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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.

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    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.

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  • 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.

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