Cooker circuit calc

[Baker1988]

Hi all im only at college training but i have just been reading a post about a cooker cable i was just wondering about this post here goes if you was putting in a new cooker circuit for a cooker (say 10kw) would u not add it up and to 43 amps and use a 40 amp breaker because it said u take 10 amps and 30 percent of the remainder that doesnt seem right to me if it can pull 43 amps why would u put it down to say 20 amps ( give or take) wouldnt it always trip? And if you was gonna put a 20 amp mcb could u use 2.5 or 4mm cable instead of 6 mm or 10mm?

 

[Richard Burns]

If you have a cooker with an oven, a second oven and four rings on the hob then if you switched on all of these simultaneously then the current (may) reach 43A. However you would not normally have everything running simultaneously and also once the particular element reaches the set temperature it will switch off for a while through the thermostat and so would not be drawing power. Also a circuit breaker can take 1.5 times it rated current for one hour with out tripping and you will have cooked the meal by then and switched off.
That's diversity!

 

[Guitarist]

Christmas day test equates to full load current for several hours, hence big breaker plus big cable :yes:

 

[Engineer54]

Christmas day test equates to full load current for several hours, hence big breaker plus big cable :yes:

So what are you saying here, all those millions of cookers in the UK that are running on 6mm cable and a 30A/32A Breaker/Fuse are all going to trip out on Xmas day?? In all my years in the industry, i've personally never seen or heard of it ever happening.

 

[Guitarist]

So what are you saying here, all those millions of cookers in the UK that are running on 6mm cable and a 30A/32A Breaker/Fuse are all going to trip out on Xmas day?? In all my years in the industry, i've personally never seen or heard of it ever happening.

Not at all. I was refering to the earlier post asking if you could derate to 20A with 4mm or 2.5mm due to diversity. I think 6mm and 32A is perfectly adequate for most applications actually. I know you like to jump on people, but didn't think you would misinterpret that one.

 

[Engineer54]

Not at all. I was referring to the earlier post asking if you could derate to 20A with 4mm or 2.5mm due to diversity. I think 6mm and 32A is perfectly adequate for most applications actually. I know you like to jump on people, but didn't think you would misinterpret that one.

If you don't include a quote bubble, how is anyone going to know what your post is referring too??
My post replied to what you had written, pure and simple!! lol!!

 

[Guitarist]

I have a great deal of respect for your knowledge and experience Engineer 54. I was simply surprised that you picked up on my very tongue-in-cheek reply regarding what I thought was obviously about the 20A supply and quoted me with some derision. I apologise if I didn't make it clear with a bubble.