[Solved] Connecting 4-5kW 1-Phase Induction Hob in 10-Story Block with Single Phase Installation

Hello

I have read a lot of topics regarding induction in the apartment, some say that the induction is not in one phase, others that it is possible to connect, but each time there are different cases and I would ask for a hint from experienced people regarding my problem.

1. 10-story block
2. Wires connected to flats 4-5 years ago 4mmkw copper 3 conductors.
3. Single phase installation
4. Connection power 5.7kW
5. 25A pre-meter protection
6. The entire electrical installation in the apartment will be replaced - still 1-phase.

The question is whether, taking into account the above points, it is possible to connect an induction plate powered with 1 phase (probably a plate around 4-5kW) so that there is no need to supply a 3-phase power supply to the apartment?

I would like to add that at the moment (and probably for the next few years it will not change), the album will not be used much, I hardly use it myself, or in the future if something was to change then I would rather not worry, but I do not assume that I will suddenly be cooking big lunches on 4 burners at the same time.

After all, there are plug and play induction hobs that the manufacturer has equipped with a cord with a plug.
In addition, there is always an increase in power to 7kW.

You know, I was focused on induction, the more I started to read (e.g. on the electrode), it seemed to me more and more impossible and many people said that without the 3 phases it was only a gas stove, so I was losing hope and preferred to inquire about it a specific case, i.e. without a combination with 3 phases, it is enough to increase the connection power to 7kW and a good installation? what cable then from the switchgear to the induction would the electrician lay? 3x4mmkw?

(thank you for the answer kkas12)

In my humble opinion, nothing will happen if you add a few zlotys and pull a few cables, e.g. 5x 2.5mm2 and 5x4mm2, and in the fuse box you leave a few empty places for additional security.

The issue of finances is secondary, so I will definitely consider adding a 5x cable as you suggest, I do not know about installations, so I preferred to ask, so far it does not promise to connect 3 phases and I just wanted to know if there is a possibility to connect this board on 1 phase, but I also did not think to add a cable with one robot, as if something changed in the future. (thanks for showing interest)

Elektromaciek wrote:

what cable then from the switchgear to the induction would the electrician lay? 3x4mmkw?

If you have a separate circuit, nothing needs to be added.
If, however, you will arrange a new one, follow what your colleague wrote above and arrange at least 5x2.5mm2. It may be useful in the future.
However, in this case it may be necessary to replace the fuse board due to insufficient space for the new fuse.
And attention, if the board will be connected with a socket and a plug, it requires a residual current device.
If it is permanently connected, the RCD is not required.

I think I already know everything, thanks a lot for the answers, I just think about the last post and I will be clear.

All wires in the whole apartment will be new + new fuse board in the apartment from which the wires will go, I planned to permanently connect the induction to a surface-mounted "box" (such a hermetic square).

Assuming that at the moment we stay with the 1st phase and we only increase the connection power to 7kW, the 5x2.5 cable is enough instead of 3x4 (this is what I assumed now for a 1-phase power supply for electricians to pull from the board) because I understand that at 5x2.5 - 2 the phase wires are not connected (in reserve), and we connect only 1phase + N + PE? in this case, 2.5 will not be too weak?

Buddy, the socket and plug load are 16A.
For a cross section of 2.5mm2, this value is not a threat.

But the condition is to buy a board with a plug, i.e. dedicated to single-phase power supply.

Gentlemen. The power supply cable for the apartment can withstand a maximum of 27A, the 5 kW cooker itself will generate 21A on one phase (with all fields turned on), and what about the dishwasher, washing machine and other equipment? 5x4mm2 is the minimum for the apartment connection.

You should buy a CD with a limited maximum power consumption.
Or the declared 3.5 kW.

Priority relays.

Relays don't do the trick.

But they'll drop the load. Wogole is a dream come true with such low power to pack into induction. And how do you know that it will be possible to buy additional power block. The 3.5 kw album is a failure. I always do 5x4 induction, and I don't play carvings.

And are you using a CD?
I have installed the boards in blocks and with a 3.5kW limitation there is no problem in use.

