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insulation resistance

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  1. HappyHippyDad

    Does anyone have a list of expected Insulation Resistance test results?

    I would like to get a better understanding of what the specific IR test results could indicate. I'm talking more about the below 1MΩ area. I'm talking about.. wet plaster, flooding (sitting in water), degraded insulation etc etc, I realise it wouldn't give the answer but it may help in narrowing...
  2. D

    Newbie Insulation Resistance question

    Hi all hope everyone's had good weekend. I am currently studying for 2394/5 and and getting used to testers/testing by doing abit around the house. Where the insulation test is concerned i still have a few questions. I have a 2 way lighting circuit in living room and although i know that i...
  3. B

    Poor Insulation resistance?

    I am currently Insulation testing a new install and all circuits have been greater that 299 meg ohms apart from 2 circuits where I get greater than 30.6 meg. On a new install surely this is not correct. Nothing is plugged in and no electronics are on the circuit. Both circuits are socket...
  4. R

    Insulation Resistance Test for FICA

    Hi guys sorry for posting as I know there is a lot of posts similar to this. my problem Is for my trade test I am a little confused about insulation resistance test. I know most of it for example lock off at main switch remove all sensitive equipment test between live-neutral live-earth...
  5. M

    insulation resistance on a domestic ring circuit

    how would you calculate the insulation resistance on domestic ring circuit when measuring with both live and neutral conductors connected together to the circuit protective conductor, is there any way of calculating the approximate value before using a insulation resistance instrument. cheers
  6. B

    three phase motor insulation resistance test

    Hi all wondering if you could help clear something up for me. I was recently working on a three phase motor rated for 480volts a.c and wired in delta. So before powering up I done my dead testing and done my insulation resistance test at 500volts d.c which I thought was correct but read up on it...
  7. B

    insulation resistance

    I'm fed up of having to disconnect all conductors out of the rcbo's to obtain an insulation resistance test, does anyone having a better solution to bypass this to make life easier.
  8. A

    Most accurate Insulation Resistance tester out there?

    I'm just wondering is there a really accurate IR tester on the market many thanks
  9. R

    Insulation Resistance test in FICA

    hi there I have my FICA in a couple months time and generally feel pretty confident but not too sure about the insulation resistance. I know how to test it just not sure of what precautions to take and how many tests need done? also how many times do I need to flick the light switches so that I...
  10. S

    Insulation resistance test

    Hi. Has anyone had a problem with a Megger MFT1552 with regards to insulation resistance testing? All if a sudden mine won't work & displays 500mA. I've tried a couple of new fuses but still nothing. Everything else works fine....
  11. Majid Khan

    Insulation resistance testing

    Hi guys, Could anyone help me Please with the following questions? I have an assignment to do which has a question that states, Insulation resistance testing has been carried out on the installation and the following result obtained: Live to Live = 195 M ohms Live to earth = 0.75 M ohms...
  12. TheSilverSpider

    Low Insulation Resistance reading of 0.63 MOhms , what does this indicate?

    on a ring testing Insulation Resistance L-N shows 0.63 Mohms but L-E is ok. I checked with the home owner that nothing was switch on, nor plugged in still.( its a 3 bed semi, looked every nook and cranny) Is that kind of reading tell tail of anything causing that in particular, or is it a case...
  13. R

    Insulation resistance

    Getting really low insulation res. readings from my D.B. Neutral bar to Earth bar 0.35 M.O Line & Neutral to earth 0.35 M.O So strange, R.C.D. DOES NOT TRIP! Have tried removing main earth and this makes no difference If any 1 could shed any light be great Cheers.
  14. Gazthesparky

    Global Insulation resistance testing

    I was doing a fuse board update the other day and normally I use duel RCD boards with mcb s but instead I used separate Rcbos due to the customer specifying these. I prefer fitting Rcbos due to just that one circuit is disrupted when there is a fault. when quoting for the job I carry out a...
  15. J

    low insulation resistance reading

    Hi, So I did and insulation resistance test on a lighting circuit today. L-N 0.23 L-E 34.9 N-E 35.8 The L-N is under the required reading, what do I do? Do I turn it off completely or advice the customer to get it re wired and leave it on???? Cheers
  16. K

    Mineral wiring insulation resistance test failed, need certification!

    My house, built in 1960, has mineral insulated cabling and a voltage operated earth leakage circuit breaker. We moved in 7 years ago (don't suppose that is relevant though :) ) Due to some rebuilding work the meter needs to be moved, and in preparation for that my electrician has fitted a new...
  17. B

    Insulation Resistance Testing - necessary ?

    Recently my boss and I were changing a fuse board(old to new). It was a shared house and some of the tenants were out at work and their doors locked. Not knowing what they had plugged in, in their rooms we skipped the Insulation Resistance test. Everything else was tested fine. My question to...
  18. N

    Completing MWC for Insulation resistance

    Hi Could anyone please advise how they would complete a MWC if they have tested L/N to E when carrying out insulation resistance test? What should you enter in the boxes provided on the cert? Many thanks
  19. S

    Insulation Resistance on new ring.

    We've installed a new ring - ring continuity was fine but Insulation resistance while well outside the limits was 50-60 M ohms.Obviously as a new circuit it should be perfect. Took it in half - both halves still at 50-60 M ohms, then again still the same. Thinking we might have a dodgy roll of...
  20. S

    Insulation resistance testing

    Hi all ran a ring circuit for someone about 6 months ago and when I carried out the insulation test my results were around 250 m ohms for l-n and slightly lower for l-e, anyway didn't think anything of it as we had just plastered all the rooms where the ring circuit went. Returned to the same...

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