cable calcs for cooker

[still learning.]

hi, I'm trying to work out which cable size to use for a cooker but I'm not sure what the ambiant temp will be for the correction factor can any one help please?

 

[telectrix]

generally use 20deg.C for ambient temp.

 

[SKY]

hi, I'm trying to work out which cable size to use for a cooker but I'm not sure what the ambiant temp will be for the correction factor can any one help please?

Are you also applying diversity?

 

[still learning.]

yes do i work out the diversity first then apply the correction factor?

 

[SPARTYKUS]

Still learning - are you asking about temperature because you're thinking about the cable that goes from the wall to the cooker?

 

[still learning.]

...yes

 

[telectrix]

i would work out the diversity first. if , say, the current demand was 32A ( after diversity ) and you decided to use 6mm cable clipped direct, that is rated at 47A, so i would not even bother with correction factor, as the 6mm is well over demand. ( unless this is an exercise for college, then you need to calculate it ).

 

[still learning.]

ok thanks everyone

 

[SPARTYKUS]

Cookers are often a suprise, after the initial shock of reading the "28.7Kw total load" on the back, when you work it out by the book it comes out not needing much at all.

 

[still learning.]

hi, sorry to bother you again but can I run my calcs by you to check if I done it right.
cooker is 10.6kw

10600/230 = 46A

10 A
+ 30% (10.8A)
+ 5A

= 25.8A
which is 2.5mm clipped direct as it has a rating of 27A

 

[SPARTYKUS]

Glennspark

very good, I was thinking more of table 1B in the OSG for diversity!

 

[Engineer54]

Your forgetting the protective devise your intending to use. In any case, It's good practice to keep domestic cooker type circuits on a minimum 6mm cable....

 

[still learning.]

yeah thats what it say's in the OSG table 1B
no3 cooking appliances

 

[still learning.]

So even though my calcs say 2.5 you recomend I use 6mm.

 

[telectrix]

25.8A is pushing 2.5mm. definitely go for 4mm, or as engineer has said , 6mm. you never know if a larger cooker may be fitted in the future. so 4mm or 6mm on a 32A MCB.