17kw range one requires 32amp fuse, the other 45amp?

[DaMekon]

Bit confused as to why 2 different ranges that have identical power consumption require 2 different fuses?

It seems all of the rangemasters state they require 45amp for 17kw appliance, yet belling & stoves state a 32amp is sufficient for the same rating...

If they state the same power consumption of 17kw, why the different requirements, and could I get away using the rangemaster on a 32amp?

Thanks

 

[SaladFingers]

Have you got a model number we could look up?

 

[Iggifer]

Diversity can be applied to cooker circuits, for example:

First 10A + 30% of the remainder

10 + (63.9x0.3) = 29.17a

So the Belling & Stoves would be perfectly fine on a 32a breaker. You need to follow the Manufacturers Instructions though, so a Rangemaster would most likely need to be a 45a breaker.

I'm sure somebody has a more in depth answer than me though

 

[SaladFingers]

Diversity with cookers has always made me wonder, because I am a man who'll easily have the oven going, packed with Le Creuset stoneware and all hobs going at once, cooking the Sunday roast with my finest Stellar and Le Creuset tri ply stainless steel saucepans, whilst wearing an apron and only an apron.

So in my (just mine and perhaps many others) circumstances, there'd be no diversity as it's all running at once.

This is, of course if house staff are on holiday.

 

[Iggifer]

Diversity with cookers has always made me wonder, because I am a man who'll easily have the oven going, packed with Le Creuset stoneware and all hobs going at once, cooking the Sunday roast with my finest Stellar and Le Creuset tri ply stainless steel saucepans, whilst wearing an apron and only an apron.

So in my (just mine and perhaps many others) circumstances, there'd be no diversity as it's all running at once.

This is, of course if house staff are on holiday.

But once your oven(s)/hob(s) have reached temp it uses much less power to keep it hot so unless you turn them all on at the same time it's not really an issue

 

[SaladFingers]

Diversity with cookers has always made me wonder, because I am a man who'll easily have the oven going, packed with Le Creuset stoneware and all hobs going at once, cooking the Sunday roast with my finest Stellar and Le Creuset tri ply stainless steel saucepans, whilst wearing an apron and only an apron.

So in my (just mine and perhaps many others) circumstances, there'd be no diversity as it's all running at once.

This is, of course if house staff are on holiday.

But once your oven(s)/hob(s) have reached temp it uses much less power to keep it hot so unless you turn them all on at the same time it's not really an issue

Well, indeed, there is that, but with electric it's short bursts of their power to maintain and replenish heat, which could be at any time. It's unlike gas that can be on low all the time.

 

[DetlefSchmitz]

But the cable temperature rise is not instantaneous, so the heat sink of the cable tends to equalise these variations. This is why some low values of overload are defined to not trip the MCB for a large number of minutes.

 

[GarethW]

Isn't Diversity to do with the suppliers cutout fuse ?
So on Christmas day I can't turn on everything ?

 

[EFLImpudence]

Isn't Diversity to do with the suppliers cutout fuse ?

Not as far as cookers are concerned.

The term is also used for the maximum demand for the whole installation.

So on Christmas day I can't turn on everything ?

Not really sure what that means.
Have you a list of what not to turn on?

It is often claimed that allowed diversity on cookers will not be sufficient for Christmas dinner.
I don't think there is any evidence.
I will let you know on Wednesday how many call-outs for blown fuses there are tomorrow.

 

[GarethW]

Last week I installed a 10.6Kw cooker, new circuit back to the c/u
10mm cable on a 45a MCB
As I was finishing up the lady said to me "Just in time for Christmas dinner, I'll probabley have both ovens and the hob full !!"

 

[EFLImpudence]

But, as explained above, because the switch is 'on' does not mean the element is actually consuming power.
There are several elements all on and off and taking turns.

Something more apparent - your fridge is 'on' 168 hours a week; what proportion of this week is it actually 'working' (humming, rattling, whatever yours does)?

 

[Iggifer]

I'm gonna go for about 5% of the time for the compressor to be running, that might even be a little generous

 

[Lectrician]

And in high end properties these days, it is not uncommon to see a pair of dual ovens, and a pair of hobs!

 

[GarethW]

If I'm wrong then I accept it, but...
is the following correct or incorrect ??

COOKER CIRCUIT WITHOUT INERGRATED SOCKET ON ISOLATOR

Gareth

 

[EFLImpudence]

I haven't worked out every number but yes it's more or less correct.

I get the impression that you think if the table is correct then we are wrong.


Without diversity you would need 16mm² cable and 80A OPD which is the same as some HOUSES.

One thing that should be pointed out is that you must NOT use a cooker switch with an integral socket.