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Thread: Underground Mine Grounding

  1. #1
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    Underground Mine Grounding

    Hi all, is anyone here familiar with grounding for an underground mine? I'm pretty sure the standard procedure is have your ground grid on the surface and run ground conductors down the shaft... but I was wondering has anyone put rods or plates actually down in the mine?

    Thanks

  2. #2
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    I do a good bit of work in a limestone mine. We once had to run power to a previously unused area. We had them use their bolt drill to drill holes in the rock. We then put in ground rods with the holes stuffed full with brass and copper shavings that another customer let us have. Most of the work just gets checked during their regular MSHA visits, but the area AHJ wanted to look at this one and passed it.

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    Yo Iggy! Calling you here!
    "Electricity is really just organized lightning." George Carlin


    Derek

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    I didn't know rock was conductive.
    Code references based on 2005 NEC
    Larry B. Fine
    Master Electrician
    Electrical Contractor
    Richmond, VA

  5. #5
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    Quote Originally Posted by LarryFine View Post
    I didn't know rock was conductive.
    Haha, yeah maybe that’s the answer right there. That being said, I have had some luck with boring holes in bedrock and using that ground enhancement material.

  6. #6
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    Quote Originally Posted by jumper View Post
    Yo Iggy! Calling you here!
    This should be right up his alley!!!

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    Quote Originally Posted by Cow View Post
    This should be right up his alley!!!
    Tailor made.
    "Electricity is really just organized lightning." George Carlin


    Derek

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    From what i understand MSHA is like OSHA on steroids....~RJ~

  9. #9
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    OSHA is Ordinary SHA, and MSHA is Mega SHA.
    Code references based on 2005 NEC
    Larry B. Fine
    Master Electrician
    Electrical Contractor
    Richmond, VA

  10. #10
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    Quote Originally Posted by romex jockey View Post
    From what i understand MSHA is like OSHA on steroids....~RJ~
    You'd be surprised what you can get away with electrically though. Rubber cords are the rule not the exception and they are strung out everywhere.
    If you don't think too good, don't think too much.

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