Published: 6 February 2009
Category: Q&A
Our Voltimum Experts answer your questions on a daily basis in our Technical Expertise area. This one, about BS7671: 2008, a specific circuit, and a perceived lack of clarity in the Regulations, is answered by SELECT:
Question: Using a 2.5mm twin & earth PVC ring, and sockets with two earth terminals, and the circuit protective conductor (CPC) terminated separately at each socket and the board, do I still need to run a separate 4mm? Looking at the 17th Edition Regulations (p133), 543.7.1.3, point (iii), paragraph two, this is unclear. As a rule, we install a separate 4mm, but looking at that got me thinking!
Answer: For a socket-outlet ring final circuit, Regulation 543.7.2.1 applies. 2.5/1.5mm cables meet the requirements, provided that they are separately terminated at the distribution board and sockets, as you have described.
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