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BIG BIG Range Cooker.

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I wired up a big range cooker today in a new house. 14kW ish. A 32 Amp 6.0mm2 circuit. Final meter of T&E in 4.0mm2. The big worry is that we could not find a cooker switch on the wall anywhere, just the cooker connection plate. Perhaps not needed by the Regs. nowadays, but nice to turn off when cleaning the cooker, servicing it or in case of emergency, or last thing at night to stop children fiddling.


I warned the owner that it is not a good idea to turn on all ovens and hobs at once.


Z.
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    AJJewsbury:

    14kW of cooking appliance, after the usual diversity rules comes out at 25.26A - so 32A should be fine - you could even add a socket!

        - Andy.


    I am sure that when the "diversity" rules were considered initially for cooking appliances, the cookers were rated at about 6kW max. This beast is over twice the rating of most stand alone four ring, grill and oven cookers of the 1950s.


    Edit. Add: The I.E.T's Electrical Installation Design Guide says about "diversity": Referring to Table 3.2, "The allowances for diversity in Table 3.2 (Table A2 of The Onsite Guide)  are for very specific situation and can only provide guidance. The figures given in the table may have to be increased or decreased, depending upon particular circumstances."


    This table includes the ancient cooker diversity calculation of:


    10 Amps. plus 30 per cent of full load cooking appliances in excess of 10 Amps plus 5 Amps. for a socket outlet. O.K. perhaps for a 1960s small 6kW cooker.


     


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  • 0
    AJJewsbury:

    14kW of cooking appliance, after the usual diversity rules comes out at 25.26A - so 32A should be fine - you could even add a socket!

        - Andy.


    I am sure that when the "diversity" rules were considered initially for cooking appliances, the cookers were rated at about 6kW max. This beast is over twice the rating of most stand alone four ring, grill and oven cookers of the 1950s.


    Edit. Add: The I.E.T's Electrical Installation Design Guide says about "diversity": Referring to Table 3.2, "The allowances for diversity in Table 3.2 (Table A2 of The Onsite Guide)  are for very specific situation and can only provide guidance. The figures given in the table may have to be increased or decreased, depending upon particular circumstances."


    This table includes the ancient cooker diversity calculation of:


    10 Amps. plus 30 per cent of full load cooking appliances in excess of 10 Amps plus 5 Amps. for a socket outlet. O.K. perhaps for a 1960s small 6kW cooker.


     


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