12kw electric ccoker

[robbie77]

Hello,

I keep changing my mind on getting a new cooker cable installed for my new cooker. Its fully electric range type and 11.9kw. The old cooker is a lot smaller.

The cable at the moment is 6mm, is is routed through joists and conduit from the CU then clipped to the wall in the kitchen to the cooker (radial).
The distance is abut 12 metres in total.

The kitchen is due to be re plastered and I keep reading conflicting advice on wether to upgrade.

My gut feeling is to go for 10mm to be on the safe side but Its obviously going to be hassle in the kitchen with part p and all and at the end of the day I want it to be right.

Shall I look into getting it changed?? Opinions?

Thanks

 

[ban-all-sheds]

Change it.

 

[robbie77]

OK.
That's all I needed to hear.
Ta.

 

[chapeau]

..... I keep reading conflicting advice on wether to upgrade.........

Morning Robbie. No need to take advice, you can work it out for yourself.

All you need to know about the theory is in the On Site Guide, key points summarised in this thread, put your own figures in and you have answered your own question.

http://www.diynot.com/forums/viewtopic.php?t=214080

 

[PrenticeBoyofDerry]

The cooker on full load will take 52 amps.
using worse case ref method B,
6mm cable will carry 34amps and 10mm 52amps.
applying diversity to the circuit, could mean you would get away with, a current of 23 amps or 28amps if a socket outlet was connected to cooker control switch.
But I'd consider changing it.

 

[robbie77]

The cooker switch does not have a socket attached (is this ref B?).
So the calculations should be ok.
I will try and work it out for myself. The cable is much bigger and will probably need a bit more work to run so if I can avoid it I will.

Thanks guys

 

[PrenticeBoyofDerry]

no ref method B is how the cable is routed, as you stated some in conduit, so that is worse case scenario.
If a socket outlet is on the cooker switch/isolator, 5 amps needs to be added to the the applied diversity, regardless of the way the cable is routed.

 

[robbie77]

no ref method B is how the cable is routed, as you stated some in conduit, so that is worse case scenario.
If a socket outlet is on the cooker switch/isolator, 5 amps needs to be added to the the applied diversity, regardless of the way the cable is routed.

OK. Cheers.
According to your calculations and the ones I attained myself (thanks to chapeau link) the cable without the socket should be ok. I would be happy with that but you said maybe I should consider changing it! Is that "be on the safe side philosophy"?

 

[PrenticeBoyofDerry]

No, it's because you are considering installing a 12kw appliance, it may never go on full load but if it does the demands are higher.
You are in a position now, that you can upgrade the cable and protective device, so the appliance can take full load, so why not do it!

 

[chapeau]

because

Its obviously going to be hassle in the kitchen with part p and all and at the end of the day I want it to be right.

 

[ban-all-sheds]

I want it to be right.

Robbie - are you looking for advice on whether, as part of a kitchen refurbishment involving an expensive new cooker and plastering and decorating, you should improve the cooker circuit, or are you looking for people to agree with your desire to leave it alone?

Is there no other electrical work being done in the kitchen?

 

[chapeau]

Yes but you are not the person to listen to as you are getting it wrong

Again.

6mm is "right".

The OSG says it is "right"

You are not "right"

Again

Stop giving bad advice that cost people money they don't need to spend

 

[ban-all-sheds]

Interesting that you should only be criticising me for advising replacing the cable - one might think that you were engaged in a pathetic and childish ongoing dispute in which your sole aim was to disagree with me whenever possible, no matter how irrational that was.

Please show me where any regulation makes the application of diversity mandatory.

 

[EdwardCurrent]

Hello.
(Regardless of the OSG's 'minimum standards').

It appears that the current cable is 'ok' to use for your appliance, using diversity, however, I would take the opportunity to 'run' another cable 10mm.
You have mentioned that the existing cable is 'clipped to the wall' in the kitchen, wouldn't you prefer a 'neater' job, and peace of mind X-mas morning when the cooker is flat out ?

Regards
Ed

 

[robbie77]

Well I downloaded the pdf specification for the cooker (would have made sense to do this first!) and it states rightly or wrongly as it does not give many variables on the cable environment......

"the product must be installed.....to a suitable double pole control unit with a minimum contact clearance of 3mm in all poles and with a minimum rating of 32A....recommended cross-section area is six square millimiteres (6.00m2). the mains cable must conform to BS6004"

It does state that the mains cable must be routed away from the appliance and in particular ventilation slots.

I appreciate the input.