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  1. Clarkie
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    Clarkie New EF Member

    Location:
    North West
    Afternoon Ladies & Gents,

    I'm a new member to the forum so thought I'd introduce myself.
    Been qualified for around 10 years and have finally set up on my own. I am new to the test and inspection side of things so I am seeking advise on the following question. Any help would be greatly appreciated.

    A friend of my misses is buying her first property and the seller has had a EICR completed. Now the question is that the installation is recorded as a TN-S with a Ze of 2.1 ohms.

    My understanding is that the Ze for a TN-S is 0.8 ohms. Am I missing something or is this reading excessively high?

    Any help/advice appreciated

    Regards

    Clarkie
     
  2. Midwest
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    Midwest Electrician's Arms

    Location:
    Oxfordshire
    The EICR chaps will be along shortly, in the meantime you are correct that the Ze for a TN-S system is around the 0.8 figure, although in may be higher in rural areas.

    Perhaps the home owner should ask the DNO for advice on this matter. They may say it is what it is, and are not obliged to improve it. What did the EICR suggest?
     
  3. Clarkie
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    Clarkie New EF Member

    Location:
    North West
    Hi
    The EICR made no other comment or recommendations on this point

    Clarkie
     
  4. Midwest
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    Midwest Electrician's Arms

    Location:
    Oxfordshire
    As said you could speak to the DNO, they may be able to improve things, conversion to TNC-S might be an option.
     
  5. buzzlightyear
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    buzzlightyear Electrician's Arms

    Location:
    star command

    put is on here you
     
  6. Midwest
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    Midwest Electrician's Arms

    Location:
    Oxfordshire
    Did they do a Zs on final circuits?
     
  7. buzzlightyear
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    buzzlightyear Electrician's Arms

    Location:
    star command
    can you upload test certs, saw we can have butchers at them .
     
  8. Murdoch
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    Murdoch Electrician's Arms

    Location:
    Woking
    This is an interesting question no doubt..... The EICR forms allow you to comment on the incoming service supply but they are technically outside the scope of the EICR.

    I would have commented.

    Such a high Ze would mean all 20a and above circuits would exceed their max Zs so there must be RCD's installed.

    Calling the DNO may result in them not doing anything.....
     
  9. Midwest
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    Midwest Electrician's Arms

    Location:
    Oxfordshire
    No harm in trying though........

    PS Been on Summit Plummet yet Murdoch :)
     
  10. Clarkie
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    Clarkie New EF Member

    Location:
    North West
    Will upload the EICR later on, but in answer to Midwest yes they did a Zs on both final rings with the same reading of 0.39 ohms
     
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  11. Midwest
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    Midwest Electrician's Arms

    Location:
    Oxfordshire
    The property must have some chunky metal service pipes in, or the Ze is incorrect. What do ya think EICR warriors?

    Have you considered contacting the DNO and asking them, they won't bite and usually will come and have a butchers for free.
     
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  12. Rpa07
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    Rpa07 2000 posts - only 46379 behind Telectrix! Electrician's Arms

    Location:
    Bristol
    Business Name:
    Ebenezer electrical
    Decimal point in wrong place and TNCS?
     
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  13. Rpa07
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    Rpa07 2000 posts - only 46379 behind Telectrix! Electrician's Arms

    Location:
    Bristol
    Business Name:
    Ebenezer electrical
    5 random words put together Buzz - nearly made sense!
     
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  14. Lou
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    Lou Admin Staff Member Top Contributor

    Location:
    Staffordshire
    Welcome :)
     
  15. Midwest
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    Midwest Electrician's Arms

    Location:
    Oxfordshire
    I think he's improving, his next post was nearly a full sentence.
     
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  16. westward10
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    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    Assuming the Ze was measured with the main protective bonds disconnected that is far too high and with those Zs readings it sounds like it is being earthed by other means.
     
  17. telectrix
    Online

    telectrix Scouser and Proud of It Trusted Advisor

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    or the Ze is 0.21 after the tester went to specsavers. i.ve frequently come across TN-S at well under o.8. at home it's 0.18.
     
