Cooker cable

[Electromob]

Hi all, just joined, starting my Nvq soon. Was wondering if I'm correct in assuming the cooker can be on a 6mm conductor on a 30amp RCD and the hood can be on 1.5mm if it's a spur?

 

[i=p/u]

take easy on yourself, not sure as i left all my books on train and they goneeeeeeeeeeeeeeeeeeeeeeeee.. put il take your word for it. can you tell me if im wrong.. i was told last week you can come off busbar in any cable as long as fused within 3m , that lets us get away without using bigger cables if no ie room

 

[malcolmsanford]

You can as you say reduce the size of the cable CSA in many situations as long as you adhere to regulation as above. Part of that reg is the 3 metre distance you quoted, but another part the (i) (ii) is just as important, coming of a 300amp bus bar with a bit of 1,5mm will IMO be a fire risk in the advent of a fault I would not want to do it, perhaps others might.

 

[cagedanimal2010]

well baring all this in mind i may just wire everything in 1mm now

 

[SimpleSimon]

As Malcolm has stated alot of the older less efficient cookers you shouldn't really take a spur off for a hood because it's so close to the maximum cable capacity load.
However we are starting to see some gas/elecrtric combined cookers that don't draw as much current and possibly than you could take a cooker hood supply off it.
But that you would have to find out for yourself, find out the power outage of the appliance, use the formula to convert to Amps and compare the total load with the maximum cable current carrying capacity dependent on the installation method. Simple when you know how

 

[i=p/u]

so you saying it can be done malcom???? and faults sould be eliminated before heat gets high enough.... maybe im wrong but op and yes id probably use socket outlet aswell. im learning to be confident here in what i say lol thanks

 

[i=p/u]

i know its simple, cause i go to tech, never take day odfff

 

[SimpleSimon]

Think Malcolm wouldn't mind me saying that what's he's saying I=p/u is that it could be done given the relevant info and correct calculations but given that the question was asked by someone learning it's more benifical to them to understand basic concepts before we start on circuit capacity and designing circuits. As Malcolm said, you have to walk before you can run.

 

[SMB]

well you'l learn

Mmmm.....hopefully not at the same place as you.

 

[i=p/u]

well would cost you more in your job so id win lol

 

[SMB]

Is that reply written in code?

 

[i=p/u]

you maybe know what you have to do but not why

 

[SMB]

Okay mate.

Good luck.

 

[i=p/u]

t y

 

[SMB]

.....have a good day

 

[Paul.M]

Now now boys calm down.

Ipu, yes you can connect a lower csa cable from a busbar up to 3m but this is mainly industrial and not for a cooker hood. If the hood was within 3m of the busbar you would still have to use a FCU to protect the 1.5mm cable. If you did it this way you would not be able to use normal T&E as per the regs Malcolm has stated. Don't confuse industrial and domestic applications of the regs.

The spurring off a busbar is used for installing a new c/u or isolation switch for a particular appliance using the correct thermal protect for the cable, normal t&e would not do. In the event of a fault the 1.5 would without a doubt catch fire or explode at 300A witch is against the regs that Malcolm said.

So ipu is right on one thing but wrong in so many other ways. Back to the OP yes you can spur it off long as the flc calcs have been done and you have a FCU protecting the cable. Don't spur it from the busbar.