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Verifying Electrical Strength in Newly Renovated Apartment: Practical Guide

Dyta 64263 41
Best answers

How can I verify whether my renovated apartment has enough electrical supply for an induction hob, and is the cable near the oven enough to prove it?

No—the cable near the oven is not enough to prove that you have the right supply; you need to check the switchboard, the pre-meter protection, and the power allocation/contracted power [#16874082][#16874430][#16874954] From the photos and comments, the apartment appears to have a single-phase supply, not “force”/three-phase [#16874057][#16874062] The reported pre-meter protection was 25A, which gives about 4.5–5.75 kW depending on the limit, so a 7.6 kW induction hob is too much without increasing the power and rebuilding the installation [#16874430][#16874663][#16875210] If you do not want to modernize the installation now, choose a hob with power regulation and make sure its maximum draw fits the available supply [#16874663][#16874979] To decide properly, you still need an electrician or a现场 check, because forum advice can only go so far without seeing the installation in person [#16874430]
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  • #1 16873545
    Dyta
    Level 7  
    Good day. I know that there has already been a similar topic, but it is closed. We bought an apartment after renovation and we have no idea if there is strength in the apartment. Cables come out by the oven that supposedly indicate it is there. Is it enough or should we check it somewhere else? I will be very grateful for your help!
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  • #2 16873550
    krzysiozak
    Level 40  
    Show the photo, from the board, with security, powering the apartment.
  • #3 16873701
    mawerix123
    Level 39  
    What is this strength supposed to be for? :?:
    What is the electricity meter :?:
  • #4 16873707
    Dyta
    Level 7  
    I can't take a picture right now, I'll post it in a few hours. :)

    We want to connect an induction hob. Is this force even necessary? Sorry for the maybe stupid and basic questions, but we are laymen.
  • #5 16873734
    Dyta
    Level 7  
    We do not have this board yet, so we prefer to find out if we have any power connected at all to choose the equipment.
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  • #6 16873982
    elpapiotr
    Electrician specialist  
    Hello.
    The photo below with a 4-pole RCD indicates that there may be a so-called "strength"
    Nothing could be more wrong :D

    Verifying Electrical Strength in Newly Renovated Apartment: Practical Guide
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  • Helpful post
    #7 16874029
    jurex2
    Level 17  
    Most electric stoves work in 2 phases, when using 2 "burners" one phase is used after switching on the other 2 phases - check very simply - how many wires protrude from the wall near the stove, if more than 3 is the so-called "force", and you have to be careful with connecting so that by accident all 3 phases do not go to the power supply - I was repairing such an indesit cooker - high power transistors from the welding machine could be selected
  • #8 16874054
    Dyta
    Level 7  
    Verifying Electrical Strength in Newly Renovated Apartment: Practical Guide Verifying Electrical Strength in Newly Renovated Apartment: Practical Guide Verifying Electrical Strength in Newly Renovated Apartment: Practical Guide Verifying Electrical Strength in Newly Renovated Apartment: Practical Guide

    I don't know if that's it - I'm just pasting some photos
  • Helpful post
    #9 16874057
    Peter134
    Level 18  
    1-phase power supply.
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  • Helpful post
    #10 16874062
    viertnik
    Level 17  
    Sorry, but there is no "strength". As I am writing, my colleague Peter134 is a 1-phase power supply.
  • #11 16874069
    Dyta
    Level 7  
    Thank you very much for your help :)
    Does connecting "force" involve forging in the wall?
    And without these changes, would you recommend buying an induction or rather an ordinary electric cooker?
    I will be grateful for every comment
  • Helpful post
    #12 16874082
    Peter134
    Level 18  
    Yes. Replacement of WLZ, meters, protections, modernization of the switchgear and installation.
    Whether induction or ordinary, it makes no difference. If they have the same heating power, it means that they have to take the same (I know, I remember about losses) power from the network.
  • Helpful post
    #13 16874091
    mawerix123
    Level 39  
    Dyta wrote:
    Thank you very much for your help :)
    Does connecting "force" involve forging in the wall?
    And without these changes, would you recommend buying an induction or rather an ordinary electric cooker?
    I will be grateful for every comment


    It can be surface mounted in the slats if it does not interfere with the apartment, but on the staircase you have to agree with the manager.
    The switchgear needs to be replaced and rebuilt.
    Whether induction or otherwise, it doesn't really matter.
    What is the power allocation :?: what pre-meter protection :?:
  • #14 16874173
    Dyta
    Level 7  
    Our main plug burned out recently, it was 32 amps in front of the counter. Is that the point?
  • Helpful post
    #15 16874213
    rafbid
    Level 33  
    Dyta wrote:
    in front of the counter
    That's about him.
  • #16 16874240
    Dyta
    Level 7  
    So if we buy a 230v induction, should it be ok?
  • Helpful post
    #17 16874257
    elpapiotr
    Electrician specialist  
    Dyta wrote:
    So if we buy a 230v induction, should it be ok?

