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Thread: 12 kV conductors from pole to underground transition

  1. #11
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    Quote Originally Posted by GoldDigger View Post
    The inductance of an isolated conductor carrying AC can be significantly higher than for the same conductor in a three phase bundle, even when there is no ferromagnetic material involved.

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    I guess it comes down to what exactly is meant by "bundle" or "grouped". On one end of the spectrum we could have direct buried conductors that prob ly would be installed the same way in either case. What about iso phase pvc conduits that are right next to each other?
    Ethan Brush - East West Electric. NY, WA. MA

    "You can't generalize"

  2. #12
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    Quote Originally Posted by electrofelon View Post
    What about iso phase pvc conduits that are right next to each other?
    Inductance is more when separation distance between iso phase PVC conduits is more and so is voltage drop.

  3. #13
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    This voltage level is often encountered in large industrial facilities. A typical design would be a three phase pothead on the pole connected to 3/c armored cable for direct burial to a unit substation primary switch.

  4. #14
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    Quote Originally Posted by smarteng View Post
    Hello Sir/Madam

    When transitioning from pole to underground, can we have all 3 phase wire in one conduits or do we need to have one conduit per phase. ( overhead conductor :ACSR, underground : 15KV shielded cable ) Also, whats better practice for underground medium voltage 12 kV line, separate conduit per phase or all cable in one conduit.

    Thank you.
    Depends on who owns the line. If it's the utility you will need to follow there requirements. If it's privately owned then follow NESC.
    "Just because you're paranoid, doesn't mean they're not out to get you"

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