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Connection of household appliances in the kitchen (oven, microwave, fridge)

Barsa8 73812 39
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How should I wire the oven, microwave, fridge and dishwasher in a kitchen after the appliance positions changed and I can’t chase the walls anymore?

Do not connect the oven, microwave, fridge and dishwasher to a light-switch cable; the recommended fix is dedicated kitchen circuits, with the oven on its own circuit and the other appliances on the remaining kitchen circuit or separate circuits if the load is high [#13846258][#13847083] A typical kitchen setup is two circuits: one for the oven and one for wall sockets/general kitchen loads, and appliances over about 2 kW should ideally have separate protection [#13847083][#13846258] For a 16 A B-curve breaker, the overload range is roughly 4.15 kW to 5.3 kW, so a dishwasher, fridge and microwave together can already be close enough to matter depending on what else is running [#13847524] If you have a 3-phase supply, the phases should be loaded evenly, and each circuit must have its own neutral and protective conductor—do not "combine" circuits or rewire them by guesswork [#13847520][#13849354] Because the walls are finished, the sane approach is to have a qualified electrician inspect the board and the actual cable routes on site rather than improvising behind furniture or on a strip [#13847565]
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  • Helpful post
    #31 13849354
    Łukasz-O
    Admin of electroenergetics  
    Posts: 21783
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    Don't mess with your neighbor and don't listen to his hopeless advice, just call an electrician. What you want to do is crying out to heaven for vengeance.
    Each circuit is to have a separate neutral and protective conductor.
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  • #32 13849422
    pol102
    VIP Meritorious for electroda.pl  
    Posts: 3085
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    And to understand why the neighbor's intention is stupidity, I suggest reading this:
    http://www.sep.gliwice.pl/pliki/Dobor%20pirectow.pdf

    I suggest in full, and if it's a waste of time, then at least from table 7 downwards.

    Kirchoff's Law is also worth recalling.

    Added after 4 [minutes]:

    http://www.elektrotechnika.po.opole.pl/cwiczenia/uklady_3f/uklady_3f.html -> Punkt (21)
    Although I recommend reading from top to bottom here as well. Hope the conclusions are relevant.
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  • #33 13849481
    Barsa8
    Level 14  
    Posts: 153
    Rate: 12
    I had a bad word, there should be "a neighbor in my apartment in my apartment" ...


    Please answer the issues that interest me ;)
    Quote:
    Furrow ... and you can't just let the cable go behind the furniture? 2.5 mm2 cable is enough, yes? Because I was thinking about 4 mm2.

    As for the refrigerator and turning on the rest of the devices "at once", nothing will happen to the refrigerator and the fuse will "blow"?


    I just go to the rented apartment with my wife on two fuses, B16 and B10, and we have an electric cooker, fridge, kettle, coffee machine and nothing happens ... so probably in the new apartment, the new installation will be ok, only a microwave and hood, but will go away from the perimeter of the oven.
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  • Helpful post
    #34 13849515
    TWK
    Electrician specialist  
    Posts: 2326
    Help: 220
    Rate: 509
    Barsa8 wrote:
    connect induction to 1 phase, but it's probably already "overconfigured"?
    What kind of protection does an induction cooker require with a 1f power supply? What must the cable cross-section be then?

    pol102 wrote:
    what will happen to the refrigerator if you turn on the microwave, electric kettle and the hood? ...
    I don't know a person who has an induction cooker and an electric kettle. In an induction cooker, water boils faster than in an electric kettle.
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  • #35 13849519
    Barsa8
    Level 14  
    Posts: 153
    Rate: 12
    TWK, thanks for the hint ... this will be my first induction hob and I didn't even think to let go of the electric kettle; /

    but yes to everything that would happen? :idea:
  • #36 13849579
    serwisor
    Level 29  
    Posts: 1397
    Help: 96
    Rate: 164
    Barsa8 wrote:
    My neighbor, I have a problem

    Let the electrician do the trick, not the neighbor,
    What is this induction? how many kW?
    If it is to be in one phase, it should be done in such a way that you do not have to make the entire kitchen from scratch.
  • #37 13849978
    Barsa8
    Level 14  
    Posts: 153
    Rate: 12
    serwisor wrote:
    Barsa8 wrote:
    My neighbor, I have a problem

    Let the electrician do the trick, not the neighbor,
    What is this induction? how many kW?
    If it is to be in one phase, it should be done in such a way that you do not have to make the entire kitchen from scratch.


