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Thread: Fast Delta Calc

  1. #1
    Join Date
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    Fast Delta Calc

    Hi ,
    Do you think that I can estimate a remodeled warehouse load supplied by the existing 120/240V, 4wire, 3 phase service
    this way ?????????;


    General ltg w/ 25% LCL = 2400VA @ 120/240v, 1 ph. = 10A
    Gen. use recept @ 100= 2400VA= @ 120/240, 1ph= 10A
    special . use recept @ 100= 4800VA= @ 120/240, 1ph= 20A
    miscel. @ 100= 1200VA= @ 120/240, 1ph= 5A

    Motorized load @ 100= 12,450VA @ 415V, 1ph= 30A (some used the high leg)
    roof mtd AC load @ 100= 12,450VA @ 415V, 3ph= 30A

    sub total , 2pole+3 ph loads= 60A
    sub total, 1 ph, grounded loads= 45A
    Largest motor @ 25%= 2075VA @ 415V= 5 A
    120% PF for existing-old motorized loads= (13000 x 1.2= 15,600 / 415V= 38A

    Concluded that;
    minimum service @ 120/240, 3 ph, 4w required is; 148A

    Thank you

  2. #2
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    Quote Originally Posted by Toros View Post
    Hi ,

    roof mtd AC load @ 100= 12,450VA @ 415V, 3ph= 30A

    ...

    Concluded that;
    minimum service @ 120/240, 3 ph, 4w required is; 148A

    Where is the 415V coming from?

  3. #3
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    Quote Originally Posted by david luchini View Post
    Where is the 415V coming from?
    One might also wonder abput this:

    "the existing 120/240V, 4wire, 3 phase? service "
    Si hoc legere scis nimium eruditionis habes.

  4. #4
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    Quote Originally Posted by david luchini View Post
    Where is the 415V coming from?
    240v x 1.73=415 v

  5. #5
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    Quote Originally Posted by Toros View Post
    240v x 1.73=415 v
    Sounds like EU voltages. Except for the 120V.
    Si hoc legere scis nimium eruditionis habes.

  6. #6
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    Quote Originally Posted by Besoeker View Post
    Sounds like EU voltages. Except for the 120V.
    Its this:






    Delta high leg is great for long runs because standard 208-230 volt motors are unlikely to encounter under voltage issues.
    What is esoteric knowledge today will be common knowledge tomorrow.

  7. #7
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    mbrooke

    Excellent graphics....can I ask what program was used to generate, or was this all cut and paste ?

  8. #8
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    Quote Originally Posted by mbrooke View Post
    Its this:






    Delta high leg is great for long runs because standard 208-230 volt motors are unlikely to encounter under voltage issues.
    But no mention of 415V.
    Si hoc legere scis nimium eruditionis habes.

  9. #9
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    