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ring final

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  1. R

    High Zs on ring final circuit

    Good morning, I was recently at a job and had a discussion with another Electrician regards a high Zs reading on a ring final circuit. R1+R2 measured 1.68ohm Ze 0.18 Tncs This puts the circuit over the permitted zs. I begun seeking out the issue. However the other electrican said...
  2. Soulsurfer

    Concerning R1 + R2 and r1,rn,r2 ring final results ?

    Hi all, Can anyone shed any light on some strange really low readings on a ring final circuit I've just 2nd fixed including replacing some legs as the IR was bad in places on old cabling before. Thought it could be my MFT batteries going and therefore giving possibility of silly results but...
  3. Peter Monfort

    Ring final circuit question

    When you do the continuity test on a ring final circuit and you have to connect L1 to N2 and vice versa, this assumes you know which L cable is the incoming or outgoing. I understand that if you connect L1 to N1 and vice versa the ohm readings rise then fall as you go round the ring circuit...
  4. B

    Can you calculate ring final conductors if you have a measured R1 + R2?

    Hello there everyone, I've dead tested some ring mains on a job recently but unfortunately I didn't do my measured end to ends. The circuits only have two spurs on each. I have my R1 + R2's, it was wired in 4mm T and E so the earth is obviously 1.5mm. For example, if one circuit measured...
  5. N

    Dead tests on a ring final prior to energising

    Testing using a socket tester at the sockets gives me unexpected readings, based on little r calcs, eg, outside allowed variance Using the probes on the terminals gives me 'Texbook' readings expected from a new install. Should I conclude the accessories are dodgy ? They are DP double gang...
  6. Lee Gold

    Ring final circuit help

    Hello can someone explain to me how a ring final circuit with 4 twin socket outlets work from the fuse board? I mean would you just have a line neutral and earth coming out the fuse board. Linking from sockets in radial back to the fuse board? Just want to know how it works what connections...
  7. 8

    Domestic: 20A DP switches and ring final circuits??

    Hi all :). Seeing alot of cases where I have seen 20A DP switches in a kitchen (for example) each feeding a radial 2.5t&e to each white goods appilance or similar, and the 20A DP switch primarys are fed from the 32A kitchen ring final circuits - Is this accepteble to BS7671? I'm guessing...
  8. M

    Dedicated ring final used to serve heating panels ?

    Afternoon, here's the proposed setup I am planning to supply 9 off 600w IR heating panels from a ring final circuit the installation is commercial and the panels will be fitted to a suspended ceiling a contractor and thermostat will control the heaters the circuit is fed from a 32a rcbo in...
  9. M

    Ring final end to end test

    As doing a cu change ,I have a ring final in a house with an end to end reading on r1-r2-Rn are so low that somewhere very close under a floorboard the ring must have been connected together somewhere, customer refused to pay more, so i have put in a 20amp mcb. To comply with current rating of a...
  10. Soulsurfer

    Ring final fault.

    Hi I have just looked at a friends place and she asked for a test on the CU as she thought it looked tatty ! It is, ran first ring o.k. Next ring seems to run zig zag fashion up & downstairs and to random outlets like a drunk wired it in ! Problem came when testing end to end I got r1 > 2000...
  11. happysteve

    Current carrying capacity of a ring final circuit - grouping factor?

    Eh up :) I'm trying to challenge myself with scenarios where I'm not sure if my interpretation of the calculation rules + regs is correct or not. RFCs are doing my head in. I think I understand most of the theory: - 433.1.204 lists a specific case where a RFC protected by a 30/32A protective...
  12. A

    2.5mm2 Ring Final Circuit vs 4.0mm2 Radial

    I recently read an article about the advantages of both the RFC and Radial circuits, after which I must admit that I am more swayed towards the Radial. What are others thoughts? What do you prefer and why?
  13. S

    Continuity of ring final on radial circuits

    Stuck on Unit 304 Task B, the question states the method on how to carry out a ring final test on a radial circuit. Thanks
  14. I

    Fused spur from ring final for exterior lighting

    Trying to calculate the voltage drop for a run on external lights supplied via 5Amp Fused/rcd spur from local ring final circuit. for a quotation and have got a bit confused re Voltage drop. 27m run in 1.5mm cable total load on lighting radial 420w. (no diversity as all lights either on or...
  15. C

    400v through a ring final circuit

    Hey guys, I had a callout the other day, 7 fan coil units where not working, these where supplied via a ring final circuit and once all unplugged the circuit engaged, I latter discovered all fan coil units had a dead link between line and earth under a 250v insulation test. The manager and...
  16. S

    Ring Final Circuit testing, What is wrong. Trainees only to answer please.

    You have been asked to carry out a full test on a ring final circuit. It is wired in 2.5mm single core cables. (I have made the test result values up to make things easier to work out). You have confirmed that the ring is continuous, and your r1 value is 0.5 ohm, your rn is 0.5 ohm and your r2...
  17. kkkkk

    High continuity resistance on ring final circuit

    Hi peeps I have continuity measurements on a ring final circuit of: L/L 1.4, N/N 0.78, E/E 1.7 Loose connections somewhere? There is a new CU with RCD. Insulation resistance measurements are good. There is a boiler added into the circuit as a spur. Any suggestions or comments? THANKS!! :) :) :)
  18. P

    dodgy ring final

    Hi need some advice, changed a db today everything was fine until testing ring final,there was no continuity on r1 r2 rn so no ring now but the 1 leg is supplying power to all the sockets in the house so basically a radial, it was on a 30 amp old fuse so changed to a 20 amp mcb did a i/r test...
  19. H

    Continuity of ring final

    Hi guys I am new and struggeling. Can any one pleas tel me why r1+r2 have to be divided by 4 pleas
  20. R

    no cpc continuity on ring final, strange readings !

    Good Evening all, Been at a property today starting intial tests for a board change tommorow. There are two ring circuits, on one of the ring circuits i had an open circuit on the cpc. Live and neutral where fine 0.4/0.4. I started to locate the break by splitting the legs and joining the live...

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