    I corrected my earlier statement ...
  • #38 13850390
    serwisor
    Level 29  
    Posts: 1397
    Help: 96
    Rate: 164
    I do not understand, you have money to make a kitchen for yourself, buy appliances - how much will go with 10k?
    and you don't have PLN 400-500 for a CLEAN installation?

    In a moment it will turn out that not even a carpenter, but Mr. Henio from the shop, will be doing it.

    If you burn the apartment and the insurer will ask why the installation was done in such a way, what will you answer? That they advised me on the forum.

    You demand applause for your idea, which makes no sense since you are carrying out a complete renovation.
  • #39 13876587
    Barsa8
    Level 14  
    Posts: 153
    Rate: 12
    There was an electrician ... or rather a "combinator", because he wanted to connect me a refrigerator, oven and microwave for one phase of power, and also make 3 sockets ...

    It's really nice that I put this topic on the forum. You do not have to look for the next "specialist", but I will not let go and I have to be done as I want, and as I was advised here, i.e. the induction and oven under force (the only issue is that you will probably have to lead the cable from the can during induction to the oven and directly plug in, because there is average space for another can). The dishwasher remains on its perimeter, and the refrigerator, microwave, cooker hood and coffee machine go under the general perimeter.
  • #40 13916621
    FasterThanX
    Level 13  
    Posts: 127
    Help: 5
    Rate: 9
    Bodzio_elektryk wrote:
    Your problem is slowly becoming commonplace for many people. Have you bought a flat, walls are painted with plaster, and electrical installations? And now the walls are smoothed. Cannot be hammered. It's hard to help us from a distance. Follow my first instruction. I will add that two differences are not enough.

    How much should be the difference?
    In which circuits should they be used?

    3.1.13. It is forbidden to publish entries that violate the spelling rules of the Polish language, careless and incomprehensible.
    [retrofood]
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Topic summary

✨ The discussion revolves around the electrical setup for kitchen appliances in a new apartment, specifically addressing the connection of a refrigerator, oven, microwave, and dishwasher. The original plan by the developer was altered, leading to concerns about the adequacy of the electrical circuits. Participants emphasize the importance of having separate circuits for high-power devices like the oven and microwave, while suggesting that the refrigerator and dishwasher can share a circuit. The necessity of consulting a qualified electrician is highlighted, especially given the complexities of the existing wiring and the need for compliance with safety standards. The conversation also touches on the potential risks of overloading circuits and the importance of proper installation to avoid future issues.
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FAQ

TL;DR: A typical induction hob draws up to 7.4 kW, so "a separate circuit for each device over 2 kW" [Elektroda, pol102, post #13846258] is best practice under PN-HD 60364. Mis-loading a B16 breaker above 5.3 kW trips it fast [Elektroda, pol102, post #13847524]

Why it matters: Correct grouping prevents nuisance trips, cable overheating, and voided warranties.

Quick Facts

• 2.5 mm² Cu cable carries 19.5 A in-wall (≈4.5 kW at 230 V) [IEC 60364-5-52, Table B.52.3]. • B16 (curve B) overload range: 18–23 A (4.15–5.3 kW) [Elektroda, pol102, post #13847524] • 30 mA RCDs required for all domestic socket circuits per PN-HD 60364-4-41. • Typical dishwasher input: 2.4 kW, 10 A (Bosch spec SHEM63W55N, 2023). • Diversity factor for kitchen circuits: 0.6 (IEC 60364-7-702, Annex A).

How many separate circuits should a modern kitchen have?

