cookers and diiversity

[Mike Blair]

Just a bit confused with the cooker diversity. Now the cooker is 9800kw-10700kw 'the calculations below I have used 10700kw at 240v' the dB has a 32amp MCB and has about 13 meters of 6mm t&e to the outlet. I remember a thing from college says 10amps + 30% of the remainder current 22.3 amps? It is just an isolator there is no socket so theres no need for the +5amp but if the cookers on full load its going to come to 51.7 Amps o.o...its a double oven etc but I dout everything will be on at one time so this would need to be on a 10mm on a 40/45 amp MCB? Correct.

 

[telectrix]

Re: cookers and diiversoty

by using diversity as you have done, they gives you your design current Ib of 22.3A. now Ib<In<Iz, so 6mm on a 32A MCB id fine.

 

[Mike Blair]

Re: cookers and diiversoty

But wouldn't it trip all the time? In college we had like half a day on this subject and that was that

 

[telectrix]

Re: cookers and diiversoty

no, because the loads in the cooker will be switching in and out with the stats, also bear in mind that a 32A MCB will hold for about 1 hour @ 45A.

 

[Geoffsd]

Re: cookers and diiversoty

It will be fine on 32A MCB.

Your memory is correct but your maths is not.

10700 / 240 = 44.6A (9800 / 230 = 42.6A)

After diversity 20.4A. So a 32A supply gives over 50% tolerance.
In any case the cable can carry 47A (method C).

 

[Mike Blair]

Re: cookers and diiversoty

Ahh thank you very much. Sorry the the title I'm on my phone and it went full retard

 

[Mike Blair]

Re: cookers and diiversoty

I have an electrical calculator app must be a sack of balls haha thanks mate

 

[Knobhead]

Re: cookers and diiversoty

At 10.7MW you’re going need something a bit bigger than a 32A MCB. I don’t think anyone makes a 450,000A breaker.

 

[Mike Blair]

Re: cookers and diiversoty

At 10.7MW you’re going need something a bit bigger than a 32A MCB. I don’t think anyone makes a 450,000A breaker.

whaaaat

 

[telectrix]

Re: cookers and diiversoty

well spotted mr. grumpy. mike got his watts confused with kilowatts.

 

[Mike Blair]

Re: cookers and diiversoty

May of been my phone autocorrecting no clue why I would pit kW haha would of needed to be some oven to pull that hahaha

 

[D Skelton]

Re: cookers and diiversoty

I've never known any domestic cooker (ranges included) to ever need more than 6mm and 32A

 

[Pete999]

Re: cookers and diiversoty

whaaaat

Typo I expect

 

[HappyHippyDad]

Re: cookers and diiversoty

Ahh thank you very much. Sorry the the title I'm on my phone and it went full retard

I'm getting too old!

 

[Knobhead]

Got the supply for the oven sorted Mike.