Discuss Oven / Cooker Hob Diversity Question in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

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Hi,

I would appreciate some views on the following issue I have.

The Cooker radial in a house has been wired in 2.5mm T&E, to save the expense of a larger cable. Without boring with the detail, I cannot pull out and replace the existing cable, nor wire in a new 32A circuit using another route. I know that sounds strange but trust me that the house has been modified in such a way as to make it only possible by running a cable round the front/side and rear of the house, and nobody really wants to go down that route.

Owner installed a 2.7kw electric oven with a gas hob that takes a 5A supply for lighting the rings. The oven is hard wired into a fused 13A outlet. The gas hob 5A supply is wired directly into the control switch on the kitchen wall (!) . A double socket has also been spurred off the circuit. The whole cct is protected by a 24A MCB

The desire is to replace the gas hob with a new 6kw electric hob. The new electric hob is one of the new ones which split the load via two separate 16A supplies, or if the two leads are connected, then via one 32A supply, therefore normally not a problem if you have a 32A cct, however in this case we don't.

Question is, can the new electric hob be accommodated on the existing 2.5 T&E cct with 24A MCB ?

Our total calculated cooking load is Oven 11A and Hob 26A = 37A

Looking at the diversity rules (Tables A1 and A2 in OSG) as I understand them (the harder you look the less clear they become !) diversity becomes 10A plus 30% of final load of connected cooking appliances in excess of 10A = 30% of 27A (11-10 + 26) = 8A

So 10A + 8A + 5A =23A, which should work IF my maths and understanding is correct, however it is pushing a 24A MCB to the limit.

So as I said at the start I would appreciate views on the feasibility of doing this.
 
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