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Cable Cross-Section for Induction Hob & Oven: 5x2.5 or 5x4, 20m Distance, 2F+1F Device Power

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  • #1 16966217
    1.b
    Level 13  
    Posts: 231
    Help: 5
    Rate: 70
    Hello colleagues, pick up the cable cross section, use 5x2,5 or 5x4 to power the induction hob and oven together (2f + oven 1f), the power of the devices is not known yet and the cable needs to be placed from the 20m switchgear, the cable will be placed in the shell in the façade ( styrofoam) thanks in advance.
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  • #2 16966232
    zdzichra
    Level 32  
    Posts: 1531
    Help: 167
    Rate: 303
    5x4 certainly does not hurt, especially because it is supposed to be under the styrofoam, or in difficult cooling conditions.
  • #3 16966238
    elpapiotr
    Electrician specialist  
    Posts: 12199
    Help: 1013
    Rate: 3508
    Hello.
    Why are you going to lay a cable, you'll also ... buried it?
    Give the YDY 5 x 4 mm? cable for peace of conscience :D
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  • #4 16966333
    mawerix123
    Level 39  
    Posts: 4143
    Help: 482
    Rate: 949
    Arrange the YDY5x2.5mm2 cable to the plate and the YDY3x2.5mm2 oven as these are two different devices.
  • #5 16966341
    nuszek
    Level 30  
    Posts: 1421
    Help: 123
    Rate: 388
    elpapiotr wrote:
    Give the YDY 5 x 4 mm? cable for peace of conscience :D

    Not for the peace of conscience, it is only to be.
    Assuming that someone can install a full induction cooker with four burners, eg Bosch, it has almost 10 kW, and the oven is 2 kW, so we have 12 kW. Thus, the current is about 24 A. / For the abbreviation power in kW x 2 = current in A with three-phase power supply /.
    Often, induction hobs are powered by only two phases? from the third power the oven.
    It is assumed that for 2.5 mm? it is 16 A - that is not enough.
    Even if we buy an economical plate, which will have only 6 kW + 2 kW oven, we still have 8 x 2 = 16 A, i.e. on the border.
    ps. I omit thermal conditions and styrofoam.

    Moderated By Łukasz-O:

    If the oven and induction hob are separate receivers, they should not be supplied from one circuit.

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  • #6 16966416
    zdzichra
    Level 32  
    Posts: 1531
    Help: 167
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    nuszek wrote:
    10 kW, for this 2 kW oven, we have 12 kW. Thus, the current is about 24 A. / For the abbreviation power in kW x 2 = current in A with three-phase power supply /.

    From where I can hear such a shortcut, I can expand my thought based on the formulas because it seemed to me that three-phase power is used to reduce the current in one conductor.
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  • #7 16966456
    kkas12
    Level 43  
    Posts: 17356
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    zdzichra wrote:
    10 kW, for this 2 kW oven, we have 12 kW. Thus, the current is about 24 A. / For the abbreviation power in kW x 2 = current in A with three-phase power supply /.
    You have not heard much :)
    Because this is a way to calculate the rated current (or at least very similar to it) of an induction three-phase motor.
    Power (motor) x2 = In (motor).
  • #8 16966511
    nuszek
    Level 30  
    Posts: 1421
    Help: 123
    Rate: 388
    zdzichra wrote:
    From where I can hear such a shortcut, I can expand my thought based on the formulas because it seemed to me that three-phase power is used to reduce the current in one conductor.


    P = ?3 * U * I * cos (? ;)

    Stand with the formula U = 400, cos (? ;) = 0.722

    P = I * 500 take into account that P is in kW, and I in A, 1000/500 = 2 and we have that I (A) = 2 * P (kW)
  • #9 16966551
    mawerix123
    Level 39  
    Posts: 4143
    Help: 482
    Rate: 949
    nuszek wrote:
    Stand with U = 400


    Why U = 400 if we do not have devices for this voltage :?: You are not doing something in this direction.
  • #10 16966604
    1.b
    Level 13  
    Posts: 231
    Help: 5
    Rate: 70
    no, so my friend 'elpapiotr' wrote to me, I will dig it in but styrofoam ;) hehe. That is, this 5x4 would fit to give.
  • #11 16966622
    elpapiotr
    Electrician specialist  
    Posts: 12199
    Help: 1013
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    It would be nice to give one that's what friends mentioned.
    One device - one cable.
    Two devices - two wires.

