I am fitting a all electric range cooker, and the current cable in kitchen is a 6mm, when calculating the maximum power useage, it would appear that if everything was turned on, it could be using 57amps will I need to change the supply cable

Yes you would. It would need to be upgraded to at least 10mm with at least 45 amp supply.

You can allow for diversity and I can't be bothered to look it up.

diversity for your cooker is first 10 amps plus 30% of the rest plus 5amp if there is a socket outlet at the cooker outlet. So that would make it 24.1A or 29.1A . The current carrying capacity of your 6mm2 cable though depends upon how it is installed and run, also what the device that is protecting it is.

Don't you think the diversity law is a bit over generous?

I wouldn't leave a stove like that on a 6mm 30 amp supply! No chance!!

If you are in a house and the 6mm cable is not in any way installed in insulation then try it and see its very unlikely the 32A cpd will ever blow. If it does then go for the upgrade.

I've actually connected one of these stoves. They've got six hob rings plus an enormous grill and oven.

Leaving it on a 32 amp circuit is only connecting to just over half of it's ability which is too low IMO

I would at least have diversity rating to a commercial stove. Not a domestic one.

Chances are the stove will never be used to its full extent in a domestic situation and with simmer stats ect the load will be up and down.

I think the OP needs to do an assesment of the likelyhood and act on his findings.

These stoves are normally inductive as well!

People don't buy them if they don't at least mean to use them at some time, for example christmas day.
If you are getting your kitchen renovated then it is worth putting another cable now.

Better safe than sorry

Very sensible I agree - no point in applying a theory if the op is cooking mega meals for 10 everyday or worrying about overload if he is on is tod and normally just eats cornflakes .

He should have done that first before buying the thing. Could have saved a few bob in the process

Just because my car will do 145MPH with 5 people in it does not mean I drive it like that normally it doing 55 with me in it.

Do you live in a house?

Is the 6mm cable running to the cooker under 16m long?

The cable is not run in thermal insulation?

If the answers to all these questions is yes then stick a 40A MCB on the 6mm cable and enjoy you Christmas Dinner of Turkey and cornflakes.

6mm cable can carry upto 47A if not run in thermal insulation.

True, but you aren't allowed to fit tyres to it specced on the basis that you won't ever drive it at 145mph, 5-up....

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I'm sorry - I can't come in to work today, the voices are telling me to stay at home and clean the guns.

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Can with bikes though...

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Kind Regards,

Dan Robinson - http://www.jenningsheating.co.uk

If you give’m choices they'll give you grief.