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  18. widdler
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    widdler Trusted Advisor

    Location:
    North East
    Something in the information does seem a little strange. If the supply EFLI is that much though then as stated on the Condition Report guidance for recipients:

    But naturally, it is up to the skilled person to identify the inadequacy and provide accurate information for the person ordering the report to actually report it.

    But I very much doubt those readings are accurate.
     
  19. Midwest
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    Midwest Electrician's Arms

    Location:
    Oxfordshire
    too slow
     
  20. telectrix
    Online

    telectrix Scouser and Proud of It Trusted Advisor

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    only just got in after an investigation into paul's post regarding his security lights.
     
  21. westward10
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    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    And the outcome.
     
  22. telectrix
    Online

    telectrix Scouser and Proud of It Trusted Advisor

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    first fault is a cross connection between the upstairs socker rfc and the disused immersion heater radial, so the upstairs sockets get fed from 2 separate MCBs. this I will need to trace out after moving loads of itchy-poo.

    2nd fault is the diabolical installation of the security lights. cpc's sleeved and used as switched L's on 3 cables. metal floodlights not earthed. no RCD protection on installation. I have disconnected for obvious reasons. Paul has requested a quote to rewire the security lights with new LED floods and PIRs, and to sort out the X-connection.
     
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  23. Midwest
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    Midwest Electrician's Arms

    Location:
    Oxfordshire
    Arrr, lofts, love em.
     
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  24. Midwest
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    Midwest Electrician's Arms

    Location:
    Oxfordshire
    The next loft space I go up into, that's got more stuff than Big Yellow Self Storage, I'm going to take a picture and start a new thread.
     
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  25. westward10
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    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    Might start calling you Lofty.
     
  26. telectrix
    Online

    telectrix Scouser and Proud of It Trusted Advisor

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    as in.......

    upload_2017-7-13_15-41-18.jpeg
     
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  27. Midwest
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    Midwest Electrician's Arms

    Location:
    Oxfordshire
    • Like Like x 1
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  28. Murdoch
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    Murdoch Electrician's Arms

    Location:
    Woking
    No ... At universal today, in a Harry potter queue....
     
  29. Midwest
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    Midwest Electrician's Arms

    Location:
    Oxfordshire
    Coolio, we thought Universal, was the best back in 2001! You still find time to post, hope her indoors ain't watching you :)
     
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  30. marc_v33
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    marc_v33 Electrician's Arms

    Location:
    Glasgow
    What has been noted for Prospective fault current? Possibly just been put in the wrong box?
     
  31. stantheman
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    stantheman Regular EF Member

    To the op, have you quoted the dno's maximum typical value of 0.8Ω for tn-s or is that a measured value?
     
  32. Baker1988
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    Baker1988 Electrician's Arms

    Location:
    Kingston Upon Hull
    Can't you go and do a Ze your self as it might be that they just measured or wrote down incorrectly. As stated in a previous post what is wrote down for the prospective fault current?
     
  33. Madocks
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    Madocks Active EF Member

    Location:
    Pontypridd
    Welcome to the forum :D
     
  34. Madocks
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    Madocks Active EF Member

    Location:
    Pontypridd
    Welcome to the forum :D
     
  35. buzzlightyear
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    buzzlightyear Electrician's Arms

    Location:
    star command
    upload_2017-7-15_12-18-59.png lovely boy!
     
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  36. johnduffell
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    johnduffell Active EF Member

    Location:
    uk
    Strange to not comment on it, but if all circuits have rcd protection, is that reading even a problem? Although if I measured that value then I'd still get the dno out for an unreliable earth, in case it gets worse.
     
  37. Wilko
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    Wilko Electrician's Arms

    Location:
    Berkshire
    Business Name:
    Wilko Electrics
    Hi - the 2 Ohms may be ok if the installation is designed for that, as you would for a TT. But in summary - ask owner to call DNO and request a safety inspection (free) as they've been told by an Electrician that it may be unsafe. My concern is it may indicate a deteriorating condition and Client could end up with no earth. Apologies to all who've already said this on the thread, or if you've already established it's 0.2 Ohms :rolleyes: . Must have coffee ...
     
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  38. telectrix
    Online

    telectrix Scouser and Proud of It Trusted Advisor

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    yeah, a bit early for beer. just add a splash of scotch to the coffee.
     
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