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Discuss Megger kept tripping RCBO in the Electrical Forum area at ElectrciansForums.co.uk.

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  1. chris day
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    chris day Regular EF Member

    Location:
    london
    Business Name:
    Chris peter
    hello guys
    My megger kept tripping out a Wylex 10a RCBO today, the circuit i just installed and polarity had been checked at evey point i don't understand what the problem could be? I obviously set the meter to no trip
     
  2. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    i assume you were diong loop tests. did you connect all 3 leads in the right order.?


    I'm playing all the right notes, but not necessarily in the right order. Eric Morecambe
     
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  3. chris day
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    chris day Regular EF Member

    Location:
    london
    Business Name:
    Chris peter
    The tester has a 2lead low test, I also carried out the three lead Low test and the same issue
     
  4. Murdoch
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    Murdoch Electrician's Arms

    Location:
    Woking
    Can you try it on another RCD or rcbo?
     
  5. chris day
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    chris day Regular EF Member

    Location:
    london
    Business Name:
    Chris peter
    Yes and it worked fine on a different RCBO
     
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  6. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    if doing the test with loads connected, could be that there is some leakage on the circuit and the 15mA that the megger puts into the test takes it over the RCBO's threshold.
     
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  7. Billythekid
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    Billythekid Regular EF Member

    What type is the RCBO?
    Have you performed an RCD test to the RCBO - if so, what were the results?
     
  8. chris day
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    chris day Regular EF Member

    Location:
    london
    Business Name:
    Chris peter
    Hmm good point, a ramp test maybe would be good?
     
  9. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    hit it with a hammer.it should not trip below 30 ft.lbs.
     
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  10. Murdoch
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    Murdoch Electrician's Arms

    Location:
    Woking
    I would be double checking the ir on the new circuit .....
     
  11. Billythekid
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    Billythekid Regular EF Member

    Most test kits are designed to saturate the sensing coil with DC, if you have a type of RCBO that is designed to trip Under these circumstances then that’ll be the issue.
     
  12. chris day
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    chris day Regular EF Member

    Location:
    london
    Business Name:
    Chris peter
    To be honest it got to 6pm this evening and I will be going to tomor
    Hmm yes I am going back tomorrow to Finnish up so will do
     
  13. ipf
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    ipf Trusted Advisor

    No...but the contacts will still break.....
     
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  14. Billythekid
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    Billythekid Regular EF Member

    Please see photo, FYI

    5006D52A-2E48-45A8-8376-CE3CB340EA4A.jpeg
     
  15. KEV 1 N
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    KEV 1 N Regular EF Member

    Location:
    Durham
    I've had bother with wylex rcbos tripping on loop tests before, I remember now the only way it stayed on for the test to work was to remove all load from the circuit. I've carried out loop tests before on other makes of rcbos with load on and they don't trip.
     
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  16. Murdoch
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    Murdoch Electrician's Arms

    Location:
    Woking
    Always the best way of doing it!:)
     
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  17. KEV 1 N
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    KEV 1 N Regular EF Member

    Location:
    Durham
    I know, but not always possible when doing EICRs or if you happen to miss unplugging an item during the inspection.
     
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