ring final

  1. S

    Ring final circuit results.

    Hey guys as some of you will know I'm studying electrical installation at York college. I've been trying to get some practice in with my MFT. My results were for the ring circuit. r1. 0.65 rn. 0.65 r2 1.06 Sockets. I was getting in the range of 0.31 ohms and 0.33. I had to open the sockets...
  2. N

    Extending ring final - any potential gotchas?

    Hello again, been a while. I'm wanting to extend a ring final and I'm at the 1st fix stage as part of some building work to open up our ground floor. Following demolition, a 2 gang socket is redundant in place, so my plan is to extend the ring and add 2 further 2 gang sockets. To join into...
  3. 154988

    UK Local RCBO protecting ring final alteration.

    Hi I completed a job recently where a hotel reception had a new desk fitted. The old desk dado was supplied via an RCD spur from the existing ring. This ring is fed from one of the very old Merlin single phase boards which I’ve been told you cannot retrofit Schneider ic60n RCBO’s in. I had to...
  4. G

    Issue with r2 reading on ring final circuit due to parallel paths

    Good evening, Been on and off on this project, they’re all brand new flats and now I’ve come back to carry out EIC tests. It’s all first fixed in steel conduit and have stud frames with caddy clips on, so naturally been told to earth back boxes. Before I left I mentioned to the QS running...
  5. L

    UK Low voltage from live to earth, on a ring final.

    Why do I only get 50v from live and earth, I’m getting 240 from live to neutral. The circuit is a ring.
  6. A

    Fault on Ring final circuit

    Please advise what I should test / check next. My usual qualified electrician who did all of the work here is in Ireland for 4 weeks and not contactable. I need to fix this asap. Ring final circuit tripping. I am not clueless and I have some test gear. Can fully isolate the supply with an...
  7. B

    Shower on 4mm ring final circuit.

    Hi, I've got a customer who wants a 10.5 kW shower installed in his bathroom. As it happens he already has two unused 4mm T&E cables run from the CU cupboard to the loft. I know it's unconventional but is there any reason I can't use these cables to make a dedicated RFC for just the shower...
  8. V

    Unusual Ring Final Tests

    After fixing a few CPC related issues on a ring final I got the following results L-L = 0.47 N-N = 0.47 CPC-CPC = 0.69 R1+R2 Tested at 0.31 R1+Rn Tested at 0.25 All looks good, until that is I realised that the CPC-CPC is actually not quite right. It should be 0.78 (0.47 x 1.67 for a 2.5/1.5...
  9. S

    Help with Ring Tabulated Current Equation

    Hi there I am struggling with the following calculation. 4mm Ring Final Circuit, In = 32A Cg - group of 6 with a correction factor of 0.57 Ci - 50mm insulation of 0.78 It = In/CgCi It = 32/0.57x0.78 It = 71.97A Then I get stuck here: Ib < In < It < Iz 4mm Cable from Table 4E2A gives Iz of...
  10. P

    Ring Final Circuit (RFC) versus Radial. Yes, again.

    This is a topic that comes up a lot and seems to attract near-religious levels of fever in how folks argue over the choice of circuit for UK sockets. However, often the arguments are ill-informed or they veer off in to pointless corners, or sometimes get personal. This is my attempt to put a lot...
  11. S

    Loading on an existing Kitchen and living room 32amp ring final

    Bit of advise if anyone has time.. I have a customer who brought a new kitchen from wrens. Customer has had the route to the kitsch redecorated 6months ago. I’ve found a route which means 25meter going externally and I quoted to supply new 6mm and ring circuit. They are supplying Oven (13amp...
  12. J

    How would you meter (kwh) a ring final

    I have a customer that requested kwh meters on the socket circuits of an office lock he rents out,(rooms are rented separately). There are two 16amp radials which obviously are not an issue, But the ring mains 4 of are causing me a headache for obvious reasons! The question is how would you guys...
  13. C

    why would i get 0.00 on Ring Final for R1+RN?

    Hi so i am doing a test on sockets on a ring Final circuit for family member. Got my end to ends r1 0.62, rn 0.64, r2 0.97, identified opposite r1's+rn's for figure of 8 joined in connector blocks. set up Kewtech KT63 multifunction tester nulled leads and plug adapter and tested at sockets at...
  14. J

    Ring Final Circuit - spurs only

    I read that it is against the regs that a ring final circuit cannot be just a ring with with spurs off it. In short, a ring must have sockets on it which double up as junctions. I find that hard to believe.
  15. S

    Ring Final discussion

    Hi all, I had a fault on site today I've not encountered before. if anyone could shed some light on a similar fault they may have encountered before that would be helpful. I was changing some damaged socket fronts over and I noticed the cables had signs of over heating so I thought I would do a...
  16. M

    Maintenance Free 32A Junction Box

    I've been looking at the Wagobox, specifically the 221-4 box, and noticed that it is only classed as maintenance free if the current is 20A or less (derating factor applied to the 32A capacity of the Wago 221 Series 4 connectors) and has a tie-wrap fitted. Do you know of any Wago maintenance...
  17. W

    Wiring of ring final circuit

    Always ask fellow sparks this and always get different answers, what do you feel the quickest way of wiring a ring in say a flat for example. Do you piggy back it round getting your 2 legs into each room before dealing with the wiring of the sockets in each room. Or do you just wire to each...
  18. T

    Ring final routing in loft conversion

    Good evening All. Maintenance electrician here moving into domestic installations. What I'm still struggling with is the ring finals routing, especially in loft conversions. I am wiring one at the moment. Can you please have a look at the diagram below. Apologies it's very basic and rooms are...
  19. T

    Running ring final cables in loft eaves

    Hi All. I am wiring a loft conversion and want to avoid covering cables in the insulation. I can clip the cables to the studs on the other side of the wall in the zone parallel to the socket outlets. Is this sensible thing to do or would you rather run in the holes through the joists and apply...
  20. V

    Have come across a 16A Ring Final

    I've not come across this before. The current regs state it should be on a 32A MCB. I've been asked to re-wire a bedroom which will involve extending this ring. It already serves two other bedrooms and the lounge. I know I probably should tell the client to upgrade this MCB to 32A, but is it...
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