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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.




    Fair point!


    If you were silly enough to turn on every single part of the cooker in one go, it would indeed draw gazillions of amps.


    Problem in the OP is that there is no plate.


    I fear that the problem is that one-upmanship encourages the manufacturers to declare the maximum possible power. However, it is perfectly reasonable for them to specify a smaller cable in the small print than may otherwise be expected.

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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.




    Fair point!


    If you were silly enough to turn on every single part of the cooker in one go, it would indeed draw gazillions of amps.


    Problem in the OP is that there is no plate.


    I fear that the problem is that one-upmanship encourages the manufacturers to declare the maximum possible power. However, it is perfectly reasonable for them to specify a smaller cable in the small print than may otherwise be expected.

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