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  1. 1983
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    1983 Regular EF Member

    Hi all on a eicr insulation resistance test between live conductors to earth gn3 says join l & n and test to earth is there any difference between that and testing phase to earth then neutral to earth? As you guys know some boards are a right mess and not in order to locate which belongs to which
     
  2. Strima
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    Strima Electrician's Arms

    Location:
    St Neots
    The idea of linking L&N and testing to earth will allow you to do a global test quickly. If it passes on the global then all is good, if not then you need to break it down into circuits to find the culprit.
     
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  3. 1983
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    1983 Regular EF Member

    So would you say that testing l then n to earth is individual
     
  4. westward10
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    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    I rarely connect them together but the theory is if you do it may eliminate possible damage to sensitive electronic components.
     
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  5. Richard Burns
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    Richard Burns Trusted Advisor

    Location:
    Cambridgeshire
    Business Name:
    Richard Burns
    If you test L to E or N to E without disconnecting all loads then you apply 500V DC to the internal components of any load, in general this might be OK and will not cause harm however in some cases (such as smoke alarms, as they always say do not IR test)) the components may not be rated for that voltage and may fail.
    If you join L and N together then test to earth then there is no potential difference across the internal components.

    IR testing LN E or LE NE2.jpg
     
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  6. 1983
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    1983 Regular EF Member

    When I do testing in occupied houses most are in a mess all over the place trying to find which point belongs to which circuit is a headache so when it comes to testing I seem to always get funny readings coz of loads connected still so go round unpluging what not some u just can't seem to find
     
  7. 1983
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    1983 Regular EF Member

    I always go with 230 1st until I get good reading then the 5
     
  8. 1983
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    1983 Regular EF Member

    Sorry of topic but wanted to get your guys views on something an old boy sparks once told me tns system is better then pme would u agree
     
  9. westward10
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    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    There are pros and cons to both, TN-C-S can cause problems with the loss of neutral and on the reverse side many TN-S supplies are derived from older cables and can suffer from earth loss through degradation or network alterations.
     
  10. 1983
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    1983 Regular EF Member

    Thank you mate makes sense. Got another question for you if you don't mine was testing a ring only four points on it r1 0.11 rn 0.13 r2 0.70 can only access two points as the other to needs hours just moving to many things about checked the two sockets and ccu no lose connection
     
  11. westward10
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    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    Your R2 seems high in relation to the line continuity.
     
  12. 1983
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    1983 Regular EF Member

    That's what I mean so I got no choice but to check connections on the 2 remaining sockets which means moving a lot of stuff
     
  13. westward10
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    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    What needs moving just sheer junk or furniture.
     
  14. 1983
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    1983 Regular EF Member

    Junk on top of furniture on one side and massive walldrope on the other with more junk was thinking to just drop the mcb size to 20 amp
     
  15. westward10
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    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    Dropping it to 20A won't solve a possible earth continuity fault. As you are doing an EICR I would not be over concerned at finding the fault, Code it in the Report and if you are asked to do remedial works then advise the client access is required.
     
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  16. 1983
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    1983 Regular EF Member

    Westward I've been on this forum so many years I hardly post but read a lot of here and have to say u are one of the most helpful I've come across thank you mate appreciate your replies
     
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  17. westward10
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    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    Thanks for that much appreciated.
     
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  18. gazdkw82
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    gazdkw82 Trainee Trainee Access

    Location:
    leicester
    Going back to the IR question. You could do a global test and if the reading is too low then knock a circuit off 1 at a time until the reading improves. You can then hopefully have Better idea on what circuit is providing the low reading. Once you have narrowed that circuit(s) down you would need to test L to E, N to E. which ever one comes out low is your problem. At that point you will have to investigate more by inspection
     
  19. 1983
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    1983 Regular EF Member

    Thank you mate much appreciated
     
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