Range Cooker Cabling

[ArgyllMC]

I am in the process of ripping out the kitchen and as part of the re-working a new Stoves Electric Induction Range cooker is being fitted. I have a sparky (currently on holiday until 17th) coming in to do the wiring when we get to that stage however when re-lining the walls etc I was going run in the cabling ready for him to connect at either end.

In his absence and to avoid delay I just wanted to double check cable spec, he said 10mm would be fine with the current 40amp breaker but it looks to small having looked at the specs a bit closer. Cooker consumption breaks down as:

Hob - Total if all in use 14.7kw (5 plates in total)
Cavity 1 - 2.7kw grill
Cavity 2 - 40kw oven
Cavity 3 - 40kw oven

I was assuming you had to work on the full loading and this seems to be a lot of draw for a 10mm cable and 40amp breaker however, the spec sheet we initially looked at specified a fuse size of 32A (as does that supplied with the cooker).

Hopefully I have got my knickers in a knot over nothing however any advice would be greatly appreciated.

 

[Taylortwocities]

Hopefully I have got my knickers in a knot over nothing .

You certainly have!

40KW is 173amps @230volts!
Maybe it says 40KWh??

All of that is academic. Each of the items may have sizeable power requirements, but supply sizing is done using a technique called diversity. This judges that there will never be a time when everything is on 100% .
Need to know the make and model of the Stoves cooker. Better, what do the installation instructions say about the supply requirements?

 

[EFLImpudence]

Cavity 1 - 2.7kw grill
Cavity 2 - 40kw oven
Cavity 3 - 40kw oven

Unlikely.

 

[JohnD]

Even 4kW would be a lot for an oven, they are usually 2kW-3kW depending on size. It is possible though if it has top/bottom/fan heating and you can put several elements on at a time. I have an multi function oven that can do combination cooking with grill and fan together.

Are you sure it doesn't say 4.0?

 

[EFLImpudence]

he said 10mm would be fine with the current 40amp breaker but it looks to small having looked at the specs a bit closer.

10mm² would, indeed, be fine (so would 25mm²) but it is also unlikely that it would be required.

 

[ArgyllMC]

Thanks very much for all your prompt input.
Full details of the range can be found here
http://www.stoves.co.uk/products/cooking/range-cookers/richmond-900ei/444441648/factsheet/

I am guessing it might be a typo on the sheet and as suggested its actually meant to say 4.0kW rather than 40!

 

[davelx]

Wow! 40kW Oven Lights! They don't even mean 4kW. Probably 40W.

It's all there in the specs:

The load of the hob is shown near the top:

• x1 Large Burner (2.3kW – 3.7kW)
• x2 Medium Burners (1.6kW – 3.0kW), x1 Medium Burner (1.4kW – 3.0kW)
• x1 Small Burner (1.15kW – 2.0kW)

The oven loadings are shown for each cavity:

Cavity 1 ) Power (kW) Oven (1.3kW) grill (2.7kW)
Cavity 2) Power (kW) 2
Cavity 3) Power (kW) 2.5

The load for the oven lights is also given for each cavity and that is where the typ[os are.

 

[stillp]

typ[os

Ironic!

 

[davelx]

typ[os

Ironic!

deliberately left in

 

[stillp]

typ[os

Ironic!

deliberately left in

I thought so.

 

[ArgyllMC]

Thanks very much for pointing out the obvious!
I will continue with the 10mm cable as per our original discussion and look forward to lighting the local football pitch with the 40kW lighting!

 

[winston1]

Even 10mm is over the top. 6mm cable is adequate.

 

[Taylortwocities]

Note the link you provided says
Power supply 230V
Fuse size (A) 32
So 6mm would be adequate.I would put in 10mm, then you'll be future-proof for almost anything.

 

[ArgyllMC]

Note the link you provided says
Power supply 230V
Fuse size (A) 32
So 6mm would be adequate.I would put in 10mm, then you'll be future-proof for almost anything.

Thanks I have a length of 10mm left from fitting a power shower a few years ago so I figured us that and then as you say who knows what the future will hold but I should be able to power it!

 

[EFLImpudence]

Yes, you may want to change your range for a flat.