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insulation resistance

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  1. 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...
  2. 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...
  3. 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
  4. G

    rcd low insulation resistance

    do rcds give low readings when testing insulation resistance
  5. 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...
  6. 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...
  7. 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.
  8. 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...
  9. 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...
  10. R

    Insulation resistance test on a EICR/PIR

    insulation resistance test on a EICR/pir have read in 'unite the union guide to inspect and test' test carried out with L/N joined to Earth and no need to disconnect loads/vunerable devices pic1 to test whole insulation, shows link between L/N (incoming) at main switch with supply isolated...
  11. L

    Advice on insulation resistance test procedure :)

    Hi guys, I would just like to ask if any one could look at my test procedure off the top of my head and give any advice or pointers or whether its too long winded or short. got an exam in 2 weeks so trying to drill it in to this thick skull :) Many thanks Safe Isolation has been carried out...
  12. L

    Insulation resistance Live to Earth on lighting circuit dead short

    Hi all, Tested a lighting circuit recently and got live to earth dead short and neutral to earth dead short on insulation resistance all loads were still connected there was a fluorescent fitting on the circuit and signs of green goo in switches and ceiling roses and the MCB was not tripping. Do...
  13. A

    Insulation Resistance Testing Ring Circuit

    Hello All, I am to install some extra sockets for a customer on a relatively new build. The insulation resistance test. I tested at 250VDC between line conductors connected and earth and obtained a reading of 1.10 ohms (not megaohms) Does this reading seem likely that a piece of equipment...
  14. N

    Insulation Resistance - Live to Neutral short

    Hi all, Just a quickie. I carried out an insulation resistance test on a lighting circuit which only has two rooms consisting of 4 lights. Live to earth and neutral to earth was fine but when I tested live to neutral I got a short circuit. All the bulbs were removed so just wondering if...
  15. I

    3 phase insulation resistance

    Hi All first post I read that during the insulation resistance test of a 3 phase removal of the neutral incomer is necessary ! can some one please state the procedure for 3 phase IR tests Thanks
  16. D

    Insulation Resistance Testing Problems

    Been to a Job this morning problems with RCD tripping, Global IR came back 0.016, Split circuits down and lighting tested (Including outside tested 0.018) however tested again 0.567 and then 1.03 each time the figure increases until it sits about 1.14. Testing done L&N - cpc and then N-Cpc...
  17. B

    Insulation resistance testing with no cpc

    When doing a CU change and lights have no cpc. Every room has class 2 dimmers and lights. ceilings are like 20 foot tall. How would you guys go about Insulation testing? L&n to cpc ain't an option and removing all lights and bypassing dimmers is consequently going to take some time... What would...
  18. A

    Insulation Resistance

    Hi i`m new poster, qualified electrician but not working as one just using it for my home. I have installed an extractor fan with low voltage light in en-suite and now have to do a minor works tests. I have done the resistance test an my readings are l/n 0.8 l/e 1.7 n/e 1.3 earth fault loop...
  19. F

    Question about Insulation Resistance values

    Job is to extend a kitchen ring circuit, and have a question about Insulation Resistance values. Tests on existing ring (2.5/1.5 t&e) carried out and results as follows - Ring continuity (end to end) R1-R1 = .38W RN-RN = .42W R2-R2 = .64W Continuity W R1-R2 = .34W Insulation Resistance MW...
  20. M

    Insulation resistance on a live DC cable?

    Hi Was wondering if you could clear up a few things I on't quite understand, I've been told it is possible to do an insulation resistance test on a live DC cable (Solar pv) by testing to ground. Is this right, and what voltage rating should I set the megger to? Also on a domestic solar pv...

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