Need some help

[JackSmith]

Hi, I recently completed an apprenticeship and I am going to be wiring in a new cooker for a friend at their house, they've never had an electrical cooker before. I worked out the load is 9.25 Kw , which means a new fuse way / cooker switch / 10 mm2 cable, right? bu in the manual of the cooker it says the supply cable needed is only 2.5mm2, so does this mean there will be a step-up transformer inside the cooker, I am going to just spur from a local socket into a fuse spur and then into the cooker switch, but as the info i have must be wrong about the current it is pulling, as the manual says only 2.5mm2 cable is needed, how can i work out which size fuse i should put in the spur? and is this right??

any help is much appreciated,

Jack

[wislum]

Hi,

Firstly unless you possess a Part P qualification you are breaking the law by addaing a circuit to your friends property as a new cct is a notifiable change to the installation.

Therefore what current is used and what size of cable is required is purely academic as you are not allowed to do the job.

[ringworm29]

If you was an apprentice plumber could you pipe the gas up to the cooker and test it if you were not approved by corgi or the new gas approved company?

[akaboosi]

Your BS7671 OSG will tell you about applying diversity.

9.25kW will be full load of the cooking appliance.

10 amps + 30% of full load in excess of 10 amp and then add 5amp if a socket is incorporated in control swich.

23.4amps without socket. 28.4 amps with socket. Therefore 6mm2 twin and earth cable needed. 2.5mm2 butyl flex for connecting from connection plate to cooker.

And depending on how you run your cable it will probably need rcd protection. Oh and a 32 amp breaker will do.

The only cookers I've seen running off a 10mm cable is the larger range cookers.