insulation resistance

  1. C

    TL Inverters DC Insulation Resistance problems

    Having followed the Power One TL inverter thread I thought I would start a thread covering TL inverters in general. We have had 2 SMA 4000TL inverters DC Insulation Resistance problems reported this week. One we were out at yesterday and found it was possible to trick the inverter into working...
    • confounded
    • Thread
    • insulation insulation resistance inverters problems resistance
    • Replies: 8
    • Forum: Green Lounge (Access Only)
  2. 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...
    • Majid Khan
    • Thread
    • acceptable answer insulation insulation resistance insulation resistance testing question questions resistance testing these
    • Replies: 23
    • Forum: UK Electrical Forum
  3. 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...
  4. 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.
  5. 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...
  6. 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
    • jpaul
    • Thread
    • insulation insulation resistance reading resistance
    • Replies: 0
    • Forum: UK Electrical Forum
  7. 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...
    • Krispy
    • Thread
    • becsa certification circuit circuits competent cps failed insulation insulation resistance insulation resistance test led person resistance scheme test testing wiring
    • Replies: 24
    • Forum: UK Electrical Forum
  8. 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...
  9. 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
  10. 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...
  11. 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...
  12. S

    Insulation Resistance - I.T. Equipment

    Hi, ive just received my copy of COP4th Edition. It says that insualtion resistance test 500V dc might harm I.T. equipment and to use alternative method. I am using Martindale EasyPat 2100 which cant do 250V dc. Can anyone recommend a portable test instrument for the alternative test methods...
  13. I

    insulation resistance explained

    can someone please explain insulation resistance testing to me i have read GN3 and brian scaddans book , i know it is to ensure conductor insullation has not deteriorated or damaged but i read posts on here about how you can use it to find borrowed neutrals and short circuits , and why does...
  14. F

    insulation resistance reading

    I have borrowed a multifunctional tester it's calibrated and works everything's good with it. I did a live to earth test and got a reading of .078 megaohms what does this translate too it is not my meter and I don't really do testing too much
    • fugzyx
    • Thread
    • insulation insulation resistance reading resistance
    • Replies: 10
    • Forum: UK Electrical Forum
  15. G

    rcd low insulation resistance

    do rcds give low readings when testing insulation resistance
  16. S

    Multi Function Tester with low battery giving very low insulation resistance reading.

    I have a Metrel MI3000 MFT. It has given very low insulation resistance readings for a circuit I was testing earlier today (0.001MΩ) between live and earth(!) but the circuit has been working fine and not tripping the MCB (20A, no RCD as it is a pre-17th ed. CU) and I had tested it only a...
  17. S

    Insulation Resistance - is driving me nuts.

    Hello Sparkies and Sparkettes. Carrying out a IR tests I got a reading from the upstaris light (1.1 ohms) but could not get a reading of the downstairs lights, even though all bulbs were out and switches off. I could get no other reading from the other MCB's either e,g Ring, Shower, Cooker etc...
  18. N

    Question regarding Insulation resistance test.

    Hi I am still training and have a question regarding Insulation resistance test. My question is when doing the test between live and earth at the consumer unit, what happens to the circuit breakers? On or OFF? Many thanks.
  19. N

    Insulation Resistance Test For Minor Works

    Hi guys, Fairly recently qualified sparky here starting to do small solo jobs. I'm interested in views on insulation resistance testing on works to be signed off with a Minor Works Certificate. (Sorry this is a long post but I wanted to cover everything.) One view on this is that you only test...
    • NickD
    • Thread
    • circuit connected electrical work equipment installation insulation insulation resistance insulation resistance test minor resistance test voltage works
    • Replies: 13
    • Forum: Periodic Inspection Reporting & Certification
  20. C

    Insulation resistance fault on two way switch.

    Evening all. Thought I would finally seek advice of those who know better! This is my first post so be gentle with me! Just wired a new 3 bed house. All great until I test for ins. res. on final lighting circuit. Result came in at less than 1Mohm- [ L-E = 0.39, LN-E = same ] did all the usual...
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