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kingeri

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I was at a job on Friday in a big 4 storey house. One of the jobs I was there to do was to add sockets to a bedroom which actually didn't have any at all. The top floor sockets were on there own breaker, a 32A RCBO actually. There were two 4mm^2 T&Es at the RCBO so I initially thought it was a ring. When I found the other ends of these cables in the top floor loft area, they were both terminated in a junction box and a 2.5mm^2 ring was run from there. So, a lollipop circuit with conductors in parallel forming the initial feed (the 'stick' of the lollipop). I actually didn't have time to start the sockets so I will be there tomorrow to do it.

I am interested to know who would leave the circuit as it is and just add the sockets to the ring part of the circuit, and who would convert the circuit into a full ring (easily done with an extra JB next to the existing one). The last option would obviously result in a ring with 4mm^2 legs of equal length and the 'loop' section in 2.5mm^2. Thanks!
 
Sounds like a hybrid/ring circuit where you may have as an example ,an old 6mm twin that was used for a cooker circuit, then a ring final is ran from the 6mm , all connected in an contactor or isolator fed from a 32mm OCPD
 
I would leave as it is, just a personal preference but I don't like ring final circuits made up of conductors with differing csa.

I know what you mean. I think I might use one 4mm^2 to serve the existing sockets in bedroom 1 as a 20A radial and use the other to serve my new sockets in bedroom 2 and on the landing on a second 20A radial.
 

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