    Anyway, a similar topic was not so long ago. Just search the forum.
  • #12 16966644
    zdzichra
    Level 32  
    Posts: 1531
    Help: 167
    Rate: 303
    nuszek wrote:
    P = ?3 * U * I * cos (? ;)

    Stand with the formula U = 400, cos (? ;) = 0.722

    P = I * 500 take into account that P is in kW, and I in A, 1000/500 = 2 and we have that I = 2 * P

    Ok, but it's not an engine. With an even load distribution, you have 4kW, 16A is output to the phase with U = 230V, assuming a resistive load.
  • #13 16966658
    1.b
    Level 13  
    Posts: 231
    Help: 5
    Rate: 70
    ok is 5x2,5 plate and 3x2,5 oven
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Topic summary

✨ The discussion revolves around selecting the appropriate cable cross-section for powering an induction hob and an oven from a distance of 20 meters. Users debate between using a 5x2.5 mm² or a 5x4 mm² cable, considering factors such as power requirements, installation conditions (specifically under styrofoam), and safety. It is suggested that a 5x4 mm² cable is preferable due to potential high power demands, especially if the induction hob can reach up to 10 kW and the oven 2 kW, totaling approximately 12 kW and requiring around 24 A. The conversation also touches on the importance of using separate cables for different devices and the implications of load distribution on current ratings.
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FAQ

TL;DR: Use two circuits for two appliances; “One device – one cable.” For insulated runs, 5×4 mm² is the safer pick. [Elektroda, elpapiotr, post #16966622]

Why it matters:** This prevents overloads, eases installation, and matches how modern induction hobs and ovens are wired at home kitchens.

Quick Facts

Should my hob and oven share one circuit?

No. Run a dedicated circuit to each appliance. As one expert put it, “One device – one cable.” This simplifies protection and avoids overload. [Elektroda, elpapiotr, post #16966622]

What cable cross‑section is recommended under styrofoam insulation?

Use 5×4 mm² for the hob feed when the cable is in insulation or other poor cooling conditions. The larger section reduces heating and voltage drop risk. [Elektroda, zdzichra, post #16966232]

What wire sizes did the thread recommend for separate devices?

Route YDY 5×2.5 mm² to the induction hob and YDY 3×2.5 mm² to the oven. This aligns with common domestic layouts and keeps circuits independent. [Elektroda, mawerix123, post #16966333]

Is 5×2.5 mm² enough if my hob and oven together draw high power?

2.5 mm² is typically paired with 16 A protection. That can be marginal for combined high loads, leading to nuisance trips or overheating. Consider upsizing and separating circuits. [Elektroda, nuszek, post #16966341]

Do some hobs use two phases while the oven uses one?

Yes. Many induction hobs are two‑phase, with the oven on the third phase. Keep them on separate circuits to meet guidance and manage load. [Elektroda, nuszek, post #16966341]

What quick plan should I follow before pulling cables?

  1. Decide separation: hob and oven each get their own circuit.
  2. Size for routing: choose 5×4 mm² if in insulation; otherwise follow nameplate.
  3. Terminate and label each device feed individually at the board. [Elektroda, elpapiotr, post #16966622]

Is choosing YDY 5×4 mm² a safe ‘peace of mind’ option?

Yes. Running YDY 5×4 mm² to the hob is a conservative, accepted choice that covers many plate configurations and routing scenarios. [Elektroda, elpapiotr, post #16966238]

What did the original poster finally choose?

They confirmed 5×2.5 mm² for the plate and 3×2.5 mm² for the oven after feedback. This reflects the separate‑circuit approach. [Elektroda, 1.b, post #16966658]

How far was the switchgear from the appliances in the case discussed?

About 20 m. Longer runs increase voltage drop and make larger cross‑sections more attractive, especially in insulation. [Elektroda, 1.b, post #16966217]

Does the ‘Power ×2 = current’ shortcut apply here?

No. That rule of thumb relates to motor current. It’s not intended for kitchen circuit sizing. “Power ×2 = In (motor).” [Elektroda, kkas12, post #16966456]

Are there any typical power figures to keep in mind?

Some four‑zone induction hobs approach ~10 kW, and ovens around ~2 kW. Plan circuits so neither device stresses a 16 A line. [Elektroda, nuszek, post #16966341]

Can both appliances be supplied from one breaker if total power seems low?

Avoid that. The forum’s moderation states separate receivers should not share one circuit. It’s safer and clearer for protection. [Elektroda, Łukasz-O, post #16966341]

What if the cable runs through insulation and a hot kitchen wall?

That’s an edge case with reduced cooling. Favor 5×4 mm² to keep conductor temperatures within safe limits and maintain headroom. [Elektroda, zdzichra, post #16966232]
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