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Thread: Testing and Verifying Grounding ?

  1. #1
    Join Date
    Jul 2008
    Location
    North Of Tampa Fl
    Posts
    415

    Testing and Verifying Grounding ?

    Our manufacturing plant was built in 1984 . We have about 150,000 sq ft of manufacturing area plus office space . The structure is metal columns bolted on concrete pads with concrete floors and concrete walls . The metal columns and bar joists are all welded and bolted together . We have quite a few areas with chemical containers which are bonded to the nearest building steel for static charge . Our safety department is inquiring about doing annual testing to verify the bonding and grounding in the plant . ( 1) What kind of testing would be recommended for the static grounds ? ( 2 ) As we have five services into the plant what would we want to do to verify the original grounds and the existing grounding in the plant ? I know we could get a ground tester and use a ohm meter for continuity but as this something we haven't done I want to be sure we use the correct approach to do this ...

  2. #2
    Join Date
    Feb 2005
    Location
    Charlotte, NC
    Posts
    6,709
    Low R ohmmeter for connections, 3 pt FOP test for your ground. Any testing company can do that for you and do it right.

  3. #3
    Join Date
    Jun 2017
    Location
    WI, USA
    Posts
    303
    You might review NFPA 70B for intervals. Annual visual inspect is more appropriate with actual testing ever few years. 70B,NETA and NECA will help with the method.

    http://www.nfpa.org/Codes-and-Standa...ds/Free-access

  4. #4
    Join Date
    Aug 2004
    Location
    Northern illinois
    Posts
    15,757
    do you want to test grounding or bonding?

    if so, what are your pass/fail criteria?

    the NEC criteria is essentially that the connection is made and that can be verified by a visual inspection.
    Bob

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