New Cooker circuit, is this ok?

[Jonnyk]

Hi guys

I Have been asked to install wiring for a new hob, with extractor hood, the hob instructions say it requires a 30A minimum supply, the hood is only about 200w

Would it be ok for me to install a dedicated ring circuit, in 2.5, for both items, or do i have to give the hob its own 6mm radial?

Any responses appreciated!

 

[GLENNSPARK]

well for a start..we need the installation method......and i also suggest you take a look at table A2 which you will find on page 111 of the on site guide (1st)...

 

[Jonnyk]

Dont have guide in front of me at the minute, Twin and earth, about a 4m run, inbedded in the wall

 

[GLENNSPARK]

well its the first 10A....then 30% of whatevers left....thats your diversity allowance.....work your cable size off that......MCB/fuse to suit.....

 

[D80]

If such a short run why not pull in 2 separate circuits, 6MM for cooker and 1.5MM for extractor?

 

[Jonnyk]

Ok thanks, I havent physically seen the hob yet to see the ratings plate but assuming for now the cable can carry the current, are there any other reasons you can think of I cannot use the method mentioned, regs wise?

 

[Jonnyk]

two seperate circuits is an option certainly, just wondering if the method stated is also

 

[micknew]

Because your not an electrician?

 

[Jonnyk]

I am actually, not on the domestic side usually

 

[GLENNSPARK]

If such a short run why not pull in 2 separate circuits, 6MM for cooker and 1.5MM for extractor?

and why a 1.5mm for the extractor.....1.0mm more that sufficient here.....

 

[Jonnyk]

Thanks for the replies guys, ill just run in a 6mm and spur the extractor from the existing ring

 

[telectrix]

was wondering why you would want a 2.5mm RFC when a 6mm radial is easier. 6mm on a 32A MCB. to cooker isolator is best bet.

 

[GLENNSPARK]

why 6mm?.....the o/p needs to see the rating of this appliance first......it seems like..if in doubt...reach for the 6mm....may be a 4mm will cut it.....

 

[mogga]

I understand your thinking Glenn BUT if this hob goes bobies up and a new one is insalled it MAY be of higher rating so would require cable upgrading

 

[Jonnyk]

6mm on a 32A MCB. to cooker isolator is best bet


Yep this is the route im going down, for the reasons Mogga has already mentioned

 

[GLENNSPARK]

I understand your thinking Glenn BUT if this hob goes bobies up and a new one is insalled it MAY be of higher rating so would require cable upgrading

fair comment mogga......

 

[D80]

and why a 1.5mm for the extractor.....1.0mm more that sufficient here.....

In a 4 metre run the savings aren't worth noting. And I generally would have 1.5mm to hand, not 1.0mm:goofy:

4MM would probably do for the cooker, but 6MM is better in case of changes down the line, bigger hob fitted etc. With such a short run the cost of cable is going to be minimal anyway.

 

[GLENNSPARK]

In a 4 metre run the savings aren't worth noting. And I generally would have 1.5mm to hand, not 1.0mm:goofy:

4MM would probably do for the cooker, but 6MM is better in case of changes down the line, bigger hob fitted etc. With such a short run the cost of cable is going to be minimal anyway.

well that sounds fair.....its just that i keep seeing 6mm mentioned in this forum.....when it just aint necessary.....it also says to me that there are some coming in here asking away.....who cant get their head around diversity and/or cable calcs......

 

[spark 68]

In a 4 metre run the savings aren't worth noting. And I generally would have 1.5mm to hand, not 1.0mm:goofy:

Besides 1.5mm cable is the minimum csa allowed for S/O's or FCU's.

see App 15/15B (BGB) the Note at the bottom right of the page.

reg 524.1 and table 52.3 (BGB)