Install new oven & induction hob to existing circuit

Steve D · Mar 20, 2019

Hi All. Just a little help I need connecting a electric oven and induction hob. The existing is a 32 amp MCB in the consumer unit. A 4m run of 6mm sq t&e cable from mcb going to a 45A cooker control switch. From here a 6mm sq t&e going into cooker connection unit. I have removed the old electric oven which was connected to the cooker connection unit with 6mm sq t&e cable. I want to connect a new 2.5kw oven and a 6.4kw induction hob. I have a 45 Amp Dual Appliance / Cooker Outlet Plate which will replace the existing cooker connection unit. Is it ok to connect both appliances to the new dual appliance connection unit so they are on the same circuit. If so then what size cable do I need to connect the oven to the connection unit. The hob already has a 5 core cable with the blue and grey cable joined together at the end and the black and brown also joined together. It looks like a 3 phase cable. Any help on this will be much appreciated.
Thanx

Steve D · Mar 21, 2019

Thanks for your help John.
I actually have 2 kitchens in my property. I wouldnt run the new oven and hob at the same time as I have a 5 burner gas hob in the other kitchen.

Andy78 · Mar 21, 2019

Steve D said:
Thanks for your help John.
I actually have 2 kitchens in my property. I wouldnt run the new oven and hob at the same time as I have a 5 burner gas hob in the other kitchen.

You'd use the hob in one kitchen and the oven in another kitchen when preparing parts of the same meal ?

Steve D · Mar 21, 2019

Sorry missed the bit about the 13A plug. ill just check it.

Steve D · Mar 21, 2019

Andy78 said:
You'd use the hob in one kitchen and the oven in another kitchen when preparing parts of the same meal ?

No the oven hasnt got a 13 amp plug on it. Just the connecting block.

Andy78 · Mar 21, 2019

Steve D said:
No the oven hasnt got a 13 amp plug on it. Just the connecting block.

?

Steve D · Mar 21, 2019

Andy78 said:
You'd use the hob in one kitchen and the oven in another kitchen when preparing parts of the same meal ?

No we always cook in the other kitchen which has an oven. and a 5 burner hob
The Newly installed hob will only be used when my son cooks his fry ups. The oven in here won't run at the same time. We sometimes need to use two ovens at the same time but never two hobs at the same time.

Steve D · Mar 21, 2019

Andy78 said:
?

[ElectriciansForums.net] Install new oven & induction hob to existing circuit

John Preston · Mar 21, 2019

I understand it's your kitchen Steve however it still needs to be right electrically and to the regulations. Let's say you sell the house in the future and the new owners are not aware of the "special" arrangement of the cooker and hob. I know it all sounds a bit over the top but it is a requirement to do it right. With the cooker having no plug on it this tells me it will more than likely draw a higher current than a fan assisted plug in oven which to be honest enhances the requirement of it needing another supply. The problem also is that the cooker will be backed up by a 32amp circuit breaker when in actual fact this would be too large. It should be on it's own radial backed up with a 16amp circuit breaker. If you ran a piece of 2.5mm twin and earth through the cabinets and leave it on the coil the sparky could continue to run it to the consumer unit to finish it off. This way you could finish the kitchen but not compromise the electrical installation. The induction hob can be connected to your existing 6mm supply.

Steve D · Mar 21, 2019

So you telling me that I do need another circuit going back to the consumer unit If so then I dont think i have any more room in the consumer unit for another fuse. Just asking the question so im prepared for the extra cost of a new consumer unit and rewiring for it when my sparky comes

John Preston · Mar 21, 2019

He might be able to come off the ring (socket circuit) and use a 20A double pole switch. It's just too much combined on the one circuit with your induction hob. It caught me out when I bought an induction hob to be honest. I ended up using it in my flat and using a combined induction/gas hob in the house. It was half the power as it only had two induction rings. Shout at your sparky and tell him he's needed on the job

GeorgeCooke · Mar 21, 2019

You can run them on one circuit. Ovens and hobs never take full load continuously. They cycle on and off. Read up on diversity. The cooker is OK on the 32 amp MCB which is there to protect the cable (which you have oversized anyway as 4mm would do) not the cooker on the end of it.

Steve D · Mar 21, 2019

GeorgeCooke said:
You can run them on one circuit. Ovens and hobs never take full load continuously. They cycle on and off. Read up on diversity. The cooker is OK on the 32 amp MCB which is there to protect the cable (which you have oversized anyway as 4mm would do) not the cooker on the end of it.

Thanks for your help George.
So I can do it even though the instructions say "This appliance must be connected directly to the mains using an omnipolar circuit breaker with a minimum opening of 3mm between contacts"
Sorry about so many questions. Just want to do it right just in case my sparky doesnt get back to me soon.

telectrix · Mar 21, 2019

ovens and hobs up to a total rating of 15kW have been fine for the last 60 + years with both on a 32A MCB (6.0mm cable, ref. method withstanding). same loads, same electrickery these days in spite of the EU(rinal) woth their stupid cable colours and phantom 230V. why should it change?

John Preston · Mar 21, 2019

GeorgeCooke said:
You can run them on one circuit. Ovens and hobs never take full load continuously. They cycle on and off. Read up on diversity. The cooker is OK on the 32 amp MCB which is there to protect the cable (which you have oversized anyway as 4mm would do) not the cooker on the end of it.

Diversity:- Dance Group

Seriously though, fair enough if it's quoted somewhere that diversity is allowed for then I'll go with that.

Steve D · Mar 21, 2019

Thank you all for your help, advice and your time. You have been very helpful. Much appreciated.

Install new oven & induction hob to existing circuit

Steve D

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Steve D

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Andy78

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Steve D

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Steve D

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Andy78

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Steve D

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Steve D

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John Preston

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Steve D

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John Preston

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GeorgeCooke

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Steve D

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telectrix

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John Preston

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Steve D

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