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

 

[Spudnik]

Since when did your hob turn into a cooker?

Since the thread started


No mate, 10mm will be fine.

Mine was specced on a job.

I tried to argue the ---- about it but it fell on deaf ears.

 

[flukey]

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

hi al,
good post meant to say oven not cooker .
just for clarity, separate oven(5.7kW) and hob(6.8kW) on an existing 10mm cooker circuit
thanks for all the replies, they are much appreciated especially you al

 

[electricAl]

meant to say oven not cooker .

Phew! had me worried for a minute

If it`d been a cooker you`d have needed 16mm




"...since the thread started"

still chucklin at that



even if he is a ship-jumper

 

[flukey]

looking at the connection point on the hob today and it says use 2.5mm cable seems strange for a 6.8kW hob or am i missing something

 

[electricAl]

Don`t get going paranoid again

Kinda proves the point re: assessing demand & diversity really.

But where we were estimating the actual load wouldn`t reach the supplied max rating, being the manufacturer they know it can`t by its design, and have thus suggested using a lower ccc supply cable.

Must admit tho, 2.5mm seems a bit optimistic. Were they specific about type of cable? 6.8w / 240v would allow 28.3 A tops, so assuming thermostatic control, real-world current draw = less than that most likely.
Ultimately its up to you fella, & Manufacturers Instructions are usually Bible, but if you`re uncomfortable with 2.5mm theres nothing wrong with going bigger.

16mm it is then

 

[pennywise]

The manufacturers usually supply H07RN-F flex or HO5 flex 2.5mm multicore which is fine for a max of 20amps so obviously they allowed slightly more on the diversity and the fact that the maximum length of flex should only be 2m to the isolator or cooker outlet point.

 

[flukey]

Don`t get going paranoid again

Kinda proves the point re: assessing demand & diversity really.

But where we were estimating the actual load wouldn`t reach the supplied max rating, being the manufacturer they know it can`t by its design, and have thus suggested using a lower ccc supply cable.

Must admit tho, 2.5mm seems a bit optimistic. Were they specific about type of cable? 6.8w / 240v would allow 28.3 A tops, so assuming thermostatic control, real-world current draw = less than that most likely.
Ultimately its up to you fella, & Manufacturers Instructions are usually Bible, but if you`re uncomfortable with 2.5mm theres nothing wrong with going bigger.

16mm it is then

hi al,
not getting paranoid mate just cant see how this would be right
i wont be putting it on 2.5 for my own peace of mind

 

[pennywise]

Because when you alow for diversity on the hob unit it gives you a figure of 22.8 amps or 23.6 if your using 230v for your calcs, the manufacturer has given the minimum size of the supply cable as 2.5mm because probably it's only taking into account the possibility of the cable being clipped to the wall direct and so giving it a maximum current carrying capacity of 27amps they don't take into consideration the installation method because that is our job to identify the factors that should be applied hence you would probably wire the hob in a minimum of 6mm (sorry)which would take into consideration it being buried in the wall,in insulation or volt drop etc. Sure someone will correct me or have a different view thanks.

 

[flukey]

Because when you alow for diversity on the hob unit it gives you a figure of 22.8 amps or 23.6 if your using 230v for your calcs, the manufacturer has given the minimum size of the supply cable as 2.5mm because probably it's only taking into account the possibility of the cable being clipped to the wall direct and so giving it a maximum current carrying capacity of 27amps they don't take into consideration the installation method because that is our job to identify the factors that should be applied hence you would probably wire the hob in a minimum of 4mm which would take into consideration it being buried in the wall,in insulation or volt drop etc. Sure someone will correct me or have a different view thanks.

hi pennywise,
if that were the case, then surely the circuit would need derating to 20amp mcb

 

[pennywise]

Can the hob be wired in a three phase configuration? and what manufacturer and model number is it?

 

[flukey]

vitralux vlc-60tcfl

 

[pennywise]

Ok That has to be the worst website ever for an installer. I still think they are referring to HO7 flex when they say it can be wired in 2.5mm and thats just to the isolator or cooker outlet plate.

 

[flukey]

not very good is it the instruction are at the connection point and refer to 230 volt connection

 

[pennywise]

Ok will retract earlier post would say they are definitely referring to the connection between the hob and the cooker outlet plate with HO7 flex, ring them to confirm it tomorrow.

 

[flukey]

emailed them yesterday no reply yet think il connect as per usual if they dont reply by time it needs doing