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We have a cooker circuit that is 6mm T/E, on a 32A MCB. Because of the layout it would be prohibitively costly to replace this with 10mm T/E. Our existing range cooker is dual fuel but with mixed gas and electric hobs; we have tended to use the electric hobs much more than the gas ones. It has a quoted max power of 10kw, and we have never had any problems with the MCB tripping. It’s broken, so we need a new one.
We would prefer an all electric new one (ceramic hobs, Rangemaster 110). This would have a quoted max power of 16kw. The manufacturers web site just says that 6mm/32A is OK but 10mm/45A will offer ‘more flexibility’ and to consult a qualified electrician. I have paid for advice from 2 electricians, both of whom were reasonable, but cannot really guide me: The situation is that it is permissible under regulations (and safe) to connect such a cooker to our 32A supply (so long as the switch has no power socket), but there is the possibilty that, if too many ovens, grill and hobs are on at the same time, it could trip the MCB – a nuisance but not dangerous. Neither of the electricians could really tell me how often this might happen.
Is there anybody who has experience of such a cooker on such a circuit, who can say whether in practice nuisance tripping of the MCB is a real problem?
Re: Electric range cooker on 32A circuit
had a quick look on the rangemaster site but cant seem to find this info where did you see it ?
all the instruction book says it should be according to BS7671Dave
Re: Electric range cooker on 32A circuit
Hi
With the rangemaster induction hob you will need the 45amp 10mm2 cable due to the possibility of using all the functions at once so yes it will need to be changed.
Bryan
Re: Electric range cooker on 32A circuit
The ones we are looking at are ceramic, not induction. Changing to 10mm is not an option, I’m afraid.
The page that shows the advice on wiring is http://www.rangemaster.co.uk/rangemaster-owners/faqs, second answer down. To save you looking it says:
Q. What power supply do I need to install my cooker?
Please ensure your fitters refer to the fitters guide before installation.
Ceramic and Induction models may be connected to a suitable 6mm cable with a 32-amp breaker (providing the isolator switch, which turns the power on and off to the cooker, does not incorporate a 13 amp socket). However to provide greater flexibility, we recommend a 10mm cable with a 45 amp breaker.
Note:
These are guidelines and other factors may alter the cable/breaker power. Therefore we cannot provide electrical information as the qualified electrician has to make calculations based on what is around the cooker e.g. boilers etc.As I said above, 2 qualified electricians have visited and confirmed that the cooker can safely be connected, within the regulations – but they don’t know whether the cooker will frequently or infrequently trip the MCB.
Re: Electric range cooker on 32A circuit
what they are getting at is how its used.
if you have 15 people round for dinner you are more likely to use all the elements at once thereby overloading the circuit but if you only cook for 3 you probably wont use all the elements
To be safe you need to wire for total load which unfortunately is 10mm 45ADave
Re: Electric range cooker on 32A circuit
Stick with a dual fuel appliance is your best option then. And if/when the power goes out at least you’ve got the gas to cook with :tup:
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