final

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  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. S

    Unbalanced final ring

    I have seen a final ring that had the heavy appliances on one leg (L1). Drawing 19.5 amps in total, one leg (L1) was drawing 82% of the 19.5 amps of current. If the ring went up to 32 amps the 2.5mm cable would in theory be just safe enough under the 27 amp maximum. My question is, if 32 amps...
  7. M

    EICR Report - Advice regarding remedials & final Certificate

    This is a Situation I haven't run into before, I do all the smaller to medium sized maintenance and electrical Jobs at a Local Educational Premises, this building was a new build in 2014 . There are 13 large three phase Distribution Boards, the last EICR in 2019 was completed by a Testing...
  8. 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...
  9. 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...
  10. 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...
  11. 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...
  12. W

    what is the formula for calculating PSCC for final circuits?

    hi in college and watched some YouTube videos and read up on things I think I got the right formula but I'm not sure. Zsc= Zesc(or Zdbsc) + (R1+RN) (R1+RN) = milli ohms/metre x length x correction factor and then divide that by 1000 Zesc = Uo divided by PFC Then add together Zesc and (R1+RN)...
  13. 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...
  14. 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...
  15. 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...
  16. N

    Reported content: Post in thread 'Domestic - Swapping out 2 gang for 2 FCU on 32A radial final'

    Post in thread 'Domestic - Swapping out 2 gang for 2 FCU on 32A radial final' by ninemaverickbars has been reported by ninemaverickbars. Reason given: Content being reported:
  17. N

    Swapping out 2 gang for 2 FCU on 32A radial final

    Hello everyone, Back again after receiving great advice for the bathroom a few months back. This time I'm making a mess in the kitchen. We have a 32A MCB to radial final which goes to a cooker control switch which also has an integrated 1 gang socket. Off of this is a double socket which...
  18. 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.
  19. K

    under floor heating 32amp final ring advice needed

    Hi all looking for some advice as a non sparky , be gentle :) To be clear I wont be doing the work myself , just want to be better informed. I already had an underfloor heating mat rated at 6.8A installed in my kitchen , this worked off a fused spur (13A) on the kitchens 32amp Ring final...
  20. J

    Explain the process of Designing a Final circuit

    I have been given this assignment "the drawing below shows the floor plan of a small factory with the electrical symbols. Explain the process of designing the final electrical circuit that supplies all the elements 6 . The total length of the circuit is 25m. Any assumptions you have to make...
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