Help a poor student whose hand in is tomorrow!!!

[Outspoken]

As a reference for both you and your tutor I would refer you to Appendix 15 of BS7671:2008 Ring and Radial Circuit Arrangements : Regulation 433.1 on pp425.

Regulation 433.1 in the title of the Appendix directs the reader in pp81 and specifically 433.1.103, I strongly suggest you read it before proceeding and ensure you understand it.

 

[lazy student]

Ok having got a copy of the regs (don't ask how i did that at 11pm), I think the problem arose because I had forgot that the circuit is "unlikely to exceed for long periods of time the current carrying capacity of the cables" (433.1.5)

Cheers for all the help gents

Lazy