cooker connection

[flukey]

hi all,
i have got an oven and hob to connect to an existing supply.
the oven is 5.7kw and the hob is 6.8kw.
just been having a read up and it says that 2 items can be connected to a single cooker circuit as long as they are under 15kw
am i reading this right

 

[electricAl]

Not sure if you`re reading the same text as me, Flukey, but i read 50A for both!

That`d give you a theoretical max overhead of 12 KW - assuming the ratings you supplied relate to current draw @ 240v. As in, 6.8 + 5.7 / 240v = 12. Even if its @230 it`ll be max 54.3A pull.

Although you can`t be as generous as if they were Cookers proper, collectively you could still apply some demand & diversity. The hob will have integral thermo control preventing all `rings` remaining on at once. Even the hob will cycle. So i`d have no problem convincing myself as designer that the Ib could reasonably be assumed <50A

 

[Frenchsparky]

hi all,
i have got an oven and hob to connect to an existing supply.
the oven is 5.7kw and the hob is 6.8kw.
just been having a read up and it says that 2 items can be connected to a single cooker circuit as long as they are under 15kw
am i reading this right

I just want to make sure I don't step in wrong spot here due I am new in here on this fourm.,

However If your regulations do allow it and the conductors or cable is exsting and large engough to handle the load { 16mm²} { I do not know if they still required a RCD or not unless stated with your local requirement }

In USA it is legal with exsting installment but once you move to new location then there are few other codes { regulations } will come up. for new installement normally it will be seperated circuits for both hob and wall mounted oven.

In France it legal but one gotcha you need to add a local disconnetion switch as well { it almost the same with USA side }

Merci.
Marc

 

[flukey]

Not sure if you`re reading the same text as me, Flukey, but i read 50A for both!

That`d give you a theoretical max overhead of 12 KW - assuming the ratings you supplied relate to current draw @ 240v. As in, 6.8 + 5.7 / 240v = 12. Even if its @230 it`ll be max 54.3A pull.

Although you can`t be as generous as if they were Cookers proper, collectively you could still apply some demand & diversity. The hob will have integral thermo control preventing all `rings` remaining on at once. Even the hob will cycle. So i`d have no problem convincing myself as designer that the Ib could reasonably be assumed <50A

hi al,
thanks for the reply.
it does state max 50A for both, but above that it says "A 30 or 32A circuit is usually appropriate for household or similar cookers of rating up to 15kW
ive attached the page for you

 

[Frenchsparky]

Flukey.,

Thanks for the attachment to the reguations reguarding of the cooker units.

But please do correct me if I am wrong on this part but it do have " demand factor " if you have multi cooking units like both countertop hob { burners } and wall ovens that have diffrent figures for that ?

I know in USA side we do have demand factor it kinda compiated figures simair way with France but they are restricted to 32 or 40 amp max nothing more above that unless a commercal location.

Merci,Marc

 

[electricAl]

hi al,
thanks for the reply.
it does state max 50A for both, but above that it says "A 30 or 32A circuit is usually appropriate for household or similar cookers of rating up to 15kW
ive attached the page for you

The key word to that particular section is "cookers" which are one of a very few select categories that can have allowance made to their final ccts.
Demand & diversity is ordinarily not permitted to finals - only the mains & sub-mains supplying them.
They give recognition to this fact in the above section ^^^
Its a rare case indeed when we told we can attach a mid 50A load to a 30A protective device!
They`re telling us that a true "cooker" (combined oven/hob/grill) has an Ib significantly below its summed totals, & won`t be capable of supplying its rated max current for sustained periods - so its permitted to make allowance for this in the cct supplying it. This applies to the cable as well as the protective device.

You`ll note the choice of wording changes in the subsequent section - where they refer to "cooking appliances" upto 50A. With these, much more thought is required before applying any demand & diversity. As in your case, a seperate hob & oven will work independantly from one another, & each should have their Ib`s assessed quite seperately. As i denoted, such an assessment would lead you to fairly assume certain thermostatic cycling for each of the devices & a modest derating of max current draw.

The two sections could have been written to make these factors more clearly understood - but the guts of the section is as i`ve described.

Hope that makes it clearer Flukey

 

[flukey]

cheers al,
so by applying diversity to both appliances means i can quite happliy connect both to the 10mm 40/50 amp feed.

 

[Mac]

Cooker circuits rated between 16A and 50A may supply two or more cooking appliances installed in the same room. The cooker switch should be installed within 2m adjacent to the appliance(s). One cooker switch can be used to control more than one appliance.OSG Page 160

 

[flukey]

Cooker circuits rated between 16A and 50A may supply two or more cooking appliances installed in the same room. The cooker switch should be installed within 2m adjacent to the appliance(s). One cooker switch can be used to control more than one appliance.OSG Page 160

hi mac,
weve already established that was looking for clarity on my situation a 5.7kW oven and a 6.8kW hob if you have an opinion on the previous posts it would be much appreciated

 

[Mac]

I've always put any circuit over 2kw on a dedicated circuit,that is just me.I found this and it seems you can put more than 1 appliance on a cooker circuit.Can't wait till Xmas day when the whole lot is going full pelt.
electric cooker circuits
You didn't state what size the actual cable was,as quoted by electricAl in another post.16mm for 15kw cooker

 

[flukey]

I've always put any circuit over 2kw on a dedicated circuit,that is just me.I found this and it seems you can put more than 1 appliance on a cooker circuit.Can't wait till Xmas day when the whole lot is going full pelt.
electric cooker circuits
You didn't state what size the actual cable was,as quoted by electricAl in another post.16mm for 15kw cooker

hi mac
it does state the cable size as 10mm
yet to find a cooker circuit in a domestic situation run in 16mm

 

[Spudnik]

hi mac
it does state the cable size as 10mm
yet to find a cooker circuit in a domestic situation run in 16mm

Did one about a year ago.

12KW cooker about 20 meters.

Now THAT was fun.

 

[Frenchsparky]

Did one about a year ago.

12KW cooker about 20 meters.

Now THAT was fun.

Maybe this will get over on you .,,


Try to cut the cement floor up to bury the conduit for full 35 meter FK that cut 200mm thick cement with oddball rebars which I try to advoid and no this is not a spancrete. { all this done when the owner is still living in that place it is fun to keep the dammed dust out }

Once I put it in the new conduit then string in new conductors in but that cooker is full 14 KW I know 16mm² may bearly squeak by but I install 25mm² conductors that useally slove the issue with the distance


Merci,Marc
Merci,Marc

 

[flukey]

Did one about a year ago.

12KW cooker about 20 meters.

Now THAT was fun.

hi jason
so you reckon i would be best running a separate 6mm circuit for the hob then and leaving the cooker on existing circuit

 

[electricAl]

hi jason
so you reckon i would be best running a separate 6mm circuit for the hob then and leaving the cooker on existing circuit

Since when did your hob turn into a cooker?

Flukey, don`t get all paranoid on me now.

You can`t go back to the Darkside now! With those that have not yet seen the light - stand with me & we`ll convert em

"What you say? 16mm for a cooker! Ahh, we have to route it through a foundry. Quite right. Will be 16mm then"

Flukey, 10mm sounds fine. Unless you are routing through a foundry that is