Installing a new oven & hob - cable and MCB size

[Paul Downham]

Hi all,

my 1st post on the forum so please be gentle!!

I am about to install a new oven and hob in a gutted kitchen. No fuse yet, no circuit cables installed. Could someone just confirm that I am correct with my selection.

Oven 2380W
Hob 6600W

Total 9Kw, works out to draw 39Amps.

If I wish to power both from 1 circuit, 10mm T&E (enclosed in thermal wall) can carry 46Amps. So, Cable is up to the job, a 45Amp breaker will cover the load AND protect the cable.

I run the 10mm cable to a 45A fused cooker switch, run this down the wall to the cooker point and then connect both oven and hob to the point. All protected by the 45Amp MCB!!

What do you think?

All the best, Paul

 

[Paul Downham]

Hiall,

final solution as follows;

6mm radial for the hob, feed side into a cooker switch, load side to an outlet, cable protected by 32Amp mcb.

13Amp fused spur for the oven, feed side connected into the kitchen ring, load side to the oven, then if the fuse blows the ring continues to operate.

One final question, cooker switches, are these rated at 13A, 20A & 45A only? If so, as this hob draws 28A max, wouldn't a 45A cooker switch rating be too high or will the MCB be sufficient enough to cover it?

 

[cagedanimal2010]

the cooker switch rating refers to how many amps that cant take before it fails. i cant see a problem with putting in a 32a double pole switch.

danny

 

[pennywise]

6mm supply on a 32amp breaker to a cooker isolator with an integral 13amp point, mount in cupboard adjacent to the hob and plug in the cooker to the 13 amp point.

 

[cagedanimal2010]

good idea pennywise!

 

[Paul Downham]

Hi all,

many thanks for all of you help with this today.

This forum is brilliant!! I will be posting much more.

I am a qualified spark, just done 17th edition and now need to tackle inspection of my own work. Just about to sign up with NICEIC and this is one of the jobs I will get them to inspect. Any ideas on part p testers? Oh, and I don't have £100's to spend, what about a kewtech KT61??

Paul

 

[cagedanimal2010]

think thats down to personal preference, iv all way used fluke so when i went part p brought myself a nice shiny new fluke1653b, the way i looked at it is i only hope to by 1 of theses. so i forked out!

danny

 

[Wiredspark]

6mm supply on a 32amp breaker to a cooker isolator with an integral 13amp point, mount in cupboard adjacent to the hob and plug in the cooker to the 13 amp point.

Mount in cupboard????? And then in the event of a fire you have to open the cupboard, pull out all the rubbish in the cupboard and lean intot he back of the cupboard and isolate your cooker supply (hmmmmmmmmmmmmmmmmmm, not a great idea)

 

[pennywise]

Mount it at the front of the cupboard then, Alternatively, 6mm to a dual 35mm box put two 32amp cooker switches in, link them then put two 20mm conduit drops with 6mm T+E, to two individual single back boxes one with a 13amp single gang plate the other with a cooker outlet plate with some H07 flex to the hob, If you don't want to cut out the backs of the cupboards to access the single socket or the cooker outlet do the drops in 20mm flexi conduit to the kitchen cupboards and mount the single socket and the cooker outlet in the back.