3 x RFC all with no continuity

[JosephandAmber]

Working on an empty property which has 4 RFCs. 3 of these are showing no continuity across R1 R2 and Rn. The wiring is around 30 years old and each room has 2/3 single sockets. Each of these sockets is fed by a single 2.5mm T&E. What's going on here? Is it likely the sockets are being fed from a ring under the floor with a junction and spur for each socket? This could give plausibility for their being a break in one of the junctions but it just doesn't make sense. I'm heading back tomorrow to investigate properly but keen to know if anyone has come across similar before?

 

[Wilko]

Currently 32A. Marked as ‘rings’ on the existing cables, each with two cables terminating in the CU hence I’m treating them as such without yet having managed to find continuity.

Hi - well if there is no end to end continuity of L, N and CPC at the board, then I suspect they were never installed as a ring. It’s ”normal” for one conductor to lose continuity with a poor connection but I’ve not seen all 3 and in all 3 circuits, just saying. Is there a test sheet that shows (historic) continuity?

 

[7029 dave]

So no crossed legs no end to end continuity, only 1 pair present at socket outlets, leads me to jb radials.

 

[Mike Johnson]

Well I think we all have reached the same conclusion, the ring has been broken mid run into two radials off the same MCB this could be confirmed with a check from socket's to CU. C'mon Joseph put us out of our misery.

Then why only one set of conductors in each socket, T&E taken out to re-use elsewhere. ?

 

[Deleted account]

post 2 needs answering.

 

[Gavin John Hyde]

I see cables labelled ring all the time. Cooker ring. Light ring. Immersion ring. Was never a ring final circuit but back a few years thats what people called circuits.
A guy in his late 50s asked me round to change a light recently and said the lighting ring does the whole house. Of course it was a radial circuit!

 

[westward10]

Strangely enough I was tracing a line to earth fault around some office wall lights, one circuit with mcb banging straight out. We have a 2.5 T&E radial to the grid switch, from here two 1.5s which I assumed split either side around the office but I had the fault on both sides so something made me do a continuity check and sure enough the two cables were a ring.