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

  1. #31
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    Quote Originally Posted by peter d View Post
    Yeah, but try going anywhere not directly on the highway. It will take a bit more than that.

    -480sparky

  2. #32
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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.
    Still common in the surface facilities of underground mining
    Not so much otherwise

    I would say with a hi Z meter right at the xfmr lugs to the same point the voltages would be closely balanced



  3. #33
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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.
    Is that because of how much Jack Daniels he has in him?

  4. #34
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    If there is no neutral point created in the factory, on the secondary side of the coil itselt, which will create a wild leg on the B or C phase, then it appears as if the intent of the manufacture was for you to use it to create your own corner grounded delta system. This may seem counter intuitive, but this how many old delta systems were done.

    Sent from my LG-H811 using Tapatalk

  5. #35
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    Answer

    another method that you could use to test the voltage is using an ohmmeter. This way you can get an accurate reading if any moderations.

  6. #36
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    Quote Originally Posted by Dominicbell View Post
    another method that you could use to test the voltage is using an ohmmeter. This way you can get an accurate reading if any moderations.
    Ohmmeters don't like to have voltage applied to them, you sure you meant what you said?

  7. #37
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    Quote Originally Posted by kwired View Post
    Ohmmeters don't like to have voltage applied to them, you sure you meant what you said?
    I see he is a beginning apprentice. I was hoping he meant VOM.
    Tom
    TBLO

  8. #38
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    Quote Originally Posted by ptonsparky View Post
    I see he is a beginning apprentice. I was hoping he meant VOM.
    How many farmers do you work for that have a cheap $20 analog meter they use to troubleshoot irrigation equipment with, and once in a while have it on ohms setting and connect it across 480 volts? I still see several of these guys and they never learn from that mistake. I try to tell them they need a automatic volt/continuity tester that has no switch, but those cost too much

    Seems to me, and considering you are lucky enough not to need medical care after the thing blows up in your hand, the thing will pay for itself after burning up 2 or 3 cheap meters.

  9. #39
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    Quote Originally Posted by kwired View Post
    How many farmers do you work for that have a cheap $20 analog meter they use to troubleshoot irrigation equipment with, and once in a while have it on ohms setting and connect it across 480 volts? I still see several of these guys and they never learn from that mistake. I try to tell them they need a automatic volt/continuity tester that has no switch, but those cost too much

    Seems to me, and considering you are lucky enough not to need medical care after the thing blows up in your hand, the thing will pay for itself after burning up 2 or 3 cheap meters.
    I have one that was using the little neon glow testers. I chastised him multiple times. I finally bought him a Fluke TPro. I considered it a 'seed corn hat'.
    Tom
    TBLO

  10. #40
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    Quote Originally Posted by kwired View Post
    How many farmers do you work for that have a cheap $20 analog meter they use to troubleshoot irrigation equipment with, and once in a while have it on ohms setting and connect it across 480 volts? I still see several of these guys and they never learn from that mistake. I try to tell them they need a automatic volt/continuity tester that has no switch, but those cost too much

    Seems to me, and considering you are lucky enough not to need medical care after the thing blows up in your hand, the thing will pay for itself after burning up 2 or 3 cheap meters.
    You'd have to fry an awful lot of free-with-coupon Harbor Freight meters before it would pay to get a Fluke!


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