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insulation resistance

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  1. 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...
  2. 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
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. L

    Insulation resistance test on new circuit

    Iam currently on a new build project and I've been carrying out some IR test prior to everything being boarded up. The construction is all timber frames with celotex ply and plaster board, I have connected up the kitchen ring with connector blocks to carry out IR tests and I have been getting...
  9. D

    New RCD Consumer Unit - Insulation resistance

    When fitting a new RCD consumer unit, In your eyes guys what result in insulation resistance would cause problems with RCD's ?? Cheers Dave
  10. C

    Array insulation resistance

    Can anyone help me? I've got an annual inspection this week What's the procedure for carrying out an array insulation resistance with a Megger 1552? Many thanks
  11. N

    Insulation resistance testing

    Hi guys, I obviously know how to conduct a IR test but I'm just looking for a few tips, I was doing a lighting d\b today and obviously I never did a L-N test as it was a massive building and not feasible to disconnect all lamps. It was a triple pole +N mainswitch so I isolated the board, it is...
  12. S

    Insulation Resistance Testing : Can someone proofread the below for me please ?

    Title says it all really. I've just qualified and unfortunately my college bombed through IR testing but before I even touch anything I want to make sure I understand it thoroughly. Can anyone please compare what I've copied and pasted below to the diagrams and made sure I've understood it...
  13. I

    Insulation resistance low voltage lighting

    I have recently qualified and am coming towards testing a re-wire. I have fitted 30 low voltage downlighters with transformers. Apart from removing the bulbs do I need to do anything else before pumping 500volts through the circuits. ie will 500volts damage the transformers or are they removed...
  14. R

    3 Phase Motor - Insulation Resistance Testing

    Hi all, Could someone please help with a query I have? At a factory I work in, we get a lot of damaged motors (due to it being a very wet environment), they are only quite small normally, varying around the 0.25-0.37kW size. Normally when I test them, I remove everything so I am left with the...
  15. S

    Insulation Resistance - Forgot

    When I was at college our tutor told us a way of doing ins res testing to ensure that downstream devices that are still plugged in are protected from the 500v voltage applied. For the life of me I have forgot what he said. Can a nice chap fill me in? Thanks guys.
  16. i=p/u

    insulation resistance testing stanless steel

    in a cafe at present working and is a load of stainless steel in one corner for washing up etc.. i want to do a test to see if needs bonding im nearly certain i I r test from earth isco to stainless steel in question and test @ 500vdc and if under 22k ohms it should be bonded, is this info...
  17. L

    Insulation resistance test on a whole consumer unit?HELP

    Can any one explain to me the correct method to test insulation resistance on a 3 phase consumer unit all at once as apposed to testing each final circuit individually? Especialy circuits vulnerable to test voltage. GN3 states that you connect line and neutral together and test to eath is that...
  18. C

    Insulation Resistance testing - again!

    Hi Getting used to Metrel tester and am getting used to testing and was just after advice on clarifying some points: 1 - FCU's with neon indicators on IR tests - whats the best way of disconnecting the neon lights on these if they cant be disconnected? Do I keep that particular FCU switched...
  19. P

    insulation resistance testing question

    If some of the circuits of a shower block for a big site have been tested for insulation resistance during constuction. what is the possible effect that insulation resistance testing the whole installation when completed have on values obtain on completion compared with for those circuits when...
  20. C

    250v Insulation Resistance test - Lots of D/lights

    I know when a 250v insulation resistance test can and cant be done. But when it says that a 250v is ok when its impractical - what is the definition of impractical? Ie for this scenario: How many downlights would be deemed as impractical to remove (as they are buggers sometimes to remove...

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