FAQ
TL;DR: For a combined induction hob + oven labeled 9.2 kW on 3‑phase, the load is about 13.3 A; “5×2.5 mm² with a 16 A breaker will be sufficient.” [Elektroda, michcio, post #16798438]
Why it matters: This FAQ helps DIYers and homeowners pick the right 5‑core cable and protection for a hob+oven on 230/400 V 3‑phase without nuisance trips.
Quick Facts
- Nameplate power: 9.2 kW is for the whole hob+oven set, not the oven alone. [Elektroda, michcio, post #16798438]
- Typical current: ~13.3 A on 3‑phase; 5×2.5 mm² with 16 A overcurrent protection is acceptable. [Elektroda, michcio, post #16798438]
- Upsizing OK: 5×4 mm² is allowed and adds headroom/futureproofing. [Elektroda, kosmos99, post #16798614]
- Run length given in case study: 13 m from switchgear to appliance. [Elektroda, lukasz19988, post #16797843]
- Example service: User reports 25 A pre‑meter protection for this setup. [Elektroda, lukasz19988, post #16798541]
Is 5×2.5 mm² cable enough for a 9.2 kW hob + oven on 3‑phase?
Yes. At ~13.3 A three‑phase load, a 5×2.5 mm² circuit with a 16 A breaker is suitable. The forum expert noted manufacturers often supply even 1.5 mm² tails on such appliances. “5×2.5 mm² and 16 A protection will be sufficient.” [Elektroda, michcio, post #16798438]
Should I choose 5×4 mm² instead for extra safety or future upgrades?
Upsizing to 5×4 mm² is acceptable and offers thermal and upgrade headroom. One expert advised, “It should be enough, but it’s better to give 5×4.” If you already bought 5×4, you can use it without drawbacks. [Elektroda, kosmos99, post #16797866]
If I later replace the appliances with lower‑power units, can 5×4 mm² stay?
Yes. Thicker conductors remain compliant when loads decrease. The responder confirmed the 5×4 mm² can stay in place even if future equipment needs only 5×2.5 mm². [Elektroda, kosmos99, post #16797950]
Is 9.2 kW the oven alone or the entire set?
It refers to the total for the hob plus oven. A contributor clarified 9.2 kW is the whole set, which aligns with the calculated ~13.3 A three‑phase draw. [Elektroda, michcio, post #16798438]
What happens if my allocated supply is too small—will fuses trip?
Yes. With insufficient allocation or other household loads, overcurrent devices can operate during heavy cooking. As one expert warned, “You have too little power allocation for these receivers.” [Elektroda, kosmos99, post #16797950]
Do I need 25 A main protection for this installation?
A user reported 25 A pre‑meter protection with this setup. That aligns with the 9.2 kW diversified cooking load. Confirm your actual service rating with your utility or electrician. [Elektroda, lukasz19988, post #16798541]
Does a 13 m cable run change the cable size recommendation?
In the discussed case, 13 m was fine with 5×2.5 mm² and a 16 A breaker because current is ~13.3 A. Voltage drop and installation method still need an electrician’s check on site. [Elektroda, michcio, post #16798438]
How do I wire a 230/400 V 3N~ oven and an induction hob together?
Follow the nameplates. Both appliances were factory‑linked via terminal blocks in the case study. Ensure a qualified electrician terminates the 5‑core supply and sets correct links per 3N~ diagrams. [Elektroda, lukasz19988, post #16797835]
Quick how‑to: picking a cable for a hob + oven on 3‑phase?
- Read both nameplates and note total kW and 230/400 V 3N~.
- For ~9.2 kW on 3‑phase, choose 5×2.5 mm² with a 16 A breaker or upsize to 5×4 mm².
- Have a licensed electrician verify protection, links, and terminations.
[Elektroda, michcio, post #16798438]
Will running all zones and the oven at max overheat the cable?
Unlikely under correct design. Cooking loads cycle; diversity reduces sustained current. One expert noted similar UK circuits are designed for <4.5 kW because full simultaneous use is rare and brief. [Elektroda, michcio, post #16798438]
What does “5×2.5” mean in cable sizing?
It denotes five conductors, each 2.5 mm² cross‑section, commonly used for 3‑phase plus neutral and protective earth. The thread discusses choosing 5×2.5 for a 3‑phase hob and oven. [Elektroda, lukasz19988, post #16797835]
Is my stated 16.1 kW connection power relevant here?
Treat it cautiously. A moderator challenged the 16.1 kW figure and asked its source. Rely on appliance nameplates and verified service ratings instead. [Elektroda, retrofood, post #16798401]
Can 5×4 mm² solve nuisance tripping on cooking peaks?
A larger cable lowers voltage drop and conductor heating but does not raise your service limit. Trips come from protection settings and total demand. Use 5×4 mm², but review allocation if trips persist. [Elektroda, kosmos99, post #16798614]
Are these models relevant: Ariston KC 62 D0 1X hob, HO 87 EF.1 IX oven?
Yes. The poster shared these models and confirmed a 25 A service. The advice remained: 5×2.5 mm² with 16 A protection is adequate; 5×4 mm² is also fine. [Elektroda, lukasz19988, post #16798541]
Could the oven really be 9.2 kW by itself?
Unlikely per the discussion. A user questioned that label, and another clarified the 9.2 kW applies to the entire set, not the oven alone. [Elektroda, mawerix123, post #16798149]
Will an electrician likely trip the fuses during commissioning?
Under‑allocated service or simultaneous heavy loads can trip fuses during tests. One reply to the OP confirmed this outcome when asked about tripping. [Elektroda, kosmos99, post #16798264]
