groups of heaters, 230V of course. If there is "force", these groups are connected to two phases, if not, it bridges to one phase.
So they are not interfacial.

And the sum of the currents will not flow through the neutral?

Will flow. GEOMETRIC sum, which means that the current in the neutral conductor never exceeds that in the phase conductor.
In this case, if there is a 5x wire and we want to connect to one phase, it would be best to use two wires as phase, two as zero and one as PE. Of course, mark the ends appropriately.

WELCOME. Colleagues, I can see that the issue of the board itself is being decided, and as for the rest of the house, there are, as I guess, other electrical appliances in the apartment, so maybe a friend would give the distance from the meter to his apartment and, if possible, he wrote all the power (all devices in apartment) needed for proper operation and then we will start with that because now I really can't see any other than this album. Regards MIREK

stomat wrote:

Will flow.

And Michcio says the opposite

Quote:

The sum of the currents will not flow through it, at best it will not even flow through it at all (with the same phase load). This is alternating current, not direct