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insulation resistance

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  1. S

    Insulation resistance testing

    456megaohms on a 25m 3core swa is acceptable as its more than 1megaohms. Correct.
  2. HappyHippyDad

    Global Insulation resistance <1MΩ but individual circuits are all > 1MΩ

    With regards the title is the reason for this because the circuits are all in parallel? I am talking in relation to a L/N - E test. If Rt = global resistance for whole CU and R1, R2, R3 = L/N - E resistance for each circuit then am I right with the following: 1/Rt = 1/R1 + 1/R2 + 1/R3 So...
  3. P

    Low N/E insulation resistance

    Hi all, Just installed a brand new radial circuit for the upstairs sockets with Prysmian 2.5mm T+E, around 21 metres in length. When testing the insulation resistance of the circuit upon connection to the consumer unit, I seem to repeatedly get around 49 Megohms when measuring Neutral to Earth...
  4. D

    Quinetic controller ok with 500v insulation resistance test?

    Hello Everyone Hopefully the title is self explanatory. Or should I disconnect it for the test?
  5. R

    Insulation resistance check

    Hi - I have a Warm-up underfloor heating system. And it's stopped working. I did a basic resistance check - and clearly there's a problem (shows just 18ohms when it should be nearer 200). Warmup have said they can send an engineer around to lift a tile after doing a thermo heat check...
  6. E

    Insulation Resistance Results

    Hi, I’d like some clarification with regards to insulation resistance results I’ve got. Carrying out initial verification on a new ring final circuit. New cable, 9 new MK double sockets. r1 - 0.43 rn - 0.42 r2 - 0.68 R1+R2 - 0.28. Carried out insulation resistance test: L-N - >2000 MOhms L-E...
  7. T

    Insulation resistance test on length of SWA cable

    Doing new supplies for a school new Shneider 3 phase & N MCCB panel board. 50mm 4 core SWA one end made off in the board earth fly lead from banjo to earth terminal. The other end gland made off in gland (fly lead not made off yet) 3 phases and neutral just hanging there. Done installation...
  8. B

    Leakage meter usage/selection

    Hi. I have a question about earth leakage meter usage/selection. I see that people say one should test the live wires not the earth for reasons you guys probably understand. However earth leakage meters with large Jaws to loop around both tails are much more expensive. Can I use a combination...
  9. Tom Crabbe

    MINIUM INSULATION RESISTANCE READING

    Hello, has anyone noticed in the new GN3 that any reading below 20 Mohms now has to be investigated or is this a printing mistake as it used to be 2Mohms? Thank you Tom
  10. Bobby34

    Insulation Resistance testing method

    Good afternoon, apologies if this has been covered before i've not long joined so gradually finding my way around. I have my Part P assessment coming up on a new installation and would like to hear some opinions on how people carry out their IR tests. In guidance note 3 it gives an example of...
  11. J

    Insulation Resistance...

    I am just working through my understanding of the insulation resistance test, and I want to find out the best way to do the combined Live-Earth test where the Line and Neutral conductors are connected (joined, or however it is best described) through one probe of the tester, and the other probe...
  12. N

    insulation resistance test on shower circuit with neon isolater

    On a new install of a shower circuit, with a neon isolater, is it better to use choc blocks to bypass neon isolater or would it be ok to just test live-earth (live being neutral and live combined) and miss the live-live test? If testing just live-earth, would you write it down in details of...
  13. naylorpd

    Insulation resistance test issue

    Back in 2013 I had a Domestic Electrical Installation Condition Report done on my rented property - nothing horribly major but one thing I didn't understand... I had a C3 code for "0 ohms readings for I.R test for sockets & lighting (unable to remove all loads sockets, lighting had electronic...
  14. G

    Hello & Help with AM2

    Hi, This is my first post, although I have been browsing the forums for a little while now. I work in BMS and have my AM2 on friday. The nature of my work means I don't get to test so there are a few things I'm unsure of and was hoping for some clarification. I know for some people they may be...
  15. F

    Insulation resistance testing on eicrs

    Advice or quicker ways for doing i r tests on an eicr generally what I have been doing over the years is live to earth neutral to earth and joining live and neutral together then testing to earth job done but my pal who has recently had his annual nice i c visit said he's been shown a new...
  16. P

    rcd tripping during the night and insulation resistance testing question

    Hi everyone I have a customer who has a RCD that trips during the night and it resets ok the following day it is ok for a week or so then it tips again during the night. has any one any ideas and what is the quickest way of finding out what the cause is. also I need to do an insulation...
  17. T

    How to bypass an RCD and carry out an insulation resistance test on a circuit

    Hi all. I'm a 4th year electrician currently awaiting to finish my trade test. (FICA in Scotland) the only parts I have to pass is the testing part and fault finding. I'm currently studying testing as this is something I have done the minimum of onsite. Could someone tell me how I would...
  18. D

    insulation resistance question FICA

    Hi yesterday I sat my FICA test and during the insulation resistance test I’m not sure if I made a mistake I measured it doing individual circuits I had the main switch at db on but forgot to turn on the mcbs I measured between Line at MCB and earth and Neutral bar to MCB then neutral bar to...
  19. N

    Insulation resistance - strange readings

    Im getting some strange reading on a new circuit(ring main) ive installed and i was wondering if anyone else had experienced the following. insulation resistance at 500v on L-N is >500mQ (which is fine) then insulation resistance between N-E starts at 400 then climbs to 500mQ then insulation...
  20. S

    NO switch insulation resistance failure

    How often do we usually have insulation resistance failures on an NO switches leading to unexpected starts?

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