Beast of a cooker

[brizospark]

OK I know this has already been covered but I have been asked to install a supply and isolation switch to a Rangemaster cooker which has a rating of 14kw.

This cooker has a couple of ovens and grills and induction hobs - it's a beast

My question is regarding the cable / isolation switch rating, I know there is some debate over the issue but I reckon being realistic there is no chance that the cooker will ever run at full capacity and that a 6mm cable covered by a 40a MCB (only 5m run from board no insulation under floor) and a 45a DB switch would suffice.

The other option would be a 63a MCB with 10mm cable and a 63a rotary isolator.

The house is occupied by a couple and soon to be baby.

What would you guys do in this situation?

 

[telectrix]

6mm on a 40A MCB. no problem.

 

[SPARTYKUS]

What does the manufacturers instructions stipulate :smiley2:

 

[Bsharp]

Once allowing for diversity I would think a 10mm and 50amp D.P. Isolator would be fine.

 

[daviesjoe]

Using diversity.

14000/230 = 60.9A
30%= 18.3A + 10A = 28.3A

If there is a socket on the cooker isolator + 5A.

... If im correct

 

[SPARTYKUS]

Check if its got the PIZZA function (grill & oven on at same time)

 

[Geoffsd]

14000/230 = 60.9A

30%= 18.3A + 10A = 28.3A

If there is a socket on the cooker isolator + 5A.

... If im correct

Not quite.

14000/240 = 58.33

58.33 - 10 = 48.33

30% of 48.33 = 14.5 + 10 = 24.5A

+ 5A if socket.

 

[Hawk]

I know that diversity is applied for a cooker circuit, but what happens at Christmas for example, when she is running full tilt?

 

[brizospark]

so the general consensus is that 6mm with a 32a MCB is the way to go?

 

[wozz]

I know that diversity is applied for a cooker circuit, but what happens at Christmas for example, when she is running full tilt?

Do you ever think that all parts of the cooker will be drawing current simultaneously? considering thermostat control. And even if they did how long would it be for?

I have put these on 40A supplies no problem in the past.

 

[Badged01]

What does the manuf recommend in their instructions?

You can use whatever C/B & wiring combination you want as long as the C/B covers the wiring --- at worst the C/B will just keep tripping on overload or the wiring will melt down if on slight overload conditions on a 24hr hog roast!!

 

[Octopus]

The Rangemaster instructions with the cooker do not specify a cable/breaker size, however, when your shiny new expensive cooker goes wrong and can't be fixed in the "field", and Range Master are confirming delivery of the replacement unit, the paperwork they send, stipulates a minimum 6mm cable with a 32A MCB - I know this because it happened to us in January!

 

[Badged01]

Not so posh in our house, just the wood burning version .... we cant afford the electricity bill!

 

[Meggerman]

6mm & 32A is good for upto 15KW cooking load. And it really is too, I have connected loads of rangemasters and never had a problem.

 

[Hawk]

Who knows wozz, depends what the manufacturer says.