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Thread: Isolation transformer for residential dock power

  1. #11
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    Quote Originally Posted by ghostbuster View Post
    It would appear this lake water maybe energized from another nearby electrical source and the utility neutral return current is using this ground system to "get back" to the utility primary neutral/ground side.

    This is an extremely dangerous situation and can get much worse really fast.

    A similar situation has already been fully documented on this website.
    Except there are no other possible sources nearby and this occurs at many residential docks many miles apart on two lakes with the common factor being they are served by the same utility.

  2. #12
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    As suggested,find the article on this website.It deals with an underground faulty primary neutral beside a lake " dumping neutral current into the entire lake " and caused electrocution deaths to the swimmers. A court case followed.
    May the force be with you

  3. #13
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    Quote Originally Posted by ghostbuster View Post
    It would appear this lake water maybe energized from another nearby electrical source and the utility neutral return current is using this ground system to "get back" to the utility primary neutral/ground side.

    This is an extremely dangerous situation and can get much worse really fast.

    A similar situation has already been fully documented on this website.
    I'm curious why you would go to a fault energizing the lake instead of the lake being a parallel bath to the utility grounding system and the voltage coming from voltage drop on the PoCo's wiring or a PoCo neutral developing a higher resistance than desired?

    I'm not saying you are wrong but you seem to have ruled out other possibilities.

  4. #14
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    Quote Originally Posted by normel View Post
    .. Issue is stray voltage on the existing grounding conductor that causes a mild “tingle” to swimmers when exiting the water. ...
    A "mild" tingle in the water is life-threatening.
    https://www.webmd.com/fitness-exerci...-silent-killer
    https://www.electricshockdrowning.org/

    People shouldn't be in the water anywhere near an electrified pier.



    Quote Originally Posted by oldsparky52 View Post
    ... One thought was to drive ground rods down near the waterway and make it part of the grounding system. While that should mask the symptom, are we just transferring the problem out into the water? ...
    That was my first thought, too: Surround the whole area with an equipotential grounding system, like a swimming pool or dairy barn.

    Quote Originally Posted by oldsparky52 View Post
    ... That makes me nervous.
    Yeah, me too, after thinking about it for a few minutes.
    If you don't really understand the root cause of the problem, you can't assure that you've adequately mitigated it.
    And if you don't have access to the root cause, you never know when it will get worse, rendering all your mitigation efforts inadequate and the site unsafe.

  5. #15
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    Quote Originally Posted by normel View Post
    Issue is stray voltage on the existing grounding conductor that causes a mild “tingle” to swimmers when exiting the water.
    Can we get some clarity on how they are exiting the water? Are they climbing an aluminum ladder (bonded to the equipment ground?) on a dock, are they just walking out of a sloped bank (step voltage shock?)?

  6. #16
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    Quote Originally Posted by oldsparky52 View Post
    Can we get some clarity on how they are exiting the water? Are they climbing an aluminum ladder (bonded to the equipment ground?) on a dock, are they just walking out of a sloped bank (step voltage shock?)?
    Climbing out of the water on an aluminum ladder bonded to the dock.

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