My head hurts - cooker cable calc

[Octopus]

Ok, had far too much to drink last night and wish I'd done this estimate yesterday but didn't and need a sanity check.

New dual fuel cooker being installed (gas ovens) and electric hob

This is the electrical spec

Power ratings - hob 1 x 1kW, 2 x 1.7 kW, 1 x 3.0 kW, 1 x 3.5 kW, 2 x 1.1kW

Total hob rating @ 230v 13.25 kW

Maximum electrical load @ 230v 11.8 kW = 51A

So we all know it won't draw 51 amps and looking at the run I'd prefer to install a 6mm cable which would be good for approx 38A


Help!

 

[i=p/u]

10A plus 30% = abou y 22.1A

 

[Octopus]

2nd time round I came up with 28A but then my doubts crept in and you've come up with 22A

Where's the aspirin!

 

[telectrix]

6mm on a 32A MCB..... sorrted.

 

[Octopus]

6mm on a 32A MCB..... sorrted.

Thats what I originally thought but wanted to make sure!

 

[telectrix]

13,250/230 = 57.6A

10A + ( 0.3 x 47.6) = 24.28A.

 

[Octopus]

13,250/230 = 57.6A

10A + ( 0.3 x 47.6) = 24.28A.

Thanks. Interestingly if you add up the individual loads as listed its slightly less.

Ta chaps. Estimate will be sent after the next strong coffee !

 

[i=p/u]

and as you asked engineer and accepted answer 11.99 this way

 

[Engineer54]

Thanks. Interestingly if you add up the individual loads as listed its slightly less.

Ta chaps. Estimate will be sent after the next strong coffee !

Possibly the total KW rating includes the oven fan and oven light and controls...

 

[i=p/u]

Never assume as are AN electrician and you dont know characteristics or distance of cooker run

6mm on a 32a mcb..... Sorrted.

- - - Updated - - -

WHAT GOOD IS POSSIBLY ????

Possibly the total KW rating includes the oven fan and oven light and controls...

 

[Engineer54]

Never assume as are AN electrician and you dont know characteristics or distance of cooker run




- - WHAT GOOD IS POSSIBLY ????

So you tell me what difference will it make then, the quoted KW remains the Same??


6mm on a 32A MCB is good for cooker loads up to 15KW. You would have to go some, for distance and cable factors, to change this typical circuit compliance!! Literary Millions of homes in the UK will have exactly the same circuit make-up.

 

[i=p/u]

anything more than 50m and installation methods could stop it from complying , now we didnt have enough info to:81: just say 32A 6mm spot on

 

[i=p/u]

and foget about half the country, and concentrate on this ...

 

[MDJ]

I came up with 23.22 amps, however I have have a few sunday beers haha, a 6mm2 will be fine IMO.

 

[Octopus]

The run is about 10 meters. My head did hurt at the time. The aspirin and coffee have worked.