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Question on Ground Resistance Testing Methods

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  1. michaellabeit is offline Junior Member Pro Subscriber
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    Question on Ground Resistance Testing Methods

    I've got a customer who needs their grounding electrodes tested for an inspection (8 electrodes total, in a 4x4 configuration). We do grounding resistance tests but typically for electrodes outside or for setting up mobile power plants, where there's plenty of room for lengthy fall-of-potential tests. The building where the electrodes are located is cramped (see picture). I'm assuming that they are all connected via a grounding grid underneath, but I will verify that once I head out there obviously. Any thoughts on the best method of testing these? Click image for larger version. 

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    Kalbi_Rob is offline Experienced Member
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    Quote Originally Posted by michaellabeit View Post
    I've got a customer who needs their grounding electrodes tested for an inspection (8 electrodes total, in a 4x4 configuration). We do grounding resistance tests but typically for electrodes outside or for setting up mobile power plants, where there's plenty of room for lengthy fall-of-potential tests. The building where the electrodes are located is cramped (see picture). I'm assuming that they are all connected via a grounding grid underneath, but I will verify that once I head out there obviously. Any thoughts on the best method of testing these? Click image for larger version. 

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ID:	495
    I would perform one of two test.
    First option: You can probably perform a fall-of-potential test thru the roll-up door on each ground rod.

    Second option: Perform fall-of-potential test on outside of building steel, then perform 2-point test to each ground rod.

    Or lastly you can perform a combination of the above, with a fall-of-potential to one ground rod, then 2-point to the other 2.

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