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Manufacterer's advice/instructions

whjohnson
Been asked to connect up a used rangemaster all-electric cooker. No rating plate but model name is 'classic 90'. It has an induction hob.

Existing cable is 6.00mm on a 32A mcb.

Phoned the manufacturer who said it would be fine, since diversity could be applied but we would have to fit a cooker switch without a built in 13a socket and uprate the mcb to 40A.

I am a little troubled to say the least.

Comments welcome.
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    John Peckham:

    `You cannot apply diversity to a single piece of equipment for sizing circuit protection and cable sizing. Diversity can be applied to individual items of equipment when considering the maximum load on a distribution circuit or an installation.


    The cable and the circuit protection should be rated for the "Plated" load or the manufacturers instructions.




    In general I agree, but not in the case of cookers. A cooker typically consists of one or two ovens, several rings and perhaps a grill. The chance of all these components being fully utilised at the same time and for more than a couple of minutes is very small and an apparently undersized cable and MCB will almost always serve well.

    If a single very large oven has a loading of 15KW then it needs a cable and MCB sized for 15Kw. If a cooker has a combined loading of 15Kw then it can use a smaller circuit.

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  • 0

    John Peckham:

    `You cannot apply diversity to a single piece of equipment for sizing circuit protection and cable sizing. Diversity can be applied to individual items of equipment when considering the maximum load on a distribution circuit or an installation.


    The cable and the circuit protection should be rated for the "Plated" load or the manufacturers instructions.




    In general I agree, but not in the case of cookers. A cooker typically consists of one or two ovens, several rings and perhaps a grill. The chance of all these components being fully utilised at the same time and for more than a couple of minutes is very small and an apparently undersized cable and MCB will almost always serve well.

    If a single very large oven has a loading of 15KW then it needs a cable and MCB sized for 15Kw. If a cooker has a combined loading of 15Kw then it can use a smaller circuit.

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