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Discuss New Member with an EICR question on max Ze reading in the New Member Introductions area at ElectrciansForums.co.uk.

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  1. Clarkie
    Offline

    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
    Offline

    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
    Offline

    Clarkie New EF Member

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

    Clarkie
     
  4. Midwest
    Offline

    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
    Offline

    buzzlightyear Regular EF Member

    Location:
    star command

    put is on here you
     
  6. Midwest
    Offline

    Midwest Electrician's Arms

    Location:
    Oxfordshire
    Did they do a Zs on final circuits?
     
  7. buzzlightyear
    Offline

    buzzlightyear Regular EF Member

    Location:
    star command
    can you upload test certs, saw we can have butchers at them .
     
  8. Murdoch
    Online

    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
    Offline

    Midwest Electrician's Arms

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

    PS Been on Summit Plummet yet Murdoch :)
     
  10. Clarkie
    Offline

    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
     
    • Bad Spelling Bad Spelling x 1
  11. Midwest
    Offline

    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.
     
    • Agree Agree x 1
  12. Rpa07
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    Rpa07 1000 posts only 44653 behind Telectrix! Electrician's Arms

    Location:
    Bristol
    Business Name:
    Ebenezer electrical
    Decimal point in wrong place and TNCS?
     
    • Winner Winner x 1
  13. Rpa07
    Offline

    Rpa07 1000 posts only 44653 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
    Offline

    Lou Admin Staff Member Top Contributor

    Location:
    Staffordshire
    Welcome :)
     
  15. Midwest
    Offline

    Midwest Electrician's Arms

    Location:
    Oxfordshire
    I think he's improving, his next post was nearly a full sentence.
     
    • Agree Agree x 1
    • Funny Funny x 1
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