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Thread: Grounding electrode

  1. #1
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    Grounding electrode

    Can my structure rebar be my grounding electrode, will it deteriorate; my tests show it has less resistance than a rod making it ideal for grounding which seems to not be working as ground at all , seven deadly grounding sins says it will deteriorate the structure. I tried the ground rod in a well adobe the water and it’s not showing any grounding capacity , does a ground rod even work as intended some all ground is not the same diferente resistance how does one compensate

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    The answer is not a simple yes or no. The answer is a legal grounding electrode is defined in the code sometimes the rebar in the concrete is a legal grounding electrode sometimes it's not. As far as whether it is a good ground or not it really doesn't matter. What you need to do is meet the minimum requirements the code requires to get all of the dubious benefits of the grounding electrode.
    Bob

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    A ufer ground or a concrete encased electrode is a far better electrode than a ground rod. If I had to choose between the two then there is no doubt I would choose a concrete encased electrode. The concrete encased electrode is the rebar in a footing that is tied to the service equipment with a minimum #4 copper conductor.

    Here is what the NEC states... I know you are in Mexico so I don't know if that matters

    (3) Concrete-Encased Electrode. A concrete-encased electrode
    shall consist of at least 6.0 m (20 ft) of either (1) or (2):
    (1) One or more bare or zinc galvanized or other electrically
    conductive coated steel reinforcing bars or rods of not
    less than 13 mm (1∕2 in.) in diameter, installed in one
    continuous 6.0 m (20 ft) length, or if in multiple pieces
    connected together by the usual steel tie wires, exothermic
    welding, welding, or other effective means to create a
    6.0 m (20 ft) or greater length; or
    (2) Bare copper conductor not smaller than 4 AWG
    Metallic components shall be encased by at least 50 mm
    (2 in.) of concrete and shall be located horizontally within that
    portion of a concrete foundation or footing that is in direct
    contact with the earth or within vertical foundations or structural
    components or members that are in direct contact with
    the earth. If multiple concrete-encased electrodes are present
    at a building or structure, it shall be permissible to bond only
    one into the grounding electrode system.
    They say I shot a man named Gray and took his wife to Italy
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  4. #4
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    As an engineer the NEC always throws we with the term "bonding", it makes me think CadWeld which is how NASA bonded to ground wires. Seems to me a screw in a panel or on a clamp is a connection instead of a bond.

  5. #5
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    Quote Originally Posted by Juliolagos View Post
    Can my structure rebar be my grounding electrode, will it deteriorate; my tests show it has less resistance than a rod making it ideal for grounding which seems to not be working as ground at all , seven deadly grounding sins says it will deteriorate the structure. I tried the ground rod in a well adobe the water and it’s not showing any grounding capacity , does a ground rod even work as intended some all ground is not the same diferente resistance how does one compensate
    If you're building the houses on a slab. Use the concrete encased rebar. But you'll need to hide the copper sticking out during construction. Otherwise it will get cut stolen. The metal water line is best. But you'll likely be using plastic for that.

  6. #6
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    For the Ufer ground stub up a lenght of 1/2" rebar thru the slab. Connect your GEC to the rebar with an acron clamp (check listing). If this is in a finished wall put a 2 gang mud ring opposite to allow accessibility.

    If you use a metallic water line you will need to supplement with another electrode, normally ground rods. Use the Ufer and you are done
    Moderator-Washington State
    Ancora Imparo

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