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Induction Hob again

Former Community Member
Former Community Member
I hope that you don’t find me impudent but I am having difficulty finding an electrician to explain why they will not install the induction hob and double oven that we are looking to fit in our new kitchen.
We have chosen a hob 7.4 kW and oven 6.3 kW. The cooker radial circuit has 6mm2 cable with 40A MCB. The run is some 12 m. The house was built (converted) in 2002 and inspected last year (DPN18C). We cannot run an extra cable because the CU is separated from the kitchen without a horizontal floor or roof space and presumably runs the existing cable through the stud walls.
The kitchen fitting company electrician has visited but won’t carry out the work unless we sign an indemnity as it would invalidate our insurance and the appliance guarantee. He suggested instead two plug-in ovens which we could add to the ring main. I have contacted four other local electricians but they all use 13.7 kW means 59.7 A which means 10 mm cable and ignore my request to consider diversity.
Should I give up and accept the two oven solution or perhaps a gas oven?
Do you know of a way of finding someone who understands diversity?
Am I simply wrong?

Parents
  • davezawadi (David Stone):

    Induction hobs take power in response to the size of the pan and the temperature set, so several 'rings' at full power for long is unlikely, as is the oven being on maximum for more than 5-10 minutes.


    I take JP's point and if the manufacturer's instructions say it should be on something bigger than 6 mm², there is a problem. However, I very much doubt that they will say 6 mm², but not shared with anybody else.


    I have two cookers, an old commercial range (70 kW), which came with the house, and a commercial combination microwave (3 kW). I allow 20 minutes for the big oven to get Yorkshire pudding-hot. It's nearly Easter, so if I put in a lamb, the temperature would drop and the burners would probably go full on for another 10 minutes, by which time they will turn down and maintain the temperature. At equilibrium, the burners are only chugging along at the rate at which the insulation allows heat to escape. Similarly, once your pan of potatoes is boiling, the only heat required is to match the losses through the sides and top of the pan (+/- lid).


    I think that the OSG diversity figures are pretty reasonable.


Reply
  • davezawadi (David Stone):

    Induction hobs take power in response to the size of the pan and the temperature set, so several 'rings' at full power for long is unlikely, as is the oven being on maximum for more than 5-10 minutes.


    I take JP's point and if the manufacturer's instructions say it should be on something bigger than 6 mm², there is a problem. However, I very much doubt that they will say 6 mm², but not shared with anybody else.


    I have two cookers, an old commercial range (70 kW), which came with the house, and a commercial combination microwave (3 kW). I allow 20 minutes for the big oven to get Yorkshire pudding-hot. It's nearly Easter, so if I put in a lamb, the temperature would drop and the burners would probably go full on for another 10 minutes, by which time they will turn down and maintain the temperature. At equilibrium, the burners are only chugging along at the rate at which the insulation allows heat to escape. Similarly, once your pan of potatoes is boiling, the only heat required is to match the losses through the sides and top of the pan (+/- lid).


    I think that the OSG diversity figures are pretty reasonable.


Children
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