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Thread: Ungrounded Delta 480V/3-Phase/3-Wire System

  1. #21
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    Quote Originally Posted by iwire View Post
    I do not think every ungrounded system had these, I think in the past they were optional.
    I've only seen one of these in a factory that is long gone. I know of another but have never worked on it.
    Tom
    TBLO

  2. #22
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    Any wye connected "loads" to this system, and it is easy to overlook surge protection or ground fault monitoring, will create a "neutral point" on the system.

    Even someone miswiring a wye wound motor or transformer primary, connecting the center point to ground, will create a neutral point on the system.

  3. #23
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    Quote Originally Posted by iwire View Post
    I do not think every ungrounded system had these, I think in the past they were optional.
    Ive done some work on a mill in Prov and its got an old 600 V service. No ground detectors. I think it is ungrounded, even though a meter shows it as corner grounded. I think that is just a fault, perhaps even a high impedance one.
    Ethan Brush - East West Electric. NY, WA. MA

    "You can't generalize"

  4. #24
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    Quote Originally Posted by electrofelon View Post
    Ive done some work on a mill in Prov
    It strikes me funny you have worked so close by.

    I can be pretty much anywhere in Providence in 15 minutes from where I am sitting.

  5. #25
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    Quote Originally Posted by iwire View Post
    I can be pretty much anywhere in Providence in 15 minutes from where I am sitting.
    Perfect! Ill call you next time I need help on a saturday or sunday

    I'm actually not there that much, just one friend of a friend I do some work for now and then.
    Ethan Brush - East West Electric. NY, WA. MA

    "You can't generalize"

  6. #26
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    Quote Originally Posted by iwire View Post
    It strikes me funny you have worked so close by.

    I can be pretty much anywhere in Providence in 15 minutes from where I am sitting.


    If you're sitting at home, I don't see how that's possible.

  7. #27
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    Quote Originally Posted by electrofelon View Post
    Perfect! Ill call you next time I need help on a saturday or sunday

    I'm actually not there that much, just one friend of a friend I do some work for now and then.
    Please let me know where you're working next time so I can report you.

  8. #28
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    Quote Originally Posted by peter d View Post


    If you're sitting at home, I don't see how that's possible.


    Google says 21 minutes to Prov place mall.

    I apologize for the exaggeration.

  9. #29
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    Quote Originally Posted by iwire View Post


    Google says 21 minutes to Prov place mall.

    I apologize for the exaggeration.
    Yeah, but try going anywhere not directly on the highway. It will take a bit more than that.

    -480sparky

  10. #30
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    Quote Originally Posted by peter d View Post
    Please let me know where you're working next time so I can report you.
    Ethan Brush - East West Electric. NY, WA. MA

    "You can't generalize"

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