cable size for cooker

country boy · Posted: Mon Oct 08, 2007 8:27 pm Post Subject: cable size for cooker

We are moving to an all electric flat our new (Belling)cooker is rated at 9400 watts.
what size cable will this need?

securespark · Posted: Mon Oct 08, 2007 8:55 pm Post Subject:

Depends.

Whether you want to design the circuit to take flc or use diversity. Upon the cable length, route and other environmental factors.

__________________
As George Michael once said, "..if you're gonna do it, do it right, right?"

country boy · Posted: Mon Oct 08, 2007 9:03 pm Post Subject: Re: cable size for cooker

country boy wrote:

We are moving to an all electric flat our new (Belling)cooker is rated at 9400 watts.
what size cable will this need?

I should have said the cable in question is the one from the back of the cooker to the outlet in the wall.

loosenup · Posted: Mon Oct 08, 2007 9:55 pm Post Subject:

Without seeing the circuit I would say that you need to have the circuit checked by a sparks .. only then can safe advise be given . there are so many factors to take into consideration when connecting a high power cooker to an existing circuit.. even to calculate diversity .
If you connect it with too small a cable then you will overload the cable to the fuseboard .. with a result of the very least the mcb tripping when you turn the main oven on. if you do not have an mcb in the CU then the results could be far worse .
Get a sparks in .
Safety first .
Phill

securespark · Posted: Mon Oct 08, 2007 10:21 pm Post Subject:

loosenup wrote:

If you connect it with too small a cable then you will overload the cable to the fuseboard .. with a result of the very least the mcb tripping

Overloading the cable does not necessarily mean the CPD will operate...

__________________
As George Michael once said, "..if you're gonna do it, do it right, right?"

loosenup · Posted: Tue Oct 09, 2007 3:26 pm Post Subject:

SparkyMike · Posted: Thu Nov 08, 2007 12:19 pm Post Subject: cooker circuit

The rule of thumb for cooker circuits is:

32A MCB or 30A fuse
6mm flat Twin+Earth cable

Applying diversity:

9400w

9400/230 = 41Amps maximum

Formula: 10A + 30% of rest + 5A for any socket outlet

10 + 0.3 * 31 + 5 = 24.3A

We only need to cater for 24.3Amps or only 19.3Amps if no socket outlet.

If its a short run from the cooker to the consumer unit then you could get away with 4mm cable.
I would use 6mm cable just incase you get a bigger cooker in the future or the cable run is long.

Also if the cooker switch has a build in 13A socket and the flat is on the ground floor then ideally it should be protected by a 30mA RCD as well.
some old cookers will nuisence trip some RCDs due to there higher leakage currents. This is normal and nothing to worry about.

plugwash · Posted: Thu Nov 08, 2007 12:22 pm Post Subject: Re: cable size for cooker

country boy wrote:

We are moving to an all electric flat our new (Belling)cooker is rated at 9400 watts.
what size cable will this need?

I should have said the cable in question is the one from the back of the cooker to the outlet in the wall.

Before we give advice we need to know the following

1: what is the rating of the fuse/mcb protecting the circuit
2: what is the size of the existing cable in the circuit.