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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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    AJJewsbury:




    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.



    Where on earth did you dig up that quote from? AFAIK that kind of thinking was dropped from the regulations decades ago - about the time we started using 13A sockets - and cooker diversity was well established even before that.


    Isn't this a bit like rating a double 13 A socket at 13 A? The rating is what it says it is.


    So I just looked up a range cooker on John Lewis's web site which specifies (for a particular model) a 45 A fuse. Note, fuse not MCB! This is for 7.4 kW @ 230 V, which by my maths is 32 A.


    However, the technical specs specify a maximum power of 14.8 kW, so clearly the manufacturer has applied some diversity.


    Oh yes, and don't install it in your bathroom. No, seriously! "The cooker may be installed in a kitchen/kitchen diner but NOT in a room containing a bath or shower." ?

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  • 0

    AJJewsbury:




    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.



    Where on earth did you dig up that quote from? AFAIK that kind of thinking was dropped from the regulations decades ago - about the time we started using 13A sockets - and cooker diversity was well established even before that.


    Isn't this a bit like rating a double 13 A socket at 13 A? The rating is what it says it is.


    So I just looked up a range cooker on John Lewis's web site which specifies (for a particular model) a 45 A fuse. Note, fuse not MCB! This is for 7.4 kW @ 230 V, which by my maths is 32 A.


    However, the technical specs specify a maximum power of 14.8 kW, so clearly the manufacturer has applied some diversity.


    Oh yes, and don't install it in your bathroom. No, seriously! "The cooker may be installed in a kitchen/kitchen diner but NOT in a room containing a bath or shower." ?

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