Tell me if i'm wrong.

[chiplard]

I am installing a new ring main in a kitchen and will be clipping direct for the whole of the installation ( new extension ). There will be an oven rated at 2.9kw that i will be running off a GRID system to a 13A FCU ( along with a combi bolier and cooker hood) . I have read on this forum that an oven over 2kw should have its own dedicated circuit but am struggling to find this in the BRB. I have found the the entry at 433.1.5 and appendix 15 ( this can generally be achieved by....), but surely if the CCC is OK then where is the problem.

Thanks in advance.

 

[Des 56]

In appendix 15 i think what they are saying is more to do with safe balancing of the ring legs when they talk of a 2KW cooker or above on its own dedicated circuit

If you were to read the Iee guide to the building regs the message is,
It is recomended that cookers are on their own dedicated circuit,however,for lightly loaded circuits (your ring main)ovens of 13 amp or less may be connected into a ring final circuit

Your oven is 12 amp ish max possible load,probably running at a lot less than that for 90% of the time .so what you propose seems fine

 

[Spudnik]

Agree with Des.

The main reasoning is to try and prevent the RFC from being loaded for prolonged periods.

 

[not clever]

Fine how you want to do it, but cant see why you dont just put in a dedicated circuit for the cooker.........................think cooker change in the future............oh bugger ...never mind I will stick my 7Kw hob & oven on this bit of 2.5 via a 1362 13amp fuse located in this nice grid fcu module..

 

[lamb]

BS7671 requires circuits to be designed so that cables do not carry a small overload for a long time period.
The guidance in the appendix about loads of a specific nature (long time periods) over 2kw not to be designed into a ring final circuit offers a way to achieve the above requirement, and avoid an overloaded leg of the ring.
In practice nothing bad will happen if you connect a 3kW oven into a RFC, but it would be bad design, so at the design stage I would choose not to ignore this advice from the appendix.