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Thread: Ground rod in disturbed back-fill

  1. #1
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    Ground rod in disturbed back-fill

    code says driven 8'.

    does this mean the rod has to be 8' in undisturbed soil?


    is it not code compliant to hydro-vac a hole 6' deep then drive the rod the last 4', then back-fill the hole?


    what is the best back-fill for this application?



    thanks

  2. #2
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    Quote Originally Posted by Wire-Smith View Post
    code says driven 8'.

    yes it does (mostly anyhow).

    does this mean the rod has to be 8' in undisturbed soil?

    it does not say that.


    is it not code compliant to hydro-vac a hole 6' deep then drive the rod the last 4', then back-fill the hole?

    it uses the word 'driven". IMO you can dig a hole and then fill it back in and drive the rod into the now filled hole.


    what is the best back-fill for this application?

    code does not specify and it really does not matter much anyway.

    thanks
    you're welcome.
    Bob

  3. #3
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    Quote Originally Posted by petersonra View Post
    you're welcome.

    what do you think about installing the rod before back-fill?

  4. #4
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    Quote Originally Posted by Wire-Smith View Post
    what do you think about installing the rod before back-fill?
    Well then it's not driven but really who would know?
    Rob

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    All responses based on the 2014 NEC unless otherwise noted

  5. #5
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    do you think crushed limestone would be good back-fill, or slightly corrosive?

  6. #6
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    Quote Originally Posted by Wire-Smith View Post
    do you think crushed limestone would be good back-fill, or slightly corrosive?
    i think there is no "best" backfill. it just does not matter all that much. put the dirt back in and pound the rods. you will probably need two of them 6 feet apart.
    Bob

  7. #7
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    I tend to agree with Bob, people seem to get all warm and fuzzy over ground rods even though they're not that great to begin with. I did have an inspector tell me that he pulls on the rod to see if it moves which could happen in very loose fill or if it's only 2' long.
    Rob

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    All responses based on the 2014 NEC unless otherwise noted

  8. #8
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    You could add Bentonite clay to the backfill. It retains moisture and so improves the effectiveness of the electrode.
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  9. #9
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    Quote Originally Posted by Tony S View Post
    You could add Bentonite clay to the backfill. It retains moisture and so improves the effectiveness of the electrode.
    I agree, bentonite is used with chemical ground rods.
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  10. #10
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    Quote Originally Posted by infinity View Post
    I tend to agree with Bob, people seem to get all warm and fuzzy over ground rods even though they're not that great to begin with. I did have an inspector tell me that he pulls on the rod to see if it moves which could happen in very loose fill or if it's only 2' long.
    I can recall many places where soil is sandy and you can nearly push a rod all the way in with bare hands.
    I live for today, I'm just a day behind.

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