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  1. 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...
  2. 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...
  3. D

    Radial final circuit

    Hi guys, just started rewiring my house, and noticed the sockets in the attic wired in radial instead of ring. Can I leave it in radial? There are only 2 sockets up there, unlikely there will ever be much load on it. I was thinking of wiring it 2,5mm2, (as it is now) on a 16A beaker. Any...
  4. S

    Supply and final circuits for stables.

    Hi all, just looking for advice prior to a potential upcoming project supply stables for horses. The supply characteristics into the main house is TNCS and the stables are located approx 40m away from the building. I am thinking of putting a 1w non-rcd protected consumer unit at supply end...
  5. 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...
  6. Marcus Vaughan

    Shaver Socket from a Ring Final

    Hi All, A customer has asked for a shaver socket to be installed in his bathroom. The only issue is that there is no lighting circuit available (loft conversion above and no access to the eaves). His idea was to come off a socket in a bedroom on the other side of a stud wall to the proposed...
  7. Sparksaflyin

    clever ways of ring final test without removing spur fronts??

    Morning fellas. I know from regular visits to this website that we have some rather intuitive Sparkie’s on here so I thought I’d join in the fun. I’ve got a rather basic question to start with but also where some of you can hopefully show your tips and tricks. Im currently working on a...
  8. Dan

    18th Edition Training Course - Online with Offline Final Exam

    18th Edition Training Course - Online with Offline Final Exam Level 3 Award in the Requirements for Electrical Installations BS 7671: 2018 Online 18th Edition Course – Available From July 2018 This course has been developed with the aim of enabling the candidate to demonstrate that they are...
  9. KeenPensioner

    Can't figure ring final r1 + r2 divided by 4

    Hi...keen amateur here......don't crucify me for asking!! I understand Ohm's law and I understand the mechanics of measuring end to end on ring final and then joining incoming live to outgoing neutral etc, and I know that this configuration gives a figure of 8 (in fact can be straightened to...
  10. J

    Hand dryer off ring final

    HI everyone, Is it acceptable to wire a hand dryer from a ring final in to a 13 amp FCU. The ring main in question has 30MA RCD protection. Or, is it best to wire a new radial circuit for it?? There is a socket I can spur off that is easy to get to. Thanks
  11. Marcus Vaughan

    Power to an Outside Office - Spur from Ring Final?

    Hi All, Just looking for some reassurance on a job I've looked at today. My status is that I am trying to stay within the realms of 'Minor Works' until I get a bit of experience under my belt. Conscientious decision - but everywhere I go it seems that notifiable work is needed as well...
  12. Andy78

    18th edition final changes released by IET

    Changes in the 18th Edition IET Wiring Regulations - IET Electrical -...
  13. L

    Final Circuit Protection

    Hi Everybody Why fuse is no longer use in Final Circuit Protection. Instead, Circuit breakers are used. So far, I know that CB is more sensitive than fuse. Can someone depicts any reason and their respective curves. Thanks
  14. Marcus Vaughan

    High(ish Zs and extending ring final question.

    Hi all. Love the forum by the way. I do have a question though... I have just visited a house (on a Sunday!). Customer is asking for additional sockets onto 32amp ring final. Circuit is 30mA RCD protected. Wiring is 2.5mm/1.5mm tinned copper. Thought I’d better do a live Zs test. Zs = 1.29...
  15. B

    Fault finding on ring final circuit

    Fault finding on ring final, is this the readings you would expect to achieve and are these the correct way to find them thanks
  16. 7

    Ring final testing question

    Testing my extensions wiring today and noticed cpc fails continuity. Howevery I have continuity from outward leg to main earthing bar in CU Any ideas how ?
  17. T

    R1 R2 socket test on Ring Final Circuit with megger leads

    So with megger leads they are not too happy in a kewtech socket tester so what do you do when you want to do this use kewtech leads on the megger? The megger leads clearly do not fit into the kewtech. Just use the plug lead?
  18. A

    R1+r2 reading and r1,r2 and rn on ring final

    Hi there Been stuck on this for a while. What is the maximum r1+r2 reading possible on a lighting circuit in a domestic property. With a type b 6amp breaker. Also if you guys could tell me about r1+r2 and rn Maximum readings for ring final. Thanks
  19. D

    SY cable for distribution circuits and final circuits

    Hi all, Just a question relating to SY cable and the use of SY cable. My boss his carrying out a EICR for a industrial premise and coming across a lot of SY cable. These cables are used for final circuits and distribution circuits. I know that BS7671 list SY cable as non - standard cables and...
  20. Marcus Vaughan

    High r1, rn, r2 etc on ring final.

    Hi All. I had a job which was going to be a 'quicky' fault finding and repairing a couple of sockets, then it came to the testing..... The consumer unit gave me no cause for alarm but was all labelled up wrong, so it turned out there were far more sockets and square meterage on this ring final...

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