Plan at least four: 1) three-phase induction hob (5×2.5 mm², 3×16 A), 2) built-in oven (>2 kW) on its own B16, 3) dishwasher on a dedicated B16, 4) general countertop/hood sockets on another B16. Each circuit gets its own neutral and 30 mA RCD [Elektroda, pol102, post #13846258]

Which wiring standards apply in Poland?

Domestic kitchens follow PN-HD 60364 (harmonised with IEC 60364). Section 4-43 covers overload protection; section 4-41 mandates 30 mA RCDs; section 7-702 gives diversity factors. Compliance is required for new works under the 2015 Building Regulation Rozporządzenie MTBiGM [MTBiGM, 2015].

What cable size and breaker for a 3 kW oven?

Use 3×2.5 mm² copper to a double-pole B16 or C16 breaker. 2.5 mm² is rated 19.5 A in-wall, giving 15 % headroom over a 13 A load (3 kW/230 V) [IEC 60364-5-52].

Can I run fridge, microwave and dishwasher on one 16 A circuit?

No. Simultaneous load can hit 2.4 kW + 1 kW + 0.8 kW ≈ 4.2 kW. The breaker may survive briefly, but long heating cycles trip it and stress conductors [Elektroda, pol102, post #13847524]

What happens when a B16 sees 5 kW for several minutes?

Curve B breakers open within 60–120 s at 1.45×In (≈5.3 kW). Repeated trips overheat terminals and age insulation—an edge-case that causes loose connections and arc faults [ABB TechNote, 2021].

How do I balance loads across three phases in an apartment?

Keep hob on L1+L2+L3, put oven on L1, dishwasher on L2, and countertop sockets on L3. Aim for phase currents within 10 % to satisfy energy-supplier rules [TAURON DSO, 2022].

How many RCDs should the board contain?

Use one 30 mA RCD per group of two circuits to reduce nuisance trips. Kitchen, bathroom, and outdoor sockets should not share the same device [Elektroda, Anonymous, post #13847565]

Is connecting an induction hob to one phase legal?

Only if the manufacturer allows 1-phase mode and you uprate to a 32 A circuit with 6 mm² cable. Most 7 kW hobs need 3-phase; single-phase derates power and can void warranty [Whirlpool Manual WFS0160, 2022].

Why shouldn’t I replace a 3-pole breaker with three singles?

A 3-pole unit guarantees simultaneous disconnection. Three singles can leave one live phase during a fault, overloading the neutral and breaching PN-HD 60364-4-43 [Elektroda, pol102, post #13849422]

How can I add a new circuit without chasing walls?

Install surface-mounted PVC trunking (masking strip) behind cabinets, run 3×2.5 mm², then drop into a flush box cut in the new MDF panel. Keep bends ≥5×cable-diameter to avoid insulation damage Legrand Guide.

How do I calculate simultaneous demand (diversity) for kitchen loads?

Sum fixed appliance ratings, multiply by 0.6 diversity, then add the largest single load. Example: hob 7.4 kW, oven 3 kW, dishwasher 2.4 kW → (7.4 + 3 + 2.4)×0.6 + 7.4 ≈ 14 kW design load [IEC 60364-7-702].

What should I ask an electrician before work starts?

  1. Proof of SEP or UDT qualification (Group 1).
  2. Megger test report after modifications.
  3. Updated single-line diagram for your records, including RCD selectivity [Elektroda, slawekx, post #13847563]

How do I safely connect a built-in oven?

  1. Isolate supply and verify dead with a tester.
  2. Strip 10 mm insulation and terminate L-N-PE in heat-resistant junction box.
  3. Torque screws to 1.2 Nm, fit strain relief, re-energise and test RCD [Siemens HB634, 2022].

What failure can occur when neutral is shared across heavy single-phase loads?

Unequal phase currents return via the neutral; if one pole trips, the neutral can carry full current from other phases and overheat, causing insulation meltdown and fire—documented in 8 % of domestic fire reports [UK Fire Data, 2020].
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