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Discuss Insulation resistance testing on eicrs in the Periodic Inspection Reporting & Certification area at ElectrciansForums.co.uk.

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  1. Farmelectrics
    Offline

    Farmelectrics Farmelectrics Electrician's Arms

    Location:
    Wirral
    Business Name:
    Farm electrics
    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 method of doing it by his inspector using a low ohm clamp meter and applying ohms law bit confused and looking for advice if true how to do this and is it achievable
     
  2. Dillb
    Offline

    Dillb Electrician's Arms

    Location:
    Nottingham
    A IR test needs to be done at the relevant voltage as per BS7671, so trying to apply ohms law wont work. Be intresting to know what else the “assesor” doesnt know.
     
    • Funny Funny x 4
    • Agree Agree x 2
  3. Risteard
    Offline

    Risteard Electrician's Arms

    Location:
    Derry, Ireland
    Business Name:
    Walsh Electrical Services
    I presume he is trying to measure the Earth leakage. There is merit in this approach but BS7671 doesn't recognise it as an alternative.

    Out of curiosity the OP states that he measures phase to Earth and neutral to Earth, and then live conductors connected together to Earth. Why the first two tests and not just the live/Earth test? There could also be a risk of damage to equipment with a phase/Earth and neutral/Earth test which is mitigated by connecting the live conductors together.
     
    • Agree Agree x 2
  4. Farmelectrics
    Offline

    Farmelectrics Farmelectrics Electrician's Arms

    Location:
    Wirral
    Business Name:
    Farm electrics
    If I'm honest dill totally agree but my mate was adamant even though he didn't explain it well hence my confusion stick to my old ways though must admit the ir tests can be difficult when some of the 36 way boards are chocker and access to the neutral bars and earth bars are difficult with out stripping the whole board down
     
  5. westward10
    Offline

    westward10 In echoed steps I walk across an empty dream. Staff Member Moderator

    Location:
    Northamptonshire
    I have learnt over the years that assessors like to come armed with a piece of information they think will impress you and show what geniuses they are. I prefer to convince them otherwise.
     
    • Like Like x 6
    • Agree Agree x 1
  6. cliffed
    Offline

    cliffed Regular EF Member

    Location:
    Lancs
    I mentioned this to our gaffer ages ago,nothing ever came of it.
    I think it’s a good idea,especially in a big complex,when doing EICR testing,where disconnecting becomes a headache.
    Obviously on easier projects always the right way,is always the best way.concerninhg IR tests.
     
  7. Andy5678
    Offline

    Andy5678 Electrician's Arms

    Location:
    Scotland
    So can anyone explain the clamp method?
     
    • Agree Agree x 1
  8. Pete999
    Offline

    Pete999 Forum Mentor

    Location:
    Northampton
    Business Name:
    None
    Yes very well said Dillb
     
  9. spinlondon
    Online

    spinlondon Forum Mentor

    Location:
    Harlow Essex
    Testing Line to Earth then testing Neutral to Earth, is fine if you then test between Line and Neutral.
    Doing three tests to Earth is a waste of time, might just as well do a single test with Line and Neutral joined and test to Earth.
    If you’re worried about vulnerable equipment, and can’t be asked to identify, disconnect or link out, then you would do better testing between Line and Neutral at 250V.
     
    • Agree Agree x 1
    • Bad Spelling Bad Spelling x 1
  10. Pete999
    Offline

    Pete999 Forum Mentor

    Location:
    Northampton
    Business Name:
    None
    An even bigger question for me what is a low ohm clamp meter?
     
  11. spinlondon
    Online

    spinlondon Forum Mentor

    Location:
    Harlow Essex
    Bad spelling?
     
  12. Pete999
    Offline

    Pete999 Forum Mentor

    Location:
    Northampton
    Business Name:
    None
    Suggest that your Mate gets a detailed method statement from this NICEIC Bloke
     
    • Agree Agree x 1
    • Optimistic Optimistic x 1
  13. Wilko
    Offline

    Wilko Electrician's Arms

    Location:
    Berkshire
    Business Name:
    Wilko Electrics
    IR testing L-N with any loads connected is just pointless. Otherwise they wouldn't be loads ... or have I missed something?
     
  14. Farmelectrics
    Offline

    Farmelectrics Farmelectrics Electrician's Arms

    Location:
    Wirral
    Business Name:
    Farm electrics
    Think you missed something wilko live and neutral together and the test to earth
     
  15. Wilko
    Offline

    Wilko Electrician's Arms

    Location:
    Berkshire
    Business Name:
    Wilko Electrics
    Forum got the shakes :)
    Yes, I agree the (L+N) to E once there are connected loads. Commenting on post #9 really.
     
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