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Thread: Cell tower grounding

  1. #11
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    Quote Originally Posted by Sahib View Post
    Whether it is footer or rod, it helps in easier dissipation of lightning current in association with the earth ring.

    The tower footers were 10' across and 28 feet in the ground concrete and rebar, if you are attempting to create a good electrode it is hard to beat that.
    Last edited by brian john; 12-24-17 at 10:01 PM.
    Brian John
    Leesburg, VA

  2. #12
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    Quote Originally Posted by brian john View Post
    The tower footers were 10' across and 28 feet in the ground concrete and rebar, if you are attempting to create a good electrode it is hard to beat that.
    Yes but if there is any electrical discontinuity in the arrangement due to civil construction lapses, there is a risk of blowing up the tower foundation by a strong lightning current passing through it.

  3. #13
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    Quote Originally Posted by Sahib View Post
    Yes but if there is any electrical discontinuity in the arrangement due to civil construction lapses, there is a risk of blowing up the tower foundation by a strong lightning current passing through it.
    You can't live your life trying to figure out what others might due to your electrical work once it is completed if I lived by what if, I'd die of an ulcer.

    And damage from lighting is always a risk when you rely on a concrete-encased electrode but then the code requires your foundation to be utilized as a concrete-encased electrode. Such is our code.

    No matter how you configure it the concrete footer will be grounded, tower bolts are connected to the rebar the tower is bonded at the bottom by an EGC, then there are the coax grounds. Hard to avoid.

    Whether the footer is utilized as an electrode or is grounded as noted above lighting will do as it pleases when it hits a tower, it all depends on the location of the strike, magnitude, duration, and the number of strikes.
    Brian John
    Leesburg, VA

  4. #14
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    Quote Originally Posted by brian john View Post
    No matter how you configure it the concrete footer will be grounded, tower bolts are connected to the rebar the tower is bonded at the bottom by an EGC, then there are the coax grounds. Hard to avoid.
    In one experimental setup, it was found that absence of binding wires caused separation of rebars in a footing structure and it exploded on passage of test impulse current through it.

  5. #15
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    Quote Originally Posted by Sahib View Post
    In one experimental setup, it was found that absence of binding wires caused separation of rebars in a footing structure and it exploded on passage of test impulse current through it.

    I have never doubted that, concrete retains moisture which is one benefit the supporters of the "Ufer" electrode promoted. Trees crack due to the rapid expansion of moisture why wouldn't one expect the same of concrete?
    Brian John
    Leesburg, VA

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