I am aware that the optimal solution would be a 3-phase power supply, but at the moment and in the next 3-5 years it will not be possible, I would like to give up gas and therefore this induction, I know that it will not work with full power, but also until it will be possible to connect 2 more phases, then on this plate will be placed: a pot to boil potatoes, cook rice, "vegetables with chicken from the pan", scrambled eggs ... ).

(PS: when I watch something, I watch the conversation all the time)

I have a phone number for the lady who uses the disc in this way?

Zbigniew 400, I agree with you. In general, I very rarely do anything in blocks. I personally do not have induction. But I have derived a 5x4 induction from a 5x10 power supply and bought 22kW. I don't think he should be saving on cables. If I had "W", I would put priorities.

Priority doesn't do the trick, just power limitation.

I would like to add that there is no question of saving, as I mentioned, finances are a secondary issue, the installation in the block was replaced about 4-5 years ago, unfortunately they did not think that someone might want to have 3 phases in the apartment and they let 3-wire cables on 10 floors, on at this moment, the apartment is "bare" and the entire installation, including the security board, will be replaced for the entire apartment.

There will be no miracles on a four-wire power supply.

Added after 7 [minutes]:

I will ask professionals what methods you have zero for induction in a can. I twist soldering for fear of losing zero.

Elektromaciek. If many tenants wanted 3 phases, will the power supply of the building last?

Perhaps this is the reason why these 3 phases do not exist? I have no idea, I thought that the electricity supplier / electricity supplier could provide "electricity" for a given demand, for 10 floors, probably 10-15 apartments would be under 3-phase, maybe it is too many users, unfortunately, that's why I wrote a question with a request for advice from smarter people, because I don't know myself.

Edit: Because as I mentioned, the installation was replaced not so long ago (meters, wires ...) in the entire building, so if it was physically possible to bring the right "amount" of electricity to the building and its security, they could replace the installation so that these 3 phases could be installed in the future.

Elektromaciek wrote:

on 10 floors, they let out 3-core wires, at the moment the apartment is "bare" and the entire installation, including the security board, will be replaced for the entire apartment.

Because it's cheaper, they did as it was before the replacement of the WLZ.
I know such blocks where there is one phase per 10 floors.

Communities and Cooperatives combine so that if you want 3 phases, you have to run WLZ through X floors to RG.
It was like that with my daughter - she lives on the ground floor. WLZ-th 3f replaced.
And so, against ZE, they ordered to pull the cable to RG.
In RG they gave this place dedicated fuses.
Of course, there is also a conversion factor on the first floor.

And where are the WLZ conducted? Isn't that the kind of board where you have shafts with a meter and a switchboard between the toilet and the bathroom? It would be worth considering in such a way that the possible replacement of the WLZ would not require breaking the whole flat anew.

The connection to the apartment runs through the corridor about 7-8 meters and is led above the entrance door, there is also a switchgear with security, also if they let 3 phases, only a photo of the switchboard will be needed and the wire will be pulled, but I doubt that this will change quickly because the corridors are renovated , coats, lining of entrance doors to apartments, lights on the motion sensor, also rather under 3 phases, they will not scratch the walls quickly.

So ok, anyway, it is enough to drill through the wall if what. I would just buy a larger switchboard for the future and make more circuits

Elektromaciek wrote:

The connection to the apartment runs through the corridor about 7-8 meters and is led above the entrance door, there is also a switchgear with security, also if they let 3 phases, only a photo of the switchboard will be needed and the wire will be pulled, but I doubt that this will change quickly because the corridors are renovated , coats, lining of entrance doors to apartments, lights on the motion sensor, also rather under 3 phases, they will not scratch the walls quickly.

And you can't lead the power line in the surface-mounted trough?

I will ask, but I did some research and a difficult topic, in the block there is a generation change slowly, but still most of them are older people and, unfortunately, the manager is focused on them, they all have junkers + gas stove and when I asked about the possibility of supplying the apartment with 3 phases, it was not literally but I got the answer that it is a pity for one apartment, I do not know if they do not tell everyone, because for sure some younger tenants would be willing, but so far the managers, due to the age of tenants, are more interested in putting a bench under the block and planting 3 Christmas trees than parking for residents or 3 phases in apartments.

I can not find if you wrote where the counter is located?
And somehow I don't feel like believing that all the premises are powered by the same phase.