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Thread: Neutral voltage

  1. #31
    Join Date
    Feb 2013
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    India
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    Quote Originally Posted by cknight View Post
    even if the bond is bad wouldn't the NEV be the same on both sides of the pool? Or at least close. The east side and the water read the same. Disconnect the bond and everything reads the same. Usually the NEV is the same all the way around the pool right? At least in the earth. Probably overthinking this. What is safer? No bond connected back to pool pump and all at the same reading or bonding it and having 3 volts present.
    NEV will remain same if ground resistance is zero. In your case it is not so. So you see different NEV's at different measurement points.You cannot dispense with bonding. It is a code violation. Apparently, with bonding you are getting shocked. The solution may be as I suggested earlier: Provide (additional) loop with a metal strip around the pool bonding all the nearby metal objects.

  2. #32
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    Dec 2007
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    NE Nebraska
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    Quote Originally Posted by cknight View Post
    even if the bond is bad wouldn't the NEV be the same on both sides of the pool? Or at least close. The east side and the water read the same. Disconnect the bond and everything reads the same. Usually the NEV is the same all the way around the pool right? At least in the earth. Probably overthinking this. What is safer? No bond connected back to pool pump and all at the same reading or bonding it and having 3 volts present.
    The east side and the water appear to both be at "ground" potential. Some point. They either are not bonded or some point in bonding between those and the other items has failed. You want everything at same potential - hence the reason for all the bonding. but you must also bring EGC to pool pump or other electrical equipment in the vicinity - that introduces any rise in voltage from the service grounded conductor (which is normal to have low levels of rise on it because of voltage drop when it is carrying current) If everything is bonded well, you won't measure that voltage in the pool vicinity, you will measure it to ground references placed away from the pool area though. If you do measure it in the pool area one item is at ground potential and the other is at the equipotential bonding system potential.

    Again you are not "grounding" objects in the pool area, you are "bonding" them together so there isn't any potential between them.
    I live for today, I'm just a day behind.

  3. #33
    Join Date
    Jan 2008
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    Quote Originally Posted by kwired View Post
    I agree, but isn't stray voltage only "stray" until you know what is causing it?

    Most of what people call "stray voltage" on a neutral is just results of voltage drop somewhere on that MGN, cause might be from primary current, might be from secondary current - either way there is a rise in voltage to "ground" when there is voltage drop across an otherwise grounded conductor, and if current is flowing there is some voltage drop across that conductor.
    Stray voltage is a potential that should not exist during normal equipment or system operations. The 3 volt NEV may be completely normal but we do not know. I would call 10 volts abnormal under most conditions. 3 volts is not so rare.

    Normal NEV is, by definition, not stray voltage.
    BB+/BB=?

  4. #34
    Join Date
    Jan 2008
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    Quote Originally Posted by cknight View Post
    even if the bond is bad wouldn't the NEV be the same on both sides of the pool? Or at least close. The east side and the water read the same. Disconnect the bond and everything reads the same. Usually the NEV is the same all the way around the pool right? At least in the earth. Probably overthinking this. What is safer? No bond connected back to pool pump and all at the same reading or bonding it and having 3 volts present.
    The NEV will be the same on both sides if you have a good bond between both sides.

    It is safer with a bond and 3 volts all around.
    BB+/BB=?

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