Induction Hob and Oven on single 6mm cable query

28 Jan 2011
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United Kingdom
Just moved into a new house (to me, 16th edition) and discovered the following:

A 6 mm cable from the consumer unit (MCB side) on a 32 Amp RCD goes into kitchen about 9 meters of cable - the first 7 meters is clipped to the joists and not covered in the garage and then the final 2 meters is in the wall and plastered over. The cable goes into a cooker isolator switch and then into a double cooker connection unit under the worktop. The induction hob and oven are both wired to this.

The hob is max rated at 7.2 Kw and the oven max rated at 4.8 Kw.

I'm not a sparky - but this doesn't seem right

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If its OK, i'll leave it as is - just worried cos some of the other electrics in the house are a bit, errrrrr 'ropey' lol and was most worried about this particular aspect

thanks for your reply
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Personally, I think the hob and oven should be on two separate radials, each on 6mm cable.
That really isn't necessary. Your 12kW total load (undoubtedly quoted at 240V) is considered to be a load of about 21.4A (at 230V) after applying 'diversity' (which takes into account the fact that not all parts of the cooking appliances will be drawing power simultaneously for significant periods of time). 21.4A is obviously well within the capabilities of a 32A MCB, and 6mm² cable, installed as you have described, can safely carry 47A, so that's obviously fine as well.

Kind Regards, John

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