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Thread: HOW FREQUENTLY GROUNDING RESISTANCE NEEDS TO BE INSPECTED ??

  1. #101
    Join Date
    Dec 2003
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    1
    Quote Originally Posted by Anwar Pasha View Post
    Is there a Code or standard that stipulates a time period, within which the testing of Earth Resistance for an installation must be carried out to see whether the earthing system is working or not??
    You may find some information related to US Govt standard AFI 32-1065. Find on whole building design guide - www.wbdg.org. This is an Air Force instruction manual which has schedules of testing and types of testing recommended.

  2. #102
    Join Date
    Jan 2016
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    PA
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    we have Cu rod ground beds >50 yrs old
    they are tested twice a year
    initially they must be <4 Ohm, typically they are lower
    after a year or two they 'settle in' and usually decrease 10-20%
    consistent after that

    in over 50 locations we have never had one that intially met spec subsequently exceed spec during the biannual testing
    The difference between genius and stupidity is that genius has its limits.

  3. #103
    Join Date
    Oct 2007
    Location
    New Jersey
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    5,833
    Quote Originally Posted by Ingenieur View Post
    we have Cu rod ground beds >50 yrs old
    they are tested twice a year
    initially they must be <4 Ohm, typically they are lower
    after a year or two they 'settle in' and usually decrease 10-20%
    consistent after that

    in over 50 locations we have never had one that intially met spec subsequently exceed spec during the biannual testing
    What is the source of the testing requirement? Insurance company? Industry standard? Internal standard?

  4. #104
    Join Date
    Feb 2018
    Location
    Iowa
    Posts
    257
    Quote Originally Posted by gadfly56 View Post
    What is the source of the testing requirement? Insurance company? Industry standard? Internal standard?
    Usually the driving force is money. Money? Down time cost. If your Plant is down it is costing you money.

  5. #105
    Join Date
    Jan 2016
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    PA
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    Quote Originally Posted by gadfly56 View Post
    What is the source of the testing requirement? Insurance company? Industry standard? Internal standard?
    required by law

    each of the >50 locations has 2 beds
    so over 100 total
    The difference between genius and stupidity is that genius has its limits.

  6. #106
    Join Date
    May 2003
    Location
    Leesburg, VA
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    7,072
    Quote Originally Posted by Ingenieur View Post
    required by law

    each of the >50 locations has 2 beds
    so over 100 total
    MOSHA?
    Brian John
    Leesburg, VA

  7. #107
    Join Date
    Jan 2016
    Location
    PA
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    5,701
    Quote Originally Posted by brian john View Post
    MOSHA?
    Federal MSHA and our state bureau mining law
    The difference between genius and stupidity is that genius has its limits.

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