Cooker supply 12kw correct cable size

[Adamk]

Hey guys

I’ve run a 6mm for a cooker, runs about 10metres. The customers has changed her mind on the cooker and gone for a 12kw range. Went back today to finish off and saw this lovely surprise. I know you have to take diversity into account. But for my peace of mind. Would 6mm 32a MCB be fine?

Kind of panicking a bit as the jobs finished.

What you think? Please dont tell me to tell her to change it as that’s not really an option Thanks

 

[telectrix]

nothing wrong with 6mm on a 32A unless the cable is covered in >100mm of insulation.

 

[Spoon]

Will this help.
My head hurts - cooker cable calc - https://www.electriciansforums.co.uk/threads/my-head-hurts-cooker-cable-calc.69105/

 

[Adamk]

Well the things is that it’s inside a 25mm conduit under some screed for about 5metres... rest of it’s under the floors boards so got
Plenty of air. Thoughts?

 

[123]

Any Under Floor Heating?

 

[Adamk]

Any Under Floor Heating?

Nope, not at all. Run back the board is near no pipes or rads

 

[telectrix]

Any Under Floor Heating?[/QUOTE

there willl be if his cable calcs. are wrong.

 

[Adamk]

Have to charge her extra for the heated screed

 

[ashrow]

I installed one the other day, the instruction stated 32amp supply and 6mm twin and earth

 

[Octopus]

Top tip from me - get your client to define PRECISELY which model that they want to buy before 1st fix and explain why you need this ......... then they think twice about changing their minds...

 

[Adamk]

Top tip from me - get your client to define PRECISELY which model that they want to buy before 1st fix and explain why you need this ......... then they think twice about changing their minds...

Yes this is the 1st time this has happened after many many kitchen jobs. Howdens muck up the kitchen layout and they had more space where the cooker was going to go, so they
Thought they would go for a wider and more powerful as they had more space....
Not ideal

 

[mattg4321]

Never come across a domestic cooker yet that needs a bigger supply than 32A.

Always use diversity. Fitted cookers up to 14kw total load and never had a problem yet.

 

[Taylortwocities]

After diversity the estimated demand is till only 22ampsish. It'll be fine on 6mm/32A. Dont go there for Xmas lunch, just in case

 

[Octopus]

Our 17.7 kw Rangemaster is on 10mm but the OEM said 6mm would be good enough1

 

[123]

What you have should be more than fine, On Site Guide suggests a 15kW Cooker is fine on a 32A MCB and 6mm Cable.

When customers change their mind it can be a PITA, had it before where it was a gas hob all the way so just a simple spur off the ring, got there to finish the job and no gas hob there, a blooming ceramic touch control electric one instead

 

[Ian1981]

Our 17.7 kw Rangemaster is on 10mm but the OEM said 6mm would be good enough1

What cable type and size did you connect from the cooker outlet to rangemaster?
17.7kw sounds like a beast!

 

[Adamk]

What cable type and size did you connect from the cooker outlet to rangemaster?
17.7kw sounds like a beast!

Must be 10mm on a 40a mcb... with the cooker switch rated at 45amps... my personal choice

 

[Ian1981]

Must be 10mm on a 40a mcb... with the cooker switch rated at 45amps... my personal choice

I meant from the outlet to the actual cooker, rather than from the OCPD to the isolator/outlet
I can’t recall seeing a domestic cooker/oven being able to take 10mm in its terminals

 

[Octopus]

What cable type and size did you connect from the cooker outlet to rangemaster?
17.7kw sounds like a beast!

This one:

Toledo 90cm Range Cooker - Induction Hobs | Rangemqaster - http://www.rangemaster.co.uk/products/range-cookers/toledo/toledo-90-induction

Ignore the bit about gas ........... its all electric!

My connecting cable is 10mm T&E!

 

[Ian1981]

This one:

Toledo 90cm Range Cooker - Induction Hobs | Rangemqaster - http://www.rangemaster.co.uk/products/range-cookers/toledo/toledo-90-induction

Ignore the bit about gas ........... its all electric!

My connecting cable is 10mm T&E!

All that just to heat up a tin of baked beans