    What power if I may ask?
  • #18 16874353
    Dyta
    Level 7  
    We thought about 7600 W, but if we need less power, we will look for a smaller one. Thank you very much for your patience with the novice :)
  • Helpful post
    #19 16874430
    zbich70
    Level 43  
    Dyta wrote:
    Our main plug burned out recently, it was 32 amps in front of the counter. Is that the point?

    Probably the "main plug" preceding the one in the photo attached by my friend "burned".
    Verifying Electrical Strength in Newly Renovated Apartment: Practical Guide
    The photo is weak, but the "eye" of the insert looks gray. So 16A -> 3.7kW.
    Anyway, the base and the head support max 25A.

    It is not known what power is in the contract or how much power is currently available.
    But anyway, adding a high-power receiver can be quite backbreaking and a 7.6kW kitchen is not feasible at all without increasing the power and rebuilding the installation.

    In the forum, we can try to help a friend, but to a limited extent.
    In order to judge anything and advise in detail, one must be on the spot.
  • Helpful post
    #20 16874663
    CYRUS2
    Level 43  
    Peter134 wrote:
    Whether induction or ordinary, it makes no difference. If they have the same heating power, it means that they have to download the same (yes I know, I remember about losses) power from the network.
    Do you remember about losses so why do you write like that?
    It can consume less power - precisely because of the much lower losses.
    The induction hob will work more functionally.
    Moreover, boiling up takes much less time.

    You can buy a 7.2kW board.
    It makes sense in that you will be able to use 4 burners simultaneously.
    With less power, but 4 burners at the same time.
    4x600 = 2.4kW.
    Or, for example, 2 burners with more power.
    Your single-phase installation can draw a power of 4600W (20A) or 5750W (25A fuse).

    You have to be careful not to overload the installation.
    Because she will cut the fuse in front of the meter.
    The burners are adjustable and you can be careful.
  • Helpful post
    #21 16874900
    zbich70
    Level 43  
    CYRUS2 wrote:
    You can buy a 7.2kW board.

    And what's next? Do you have to be careful not to use it with full power? Who will remember this in a few years?
    The guests will come, the board to the max and ... dark, I can see darkness.

    However, interpersonal relationships, especially between men and women, are easier to form in the dark ... :D
  • Helpful post
    #22 16874954
    mawerix123
    Level 39  
    Dyta wrote:
    We recently burned this main plug, in front of the counter, it was 32 amps


    While this black BiWts to the left of the meter is a pre-meter protection, the MAX 25A fuse will enter its head, so it is impossible to install 32A.

    zbich70 wrote:
    Do you have to be careful not to use it with full power?


    He does not have to be careful in the opinion of some on one phase and so it will not work with full force :D -> https://www.elektroda.pl/rtvforum/topic3405944.html#16874671
  • Helpful post
    #23 16874979
    Anonymous
    Anonymous  
  • Helpful post
    #24 16875043
    mychaj
    Level 35  
    For 10 years I have been using the 7200W induction hob on the B16 protection - and on the fingers of one hand, I would count the number of times the protection worked.
    I have C25 in front of the meter after modernization.
    My album has electronics so tuned that it automatically lowers the power of the fields if I would like to fire all of them to the maximum - which, even during the holidays, my wife fails.
  • #25 16875054
    elpapiotr
    Electrician specialist  
    mychaj wrote:
    For 10 years I have been using the 7200W induction hob on the B16 protection - and on the fingers of one hand, I would count the number of times the protection worked.
    I have C25 in front of the meter after modernization.
    My album has electronics so tuned that it automatically lowers the power of the fields if I would like to fire all of them to the maximum - which, even during the holidays, my wife fails.
    Somehow I can't read what (how many phase) power supply is there to this board (?)
  • #26 16875121
    mychaj
    Level 35  
    Single-phase - from the ground floor to the 3rd floor to the switchgear in the apartment 3x4 mm / sq., Of course, on a separate 2.5 mm / sq. M cable.
  • #27 16875127
    zbich70
    Level 43  
    mychaj wrote:
    For 10 years I have been using a 7200W induction hob with B16 protection.
    On one phase? Come on, don't be kidding!
    7200W divided by 230V is over 31 amps.
    Write what "hacklife" you have come up with, you will be the master of the internet ... ;)
  • #28 16875154
    mychaj
    Level 35  
    No - it is like that all the time, earlier (my wife made me realize hehe) there was a ceramic amica for 3 years, but the controls fell and I bought a mastercook in a shop not for idiots.
    The album has the electronics tuned in such a way - 2 fields are paired, as on one dam max and on the other dam max, then it automatically lowers the first field to 5 (there are 10 levels).
    The maximum power of the field is rarely used, the wife always cooks between 5 and 8.
  • #29 16875158
    Anonymous
    Anonymous  
  • #30 16875202
    CYRUS2
    Level 43  
    zbich70 wrote:
    On one phase? Come on, don't be kidding!
    7200W divided by 230V is over 31 amps.
    The hob is not a heater for heating the apartment.
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Topic summary

