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Is this cable suitable for connecting a 4kW double-oven to a 32A supply?

Discussion in 'Electrics UK' started by itm2, 22 Dec 2019.

  1. itm2

    itm2

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    I'm looking for electrical cable to connect a double oven to a 32A supply. The oven is rated at 4kW. Can anyone advise on whether this would be suitable? It's longer than I need, but the shortest that I could find in screwfix (which is my nearest outlet):

    https://www.screwfix.com/p/prysmian-6242y-twin-earth-cable-6mm-x-10m-grey/29733
    PRYSMIAN 6242Y TWIN & EARTH CABLE 6MM² X 10M GREY
    Brand Prysmian
    Cable Code 6242Y
    Cable End Type Bare
    Cable Length 10 m
    Cable Product Type Twin & Earth
    Cable Profile Flat
    Cable Voltage Rating 300/500 V
    CE Standard (Tested to EN...) BS 6004.
    Coil or Drum Coil
    Colour Grey
    Conductor Area 6 mm²
    External Diameter 13.1 mm
    Indoor/Outdoor Usage Indoor
    Manufacturer Guarantee 1 Year Guarantee
    Maximum Operating Temperature 70 °C
    Minimum Operating Temperature -15 °C
    Model No 20147221
    No. of Cable Cores 2-Core
    No. of Strands Per Core 7 Strands Per Core
    Pack Size 1
    Parent Colour Grey
    Pieces in Pack/Case 1
    Product Type PVC Flat Wiring Cable
    Sheath Colour Grey
    Supplier Manufacturer Helpline 08457 678 345
     
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  3. EFLImpudence

    EFLImpudence

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  4. itm2

    itm2

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    Will a 2.5mm cable be adequate for a 4kW oven?
     
  5. winston1

    winston1

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    Yes. 4kW is just over 20A, but not for long as ovens cycle on and off. 2.5mm cable is good for 27A.
     
  6. Ragnar_AT

    Ragnar_AT

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    I get 17.4A for 4 kW at 230 V. Did I miss anything?
     
  7. EFLImpudence

    EFLImpudence

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    Sort of and not really.

    It will most likely be quoted at 240V.

    4kW @ 240V is in fact 16.7A which will be

    3.68kW @ 230V and 16A (which is probably not a coincidence)

    because the resistances of the oven are the constants - 14.4Ω, current and voltage are variables.
     
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  9. very_pointy_ears

    very_pointy_ears

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    But if the OP is going to use 2.5mm T+E then they need to know to use a breaker rated at less than 32A
     
  10. OwainDIYer

    OwainDIYer

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    Not necessarily. An oven is a fixed load which is unlikely to overload, and a 32A will probably still provide short-circuit protection. This must be proved by calculation.

    A larger cable would be prudent though, to allow for an appliance with a heavier loading in future.
     
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  11. EFLImpudence

    EFLImpudence

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    I expect he's done it by now.
     
  12. very_pointy_ears

    very_pointy_ears

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    I'm not an electrician by trade but I would personally feel more comfortable using 6mm2 cable for this. Better to reasonably over-engineer than under-engineer in my (admittedly non-expert) view.
     
  13. very_pointy_ears

    very_pointy_ears

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    Oh blimey I didn't notice that post was so old - it was showing at the top of the forum list so I assumed it was new ...
     
  14. EFLImpudence

    EFLImpudence

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    There really is no need.

    1.5mm² is adequate for 16A.
     
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