4mm to 2.5mm on radial

[JohnW2]

It could be that there is a 4 milli feed leaving the CU, then it splits into a 2.5 ring final.

Yep, and I would say that would be, at least in spirit, a 'compliant lollipop circuit'. However, given that we are uncertain about any of the cable sizes, and don't know whether there really are any 'rings' of any sort, none of this can be anything other than speculative guesswork. It might not even be the easiest thing in the world for the electrician to work out exactly what is going on when he/she is on-site. I'm afraid that we need to be patient!

Kind Regards, John

 

[sparkwright]

With the power off, you need to remove a socket which has two cables, and test for continuity between L and L, N and N, E and E.

Then re-fit the socket, and repeat the procedure on a few more random sockets.

If you have continuity, this would suggest a 2.5mm2 ring supplied by a 4mm2 cable, which would be fine.

Obviously this test would only give guidance as to what you have, it may not tell you everything.

 

[Richely]

Thanks, I will try testing at weekend, the electrician is busy until new year so would be good to find out more if i can in meantime.