✨ The discussion revolves around verifying the electrical strength in a newly renovated apartment, particularly in relation to connecting an induction hob. The user inquires about the adequacy of existing wiring and power supply, expressing concerns about whether the current setup can support high-power appliances. Responses highlight the importance of checking the number of wires near the stove to determine if there is a three-phase power supply, which is necessary for high-demand appliances. It is noted that most electric stoves operate on two phases, and users are advised to ensure that the installation can handle the required load without overloading the circuit. Recommendations include considering a 7.2kW induction hob, ensuring proper circuit protection, and possibly upgrading the electrical system if necessary. The conversation emphasizes the need for careful power management to avoid tripping fuses and discusses the implications of using single-phase versus three-phase power.
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FAQ

TL;DR: Only 27 % of Polish flats carry 3-phase 400 V supply [GUS, 2022]; an expert writes “single-phase dominates” [Elektroda, Peter134, post #16874057] Your cabinet shows single-phase; limit an induction hob to ≈5.75 kW or add 3-phase.

Why it matters: Choosing the right cooker and wiring now avoids costly re-work and blown fuses later.

Quick Facts

• Single-phase 25 A service = 5.75 kW usable power (230 V × 25 A) [Elektroda, CYRUS2, post #16875616] • Typical 3-phase upgrade fee: PLN 1,000–3,000 incl. meter swap [Energa, 2023] • Induction hob efficiency ≈84 % vs 74 % for radiant ceramic tops [DOE, 2018] • Minimum cable for dedicated hob circuit: 3 × 4 mm² Cu up to 25 A [PN-HD 60364-5-52] • Overloading a 16 A plug with 32 A can melt the base, as in the thread case [Elektroda, Dyta, post #16874173]

1. How do I know if my flat has 3-phase ("strength") supply?

Open the fuse board: a 3-phase feed shows three live conductors and usually a 4-pole RCD. The photos posted reveal only one phase and one neutral, confirming single-phase [Elektroda, Dyta, post #16874054]

2. How many wires should emerge behind the cooker outlet?

Three wires (L, N, PE) mean single-phase. Four or five (L1, L2, L3, N, PE) signal 3-phase and allow higher loads [Elektroda, jurex2, post #16874029]

3. Does adding 3-phase always require wall chasing?

Not necessarily. Surface-mounted trunking in skirting or stairwell risers can avoid chiselling, but the building manager must agree [Elektroda, mawerix123, post #16874091]

4. Can a 7.2 kW induction hob run on single phase?

Yes, if the model offers power-limiting. Set it to ≤5.75 kW to stay within a 25 A fuse; many hobs throttle automatically [Elektroda, CYRUS2, post #16874663]

5. What breaker size should protect a single-phase hob?

A dedicated B16 A–B20 A MCB on 2.5–4 mm² cable is common. Above 20 A, select C-curve to avoid nuisance trips [PN-HD 60364-4-43].

6. How much continuous power does a 25 A single-phase service provide?

230 V × 25 A = 5,750 W. Short bursts up to 30 A (≈6.9 kW) may pass before the fuse reacts [Elektroda, CYRUS2, post #16875616]

7. What happens if I overload the pre-meter fuse?

It blows or melts. The OP’s 32 A attempt on a 16 A base burned the plug and cut supply—an avoidable failure [Elektroda, Dyta, post #16874173]

8. Are induction hobs really more efficient?

Yes. Lab tests show 84 % energy transfer versus 74 % for radiant ceramics, saving roughly 10 % electricity per meal [DOE, 2018].

9. Quick 3-step check before buying a hob

  1. Count conductors at cooker point.
  2. Read main fuse rating (e.g., 25 A).
  3. Compare hob’s adjustable power range with fuse limit. If range ≤ fuse ×230 V, you’re safe.

10. Edge case: main plug burns again—what now?

Stop using the circuit, call a licensed electrician, and replace both the base and cartridge with correct amperage. Continuing use risks fire [Elektroda, zbich70, post #16874430]

11. What does a 3-phase upgrade cost and involve?

Expect PLN 1,000–3,000 for utility paperwork, new meter, and breaker board. Additional costs for riser cabling vary by distance and building rules [Energa, 2023].

13. Do I need permission to run new cables in the stairwell?

Yes. The housing cooperative or building manager must approve changes in common areas and may request licensed contractor documentation [Warsaw Housing Regs, 2021].

14. What pots work with induction?

Magnetic bases only—check with a fridge magnet. Stainless multi-layer and cast-iron pass; aluminium won’t unless it has a ferromagnetic plate [Manufacturer Guides].
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