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  1. T

    Ring main r1+r2 reading really low - 0.01?

    hi guys just wired up a new ring main for a house, confused on the test results though, firstly all other ring mains in the house that are new are okay and have came out as expected, tester has just been calibrated and batterys are okay and the ring main is a true ring... am using a metrel...
  2. NDG Elecs

    Fluctuating IR reading.

    Hi One and All. Fault finding today. Narrowed it down to one leg of RFC between N&CPC. What puzzled me was the fluctuation in the IR test. Normally I find the reading stabilises after a short period (5-20 seconds). Today the reading was constantly jumping between 20Mohms with an occasional...
  3. B

    No R2 reading on ring

    Hi guys, New to testing but been doing installations for about 5 years now. I've come across a problem where the ring I'm testing has no R2 reading, I've split the ring and done a r1+r2 test to find out which leg it's on. Problem is I don't know how the ring was wired. Is there an easy and...
  4. A

    Hight r1 + r2 reading

    Is 2.07 a satisfactory readinf for light lights r1+r2 and plus got a reading of 1.02 for zs on sockets.
  5. S

    Heat mat fault, neutral earth reading...

    A neighbours underfloor bathroom heating mat stopped working a while back, she asked me to look at it today. Turns out when it was installed the joiner had accidentally burst the cable for it. It's a small thin blue cable that heats up that has two conductors & an earth. Someone has done a...
  6. 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
  7. Gavin John Hyde

    Lower Ze reading than expected

    On a job today and when testing got a Ze of 0.03 ohms on a tncs. Using a Kewtech 64DL. Installation has main fuse in hallway outside the 2 bedflat then a switched fuse feeding a submain cable to the actual CU. I did Ze at both immediately before switched fuse and in CU with earth disconnected...
  8. S

    I Need Work Looking for Job in Berkshire

    Hello, I have recently relocated to Slough. Currently looking for Electrical Engineering related job anywhere in Berkshire & London. I am trying hard to get a job but not yet successful. I am wondering if anyone could suggest or recommend me any engineering job. Even I am happy to work as a...
  9. S

    Urgent, advice needed about reading the FRAM on an Ampy 5235A meter.

    Hi, Please can anyone advise me as to who would be able to read the internal memory via the IEC 1107 port of an Ampy 5235A meter. I had one installed as a check meter years ago which was left in place & I believe it holds the data I need to claim back from my supplier all unused exported energy...
  10. C

    New Member with an EICR question on max Ze reading

    Afternoon Ladies & Gents, I'm a new member to the forum so thought I'd introduce myself. Been qualified for around 10 years and have finally set up on my own. I am new to the test and inspection side of things so I am seeking advise on the following question. Any help would be greatly...
  11. A

    TNCS High ZE at origin

    Hi there Testing at origin of a domestic property, I have found: L-N: 0.44 Ohms L-E: 9.89 Ohms I had the DNO attend clients address, there response was that it was quite high and confirmed readings of 0.44 for ZE. (Pleasee attached document with their response) My concern is they don't seem...
  12. S

    Hiring for Electrical testing engineers in Essex, London, Cambridge and Reading

    Electrical Installation Engineers needed to carry out testing and minor remedial works in domestic properties. Vacancies in London, Hertfordshire, Reading and Cambridgeshire on a permanent basis with immediate start available. Engineers must hold their 17th Edition qualification, ECS and...
  13. P

    Strange earth reading on ring main

    Hi guys. I have just tested a ring main. The readings end yo end on the 3 conductors were all fine. When I cross connected the live to neutral and tested around the sockets all of the readings were correct ie R1 + rn÷4. But when I tested with live earth cross conceded the readings got higher...
  14. M

    I Need Work looking for work in oxford or reading

    Hi all, I am electrician mate lives in oxford, looking for work either in oxford or reading MY CSCS card is out of date (ordered replacement)
  15. O

    Unusual Zs reading when testing circuit with RCBO

    Been testing a modified circuit today. Ze = o.20 R1 + R2 = 0.77 Zs = 1.77 So the reading is about 0.80 higher than I was expecting... Nothing on this (lighting) circuit switched on..... I was testing at the end of a smoke alarm addition. I've read elsewhere, that its a good idea to do a Zs on...
  16. S

    TT Ze reading- loop high or loop no trip?

    When measuring Ze on a TT that's RCD protected which is more accurate? Getting 27.1 on high current but 563 on no trip.
  17. T

    Newly Qualified to domestic level

    Hi am Tony newly qualified Domestic installer just thought i would say hello really.
  18. D

    high Zs readings

    Did an EICR in a domestic property, earthing arrangement was a TN-S with a Ze of 0.51 ohms. There are 2 ring final circuits protected by 32amp 60898 type B mcbs. Both circuits have additional protection from a 30mA RCD. My Zs readings for the circuits are 1.63 ohms and 1.89 ohms. My question...
  19. P

    TT High Zs

    Evening. Did a Zs test today on a TT lighting circuit and got a reading of 335ohms. I haven't checked Ze yet but I'm presuming that's also in the same ball park. I'm aware of the upper limit Zs of 1667 and the advice contained within the good book that states Zs should be below 200, so I'm in...
  20. N

    Water bond under carpet/furniture

    I am going to quote for a job (new circuit). Problem is the 10mm water bond is under the living room carpet/furniture as there is no stopcock in the house. I know it's within 600mm of the incoming water pIpe because I connected it there many years ago. I did a quick wander lead test from the...

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