ring final

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  1. J

    UK Find a Fault on a Ring Final Circuit

    I am not a qualified electrician, I was employed as an electrician after my MoD electronics apprenticeship but that was 30 odd years ago. So I have basic skills and an insulation tester with a low resistance capability. This is an old installation with a new cu installed in 2014 (EICR etc...
    • john999uk
    • Thread
    • circuit fault final ring ring final
    • Replies: 9
    • Forum: UK Electrical Forum
  2. M

    C&G Level 3 Project Question (Cafe ring final sockets length)

    Hi guys I'm a bit frazzled by the wording on the main project. So, we are told to keep the max circuit length down to 30m, tutors said that isnt physically possible so just try to keep it under 40m and they noted that the socket circuit was a bit of a mental one and that the 30m guidance set...
  3. I

    Ring final circuit Zs.

    Can you get the zs by using a earth loop impedance tester. I was taught if there's 2 rings circuits, you can do r1,r2, rn /4 on 1 On the other ring you can plug in the earth loop impedance tester and measure the zs. If you do it that way you must write in the observations you measured. Have I...
    • Iona222
    • Thread
    • circuit final ring ring final
    • Replies: 6
    • Forum: UK Electrical Forum
  4. V

    CPC low R2 continuity reading ring final

    Hi, I've just been testing a ring final before installing an outdoor socket and I got an R1 and rn of 0.6, but instead of 1.01 for R2 I got a range of readings from 0.1 to 0.51 and it wouldn't settle down, so I couldn't continue the tests. I know parallel paths could cause a low reading, but...
  5. R

    Extension of ring final circuit

    Hi there all, I have a property and I have noticed the following wiring (please see below) in one of the rooms in the house. It looks like the ring circuit has been extended. A single 2.5mm Twin + Earth cable (in red) is providing power from the consumer unit which feeds a chain of electrical...
    • raj_121
    • Thread
    • circuit extension final ring ring circuit ring final
    • Replies: 8
    • Forum: UK Electrical Forum
  6. timhoward

    Insulation resistance difference both ends of ring final cct

    Initial fault was RCD tripping, narrowed down to a ring final cct. IR tests on that cct with all loads removed were showing almost zero between neutral and cpc. So I broke the ring apart and eventually found the nail through a cable, and got that all sorted. Now its testing ok in as much as...
  7. T

    4mm ring final circuit

    Evening all Pricing a bungalow that has 300mm insulation in the roof, as im going to be wiring around the corenrs as much as i can and through the middle would you use 4mm on the ring final circuits? I want to use 2.5mm radials for bedrooms and living room but my boss is old school and wants...
  8. V

    Ring Final Test - Neutral >19.99kOhms

    Just checking, what I think I already believe. Doing a pre-install test of some outdoor sockets on a ring final. So far, confirmed bonding, incoming polarity, Ze and Pfc and RCD Test on circuit, everything fine and within regs. However on testing Ring Final, Line came out fine (0.7), Neutral...
  9. J

    Coding for a Ring Final Circuit 1.5/1mm

    Afternoon all, A quick EICR question. I have found a Ring Final Circuit that has been run in 1.5/1mm twin and earth. It is RCD protected and OCPD is a 16a type B MCB. All testing has come back as expected for a Ring final that has been installed in 1.5/1mm and the measured Zs is well within max...
  10. mak

    Insulation resistance test on a ring final circuit

    Might be trivial question. My understanding is that we test on either leg of the ring since both legs make up a radial, but some say they test both legs at once, i.e. LL to NN, it would make sense if the other leg is not insulated since this is a live test, but I don't see why not if the other...
    • mak
    • Thread
    • circuit final insulation insulation resistance insulation resistance test resistance ring ring final test
    • Replies: 30
    • Forum: UK Electrical Forum
  11. E

    UK CPC missing on ring final

    Morning All, Currently carrying out an EICR and going through ring final steps with the following readings: r1: 0.31ohm rn: 0.32ohm r2: 0.03ohm Started taking sockets faces off to find that there is no cpc, only fly lead to metal patress box and steel conduit trunking. (See photo) When i...
    • Eugene Herbst
    • Thread
    • cpc final missing reading ring ring final
    • Replies: 5
    • Forum: UK Electrical Forum
  12. C

    Fault finding ring final RCBO

    Done a condition report on a old mains board, everything good apart from ring final, got 0.55 nn 33.7ll and 3.8 on ee, changed board to main switch and rcbos, carried out a full accessory swap on all sockets and fuse spares in house, found some bad practice, twisted lives, n and earth's, no...
    • Conteh
    • Thread
    • fault fault finding final finding rcbo ring ring final
    • Replies: 18
    • Forum: UK Electrical Forum
  13. W

    7 core NYYJ cable to extend ring final circuit?

    Hi, Extending a ring final circuit off a socket in the kitchen through the wall into the shed on the other side. I already have 7 core NYYJ 2.5mm cable and I was wondering if I could use that to go through the wall to a J/B then connect to singles in conduit which would add about 4 meters in...
    • Williamshoeste
    • Thread
    • cable circuit core extend final ring ring final
    • Replies: 8
    • Forum: UK Electrical Forum
  14. J

    Diversity on a Ring Final

    Hi there, I'm just trying to get myself into cable calc and my first hurdle is demand and diversity. I understand the majority of what is coming across in tables A1 and A2 OSG but I'm just struggling to clearly understand what I should be using for demand on a domestic 32amp ring final...
  15. M

    Ring final no continuity on live ends r1

    Hi, Im new to fault finding, Im on a job where there is no live to live continuity on the ring final circuit which supplys the sockets to the whole house, with new flooring recently installed I cant access the floors, im assuming there are many jbs because its a 1960s property, if I connect one...
    • Mikey1001
    • Thread
    • continuity final live ring ring final
    • Replies: 8
    • Forum: UK Electrical Forum
  16. samsingh

    UK Am2 - Ring final circuit

    Hi, I've sat my am2 practical today. I have a question about the ring final circuit hopefully there is someone who can relate. Is it crucial to wire the ring final a certain way? Ive bought 2 legs out, one goes into my closest socket which went down a bit of conduit and the other leg goes to...
  17. P

    UK Extending/breaking into ring final circuit

    I need to install some extra sockets in a kitchen. It's a single story ex-commercial kitchen. All the wiring is in singles in steel trunking in the loft space, with drops through steel conduit to the various sockets and switches. I want to install an additional 6 sockets under the worktop for...
  18. R

    Extending ring final circuits

    Hi. I have a CU move to do - around 5m from current location. There are 10 circuits, 4 of them ring finals. I'm considering whether to extend the rings 'as are', or to split the rings somewhere in their approximate middles and extend them to separate RCBOs as radials, the aim being to reduce...
  19. S

    Ring final circuit conductors and value Zs and R1+R2

    Hi all, I would like to ask you about ring final circuit canductors and schedule of test results. I have got dedicated ring circuit to supply kitchen appliances. Circuit is protected by mcb tybe B 32A. Then supply is split into radial circuits to supply appliances by switched 13A FCUs. What...
  20. P

    Radial or Ring Final Issues

    Hi all I have just moved in and am in the process of adding some sockets. Am I right in saying that I can add to the circuit regardless of which type of circuit it is as the MCB is a 20a, obviously as long as I'm using 2.5mm t+e not speaker wire etc. I get the issues with RFC where 32a fuse...

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