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Induction Hob Model 641 Compatibility with 6.4kW Power, 5.7kW Connected Load & Copper Installation

tedo2 88080 23
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Can I use a 6.4 kW induction hob in an apartment with a single-phase 5.7 kW connected load and 25 A pre-meter protection, and will the installation cope with it?

Not at full power: with a 5.7 kW connected load and 25 A pre-meter protection, a 6.4 kW hob is likely to overload the supply and trip the main fuse [#10478451] The hob may be usable only with its power-limiting function, for example set to about 50%, because full-power cooking can exceed what the installation can deliver [#10478451] If you want full power, the kitchen circuit protection should be upgraded to B25, and the supply cable cross-section for that circuit must match that change [#10478663] A proper solution may also require increasing the apartment’s connection power and, if available, distributing the circuits across phases; one reply notes that in a TN-S installation, moving to three phases can be as simple as adding a new wire from the meter to the switchboard and changing the supply agreement [#10488078] The hob itself can be connected as a single-phase device with two independent single-phase circuits and separate N conductors, but the overall installation still has to be sized for the load [#10480849]
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  • #1 10470120
    tedo2
    Level 9  
    Hello everyone, I'm new and of course I'm a layman, hence my question I bought a flat in a block of flats and an electrician modernized my electrical installation for copper, my fiancée came up with an induction plate, probably model 641, if I remember the power of 6.4 kW, hence my question whether this plate will work to my apartment and whether it will drag my installation.
    Facts:
    SINGLE-PHASE INSTALLATION
    5.7 kW connected load
    pre-meter protection 25 A
    kitchen circuit protected by a B20 fuse
    bathroom circumference B16
    Large room and hall B16
    Small and medium room B16
    Difference as far as I remember 30mA
    I apologize in advance for any imperfections and shortcomings
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  • #2 10470145
    hakers_95
    Level 13  
    The maximum plate power is 6.4 kW, and the connection power is 5.7 kW, how is it supposed to pull it?
    After increasing the power, you will have to make a new circuit for the plate, as you wrote yourself that you are a layman, I will not write any more, invite an electrician ;)
  • #3 10470176
    tedo2
    Level 9  
    so by accident I found an energy consumption calculator from vattenfall which calculates the power needed and consumption, and so, for example, by adding the equipment that I will use and giving an induction hob with a power of 7000 W, it converts it to 0.7 kW
  • #4 10470210
    pletwonurek2
    Level 13  
    0.7 kW is 700 W, so this calculator is not counting like that :)
  • #5 10471445
    tedo2
    Level 9  
    Not only the induction counts differently, but also check the flow water heater
  • #6 10472297
    kj1
    Electrician specialist
    Because it is probably an energy consumption calculator, not a power calculator.
    Doesn't it say kWh sometimes?
  • #7 10473463
    tedo2
    Level 9  
    This morning I called my electrician who modernized the installation and asked him if I could have an induction hob, he laughed :) and said that of course he would come to me in the next few days! So I don't know anymore ...
    The calculator counts the consumption and the required power and connection, if someone does not believe, please check :D
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  • #8 10473533
    jarecki 86
    Electrician specialist
    Quote:
    The calculator counts the consumption and the required power and connection, if someone does not believe, please check :D

    I checked - the calculator is not working :D
  • #9 10473694
    tedo2
    Level 9  
    That I ask you does not work that you do not go to connect with him or it does not work because it counts badly? :)
  • #10 10473712
    hakers_95
    Level 13  
    Quote:
    This morning I called my electrician who modernized the installation and asked him if I could have an induction hob, Smile laughed and said that of course he would come to me in the next few days!
    Either he remembers from a distance what you have there (security, connection power) and he told you so, or you gave him too little details, or you gave us bad info about power and / or overcurrent protection. Anyway, an obada will come and then you will tell us what he came up with ;)
  • #11 10478451
    Anonymous
    Anonymous  
  • #12 10478663
    jarecki 86
    Electrician specialist
    In addition to the issues raised by a colleague Bronek22 there is still a problem with any grading of security, because for full power operation of the hob, the protection of the kitchen circuit should be changed to B25, and thus the cross-section of the power supply cable for this circuit.
    After all, there is no reason to laugh at it.
  • #13 10479819
    tedo2
    Level 9  
    Well, it doesn't start interesting :| we'll see what fachman comes up with when he arrives because he was sure on the phone ...
  • #14 10480849
    Anonymous
    Anonymous  
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  • #16 10485405
    O^O
    Level 21  
    carlos-montana wrote:
    If the induction hob proves to be too heavy for your installation and when cooking on 3 or all plates it blows the fuses, you can try to install priority relays in the switchgear
    Yeah ... and later it will be:
    - Honey, turn down the TV, because I stopped cooking. :D

    Priority relays are useful for appliances whose turn-on time is of little importance to the processes they control, such as a boiler or electric stove, and not for a stove.

    Since, as colleagues have rightly mentioned, 6.4kW is too much, what is the point of buying a CD with such power? Maybe 3.5kW is enough?
  • #17 10485597
    hakers_95
    Level 13  
    Quote:
    6.4kW is too much, what's the point of buying a CD with this power? Maybe 3.5kW is enough?


