Cooker cable

Electromob · Mar 2, 2011

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 · Mar 2, 2011

ok ive been beaten hands down, just thought whats the difference if it goes through fcu which i said. and you said not t&e so im still wrong but right

SMB · Mar 2, 2011

Sorry, i missed the bit where you mentioned fusing down anything mate....

I thought you said....300amp fused bus-bar..feeding an un fused 1.5mm cable (and if it is within a 3m length then thats okay) ?

But perhaps i misunderstood again.

i=p/u · Mar 2, 2011

ok smb im wrong. im learner. got me sticker on me forehead

Paul.M · Mar 2, 2011

SMB said:
Sorry, i missed the bit where you mentioned fusing down anything mate....

I thought you said....300amp bus-bar....3m....1.5.

But perhaps i misunderstood again.

You did understand it correctly. The point is yes you can do it (in fp200 cable) the thing is would you do it? NOT A CHANCE. It would be like wiring your cooker up using 6A fuse wire, it would go bang soon as a fault occurred.

SMB · Mar 2, 2011

i=p/u said:
ok smb im wrong. im learner. got me sticker on me forehead

Well.....

As long as your 'sticker' says.....

"I want to learn".....and......"I will listen" Then im on your side.

Paul.M · Mar 2, 2011

i=p/u said:
ok smb im wrong. im learner. got me sticker on me forehead

Ipu, well done for trying to learn as much as possible in a short length of time, just slow it down a bit mate. It won't be long before we can take the stabilizers off your bike

.

SMB · Mar 2, 2011

paul.m said:
You did understand it correctly. The point is yes you can do it (in fp200 cable) the thing is would you do it? NOT A CHANCE. It would be like wiring your cooker up using 6A fuse wire, it would go bang soon as a fault occurred.

Under fault conditions, 1.5 mm cable, connected directly to a 300amp bus-bar wouldnt go 'bang'.....well, it might go 'bang' but it would definately burn, and so would everything combustible around it.

aye.

Melt.

i=p/u · Mar 2, 2011

yes i want to learn , and i pretend i know sometimes but just have idea. but you can come off busbar in say1.5mm into fused connection with 3m..

SMB · Mar 2, 2011

ive kind of said my bit mate. Im bored of this now. have a good evening and keep reading the books.

Or don't.

Paul.M · Mar 2, 2011

i=p/u said:
yes i want to learn , and i pretend i know sometimes but just have idea. but you can come off busbar in say1.5mm into fused connection with 3m..

Please mate let's not go backwards, as before yes but its done in industrial installations.

Another thing ipu is that people come to this forum for help and advice and if anyone looks at what you have written will think its ok to connect any size cable to a busbar in a house and end up setting it on fire or frying themselves. It's good to ask or debate what we don't understand but better to give a full answer so there is no misinterpretation and everyone is safe.

i=p/u · Mar 2, 2011

drink bad for you. ok.. its not good point at all but the fuse within 3m would protect the cable and any fault current should be cleared before gets to high temp. is why its allowed. im not even sure if il ever come across it. case closed. you got a straw after listen to me

i=p/u · Mar 2, 2011

paul no-one would take the chance with out being 100% sure, and is stated in thread cant be done without correct calcs.

Paul.M · Mar 2, 2011

The point is, the 3m of 1.5mm is protected by a 300A fuse and therefore not protected at all. The FCU would only be protecting the cable after the FCU. What would happen if someone damages the 3m of cable with a nail? How many amps would they get? I bet the cable would burn out first but by that time your dead!

i=p/u · Mar 2, 2011

has to be in enclosure (mechanical)

Paul.M · Mar 2, 2011

i=p/u said:
has to be in enclosure (mechanical)

But didn't you say earlier that it would be cheaper just to run the 1.5 from the busbar to the FCU? Now with mechanical protection the price on parts and labour are going up. Let's face it, shall we just use a mcb from the busbar to the appliance, there we go nice and simple and cheaper. Or if there isn't a spare mcb, tail off the busbar to a 2nd c/u or stand alone mcb via a double pole isolation switch. That's the correct application for the use of a cable coming from a busbar within 3m, not a spur to a cooker hood.