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32A circuit feeding hob and oven

keylevel

My hob needs replacing and I've been looking at getting an induction one rated at 7kW. Installation instructions say it needs a 32A circuit (which makes sense).

Looking at the existing install, I have an oven (~1.9kW, based on smart meter reading) and the existing hob (also 7kW) running from a shared 32A circuit.

Is this acceptable, or do I need to get the circuit upgraded?

Looking at an old copy (2004 / 16th Ed)  of the OSG, the diversity calculation seems to be:

  1. 10A + 0.3 * 20A = 16A for the cooker
  2. 8.25A for the oven.

Which would appear to be ok on a 32A circuit.

  • 0

    If it was my own I wouldn't worry about it . If it was for a customer I would recommend a 20 amp circuit  for the oven in case they have an issue at Christmas when they may use it all .

    Gary

  • 0 in reply to aligarjon

    Thanks, glad to hear as it would be a right pain to get a new cable run in!

    I've been living here for nearly 10 years with it as it is, do a lot of cooking, and haven't had any issues with the current setup.

  • 0

    If the hob and oven (I presume 2kW namplate) were supplied on one box, we'd happily calculate the demand, after diversity, at around 19A (I once found a full cooker, 4-hobs, oven & grill) running happily on a 15A rewireable - which hadn't blown despite full Xmas meals for the extended family for decades). So I'd be quite happy in terms of load. Just check the maximum protective device specified by the manufacturer for each item ... some do say 16A or 20A. (But even then a local MCB might sort that).

       - Andy.

  • 0

    Diversity applies to cookery in a number of ways.

    You do not cook everything at once.

    Once a pan is up to the required heat, you turn it down, unless you like eating cinders.

    Some items cook quicker than others, so any "overload" will be brief.

    Moreover, if you are cooking with 7 kW for any significant amount of time, your kitchen will get frightfully hot. Cold sweat

  • 0 in reply to Chris Pearson

    And as per another thread on here about cable ratings and fusing times, a '32A' circuit and breaker are perfectly good for quite a bit more in short doses, so can ride through a few minutes while the elements get up to the pinging on and off state, and if at some instant they are all synchronously on.

    Only if the cable has been compromised, perhaps by boxing in altering how well it can cool, or burning at the terminations due to poor contact should it need to be upsized.   I presume the cable is already at least 4mm2 or  a bit larger...

    Mike

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