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Thread: Table 250.102 (C) (1)

  1. #11
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    what is a single phase delta

    not clear why you're asking the question? surely you know the answer. if on the other hand you're trying to make a particular point, please let me in on what that would be.

    thanks

  2. #12
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    Quote Originally Posted by ohmboyz View Post
    not clear why you're asking the question? surely you know the answer. if on the other hand you're trying to make a particular point, please let me in on what that would be.

    thanks
    Your terminology, a pun. A delta by its make up is three phase. You were referring to the tranny that is center tapped for single phase from a delta set up.

    There is no such thing as a single phase delta tranny.

    See?
    "Electricity is really just organized lightning." George Carlin


    Derek

  3. #13
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    well dang if i haven't been wrong all these years

    i've worked as a licensed sparktrician for more than thirty years. Whether in Chi-town, the western North Carolina mountains, Pennsylvania, Michigan and Ohio, a single family residential service was commonly understood to be fed from a three phase delta transformer,hence the 240/120/ voltage and the peculiar 240/120/plus c leg stinger for a three phase panel.

    now, come to find out me and a bunch of other fools been swallowed up by a bermuda triangle.

  4. #14
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    Quote Originally Posted by ohmboyz View Post
    i've worked as a licensed sparktrician for more than thirty years. Whether in Chi-town, the western North Carolina mountains, Pennsylvania, Michigan and Ohio, a single family residential service was commonly understood to be fed from a three phase delta transformer,hence the 240/120/ voltage and the peculiar 240/120/plus c leg stinger for a three phase panel.

    now, come to find out me and a bunch of other fools been swallowed up by a bermuda triangle.
    Wow, they really call a single center tapped tranny a delta? Totally incorrect.

    While the properties of the two are similar in regards to deriving 120/240V, the term delta is only appropriate to the three phase system.

    Deltas with one tranny center tapped for 120/240. Note that corner grounded and ungrounded deltas exist also, but no 120V is derived from those set ups.

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    Last edited by jumper; 02-15-18 at 08:15 PM.
    "Electricity is really just organized lightning." George Carlin


    Derek

  5. #15
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    Quote Originally Posted by ohmboyz View Post
    not clear why you're asking the question? surely you know the answer. if on the other hand you're trying to make a particular point, please let me in on what that would be.
    If you're asking me, no, I don't know the answer and I'm not trying to make a point.
    Code references based on 2005 NEC
    Larry B. Fine
    Master Electrician
    Electrical Contractor
    Richmond, VA

  6. #16
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    Quote Originally Posted by ohmboyz View Post

    now, come to find out me and a bunch of other fools been swallowed up by a bermuda triangle.
    Open delta triangle obviously

  7. #17
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    OK guys, let's please not let language get in the way of communication.
    Charles E. Beck, P.E., Seattle
    Comments based on 2017 NEC unless otherwise noted.

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