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  1. Tony Ryan
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    Tony Ryan EF Member

    Location:
    Liverpool
    Business Name:
    Ar Electrical
    Hi am Tony newly qualified Domestic installer just thought i would say hello really.
     
  2. Pete999
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    Pete999 Trusted Advisor

    Top Poster Of Month

    Location:
    Northampton
    Welcome
     
  3. Wilko
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    Wilko Electrician's Arms

    Location:
    Berkshire
    Business Name:
    Wilko Electrics
    Welcome to the forum Tony :)
     
  4. Vortigern
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    Vortigern Electrician's Arms

    Location:
    England
    Business Name:
    F.H. Electrical
    Hi Tony best of luck with your work.
     
  5. SparkyChick
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    SparkyChick Making a banana smoothy for my fave gorilla Electrician's Arms

    Location:
    South Wales
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    SparkyChick
    Welcome to the forums :)
     
  6. buzzlightyear
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    buzzlightyear Electrician's Arms

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    star command
  7. Tony Ryan
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    Tony Ryan EF Member

    Location:
    Liverpool
    Business Name:
    Ar Electrical
    A Question i have newly installed a Radial citcuit for a shower i have used a 10mm t&E cable about a 20 metre run when completing the continuity test of cpc i a m receiving a 0.21 Ohms reading the metrel tester i am using is showing up a red X on the display screen any ideas ?
     
  8. SparkyChick
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    SparkyChick Making a banana smoothy for my fave gorilla Electrician's Arms

    Location:
    South Wales
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    SparkyChick
    I would say that's a bit high. Based on the figures in GN3 for resistance of a 4mm core (I'm assuming it's a 4mm cpc), I get around 0.09 (4.61mOhms/m x 20). As for the red X, never used a Metrel, time for the user manual I think.
     
  9. Tony Ryan
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    Tony Ryan EF Member

    Location:
    Liverpool
    Business Name:
    Ar Electrical
    Thanks for the info sparkychic will re-doing the cpc check again just seems very strange to receive a reading like that hopefully will get a diff outcome later on.
     
  10. Andy78
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    Andy78 Trusted Advisor

    Location:
    Kingston upon Hull
    Is this a test of R2 or R1+R2 ? tabulated values for R1+R2 for 10mm/4mm t&e should be about 0.13 at 20m.
    High resistance connections, anomolies in test leads, low batteries in tester etc could all be contributing to a high reading.
     
  11. davesparks
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    davesparks Trusted Advisor

    Location:
    guildford
    First check the manual to find out what the red X means, you should reject the measurement until you have got past this potential issue with the equipment.
    Have you nulled the leads correctly? Did you have good contact pressure on the probes?
    Did you consider the accuracy of the tester?
    Are the batteries in the tester fresh?
     
  12. Tony Ryan
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    Tony Ryan EF Member

    Location:
    Liverpool
    Business Name:
    Ar Electrical
    Have looked at the metre still having issues with the red x on display it is a test of r1+r2 charged up batteries this morn still having issues tho.
     
  13. Murdoch
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    Murdoch Electrician's Arms

    Location:
    Woking
    Which Metrel model do you have?
     
  14. SparkyChick
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    SparkyChick Making a banana smoothy for my fave gorilla Electrician's Arms

    Location:
    South Wales
    Business Name:
    SparkyChick
    Well in that case, if it's R1+R2 for a 10/4 T+E, it's 6.44mOhms/m according to GN3 and you should be expecting something in the region of 0.13ohms.

    Having just had a quick skim of a Metrel manual (for the EuroTestXC), a big red X implies the test results are outside of a configured acceptable range. If it's 'Cal X', then the lead resistance hasn't been compensated for.
     
  15. terry1969
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    terry1969 Regular EF Member

    did you null the leads
     
  16. westward10
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    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    Deleted.
     
  17. Tony Ryan
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    Tony Ryan EF Member

    Location:
    Liverpool
    Business Name:
    Ar Electrical
    Need to spk with someone i re did the shower r1 r2 test got 0.01 ohms to begin with and got a green X then trying it again i jave gone straight bk to a red X wracking my brains on this one very strange have nulled the leads but getting very mad results lol
     
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  18. Midwest
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    Midwest Electrician's Arms

    Location:
    Oxfordshire
    As been advised, check connections, check batteries. Unless the testers u/s, you should get the same (or very similar) test results.

    Plus not knowing the meter (but think I understand the concept), 0.01 ohms gets a green X pass but the readings too low and 0.21 ohms gets a red X, fail on both counts. :)
     
  19. hightower
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    hightower Electrician's Arms

    Location:
    Durham
    With metrel you can set a fail level for continuity. On mine it's default is 2 ohms. Often get a red X when testing continuity of long lighting runs but that's just because I can't be bothered to adjust the limit. I don't look at the X, it's meaningless so long as you know what figures you should be looking for
     
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