    Why a 3kW kettle if 1kW will also do its job and boil water. Limiting the power of the equipment is not a solution (unless we cannot afford a new electrical installation that will cope with such loads) One thing is certain that you need to modernize the installation to some extent, if it is to work and be safe with such a load.
  • #18 10488078
    Anonymous
    Anonymous  
  • #19 14530343
    dawid198805
    Level 10  
    Colleagues, let me refresh the topic a bit. I am going to replace the gas hob with an electric one. I live in a block of plates, a single-phase meter, 4 kW connection with 20 A pre-meter protection. The maximum power consumption stated on the oven's rating plate is 2800 W, connected to a standard socket. I am thinking of buying an Amica PI6509LN board for an outlet with a maximum power of 3700 W.
    1 Does this mean that I will not be able to use the oven and the hob at the same time?
    2 Can it pull the oven and max 2 fields at the same time?
    3 What happens if the consumed power exceeds 4000 W after switching on the hob and other electrical appliances?
    4 Somewhere I read that you can connect a hob with a power of up to 7 kW but it will still work up to a maximum power of approx. 3.5 kW with such an installation because the security will work (each has such if it is true?).
    5 Has anyone measured how much power such a plate actually consumes when cooking dinner normally?
    6 Maybe it is so that even a 2 kW hob is not used in everyday cooking?
    I will be grateful for answers from people who are familiar with this topic.
  • #20 14530383
    Łukasz-O
    Admin of electroenergetics
    No sense. You give up gas for induction with only 4kW of connection power. Illogical.
  • #21 14530487
    retrofood
    VIP Meritorious for electroda.pl
    dawid198805 wrote:
    Colleagues, let me refresh the topic a bit.


    Don't refresh, look for it. Recently discussed topic several times.
  • #22 14530505
    pol102
    VIP Meritorious for electroda.pl
    And it would suffice to write, "Solomon also does not pour from empty."
  • #23 14530897
    dawid198805
    Level 10  
    I am fed up with bringing a gas cylinder to the fourth floor every two months and the induction hob is easier to keep clean and safer to use with the children I have. In addition, the safety of the cylinder is getting worse and worse, what I see in myself and hear in the information.
  • #24 14530937
    retrofood
    VIP Meritorious for electroda.pl
    dawid198805 wrote:
    I am fed up with bringing a gas cylinder to the fourth floor every two months and the induction hob is easier to keep clean and safer to use with the children I have. In addition, the safety of the cylinder is getting worse and worse, what I see in myself and hear in the information.


    Everything is correct, but you should start from the beginning, i.e. with the preparation of the electrical installation, and not with the purchase of a stove. Closing, the topic described in the forum, see the existing topics.

Topic summary

✨ The discussion revolves around the compatibility of an induction hob, likely model 641 with a power rating of 6.4 kW, in a single-phase electrical installation with a connected load of 5.7 kW. Users express concerns about whether the existing electrical setup can support the induction hob without tripping fuses. Key points include the need for potential upgrades to the electrical circuit, such as changing the kitchen circuit protection to a B25 fuse and ensuring the wiring can handle the load. Some users suggest that while the hob can be used, it may only operate at reduced power (50%) to avoid overloading the system. The conversation also touches on the importance of consulting a qualified electrician for proper installation and safety considerations.
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FAQ

TL;DR: A 25 A single-phase supply delivers only 5.75 kW at 230 V, so a 6.4 kW hob needs derating or a new circuit. “Full power means full current” [Elektroda, hakers_95, post #10470145] Why it matters: oversizing trips fuses, undersizing overheats cables.

Quick Facts

• 25 A × 230 V = 5.75 kW available on one phase [Elektroda, tedo2, post #10470120] • Typical induction hob power-limit modes: 2–50 % steps, factory set to 3.7 kW on 1 Ø Bosch Manual • Upgrading from 1 × 4 kW to 3 × 11 kW supply costs ≈ €55–€70 plus paperwork PGE-ENA Tariff 2023 • Minimum cable for 6.4 kW @ 230 V: 3 × 4 mm² Cu with B25 breaker [IEC 60364-5-52] • Loss of neutral can raise live conductor to 400 V, destroying electronics [Elektroda, Bronek22, post #10480849]

Can I run a 6.4 kW induction hob on a single-phase 25 A supply?

Not at full power. Your 25 A main fuse allows 5.75 kW; exceeding it trips the pre-meter protection [Elektroda, Anonymous, post #10478451]

What happens if I ignore the limits and cook on all zones?

The main 25 A fuse will blow after a short period; worst-case, overheated conductors cause insulation damage [Elektroda, Anonymous, post #10478451]

Do induction hobs include power-limit settings?

Yes. Most models let you cap total draw to 3.7 kW or 2.5 kW in software Bosch Manual. Setting 50 % kept cooking functional for one user [Elektroda, Anonymous, post #10478451]

Is switching to a 3-phase connection hard?

Usually not. You run a 5-wire cable from meter to board and file a power-upgrade request; Polish utilities charge ≈ €60 PGE-ENA Tariff 2023. "Just a new wire" one poster noted [Elektroda, Anonymous, post #10488078]

Can I use a 3.7 kW hob plus a 2.8 kW oven on 4 kW supply?

No. Simultaneous use can exceed 4 kW and trip the 20 A fuse [Elektroda, dawid198805, post #14530343] Limit cooking to one appliance or upgrade supply.

How much power does normal cooking draw?

Routine simmering uses 800–1200 W per zone; boiling peaks at 2 kW. Average family dinner stays below 3 kW EnergyStar 2022.

What’s the dangerous edge-case with induction hobs?

A lost neutral can raise the chassis to 400 V, frying control boards. Dual-neutral designs reduce this risk [Elektroda, Bronek22, post #10480849]

How do I safely add a new hob circuit?

  1. Pull 3 × 4 mm² Cu cable from switchboard to hob.
  2. Fit a B25 type C16A RCBO (30 mA) for combined overcurrent and RCD.
  3. Program hob’s max-power if supply remains single-phase. This meets IEC 60364 wiring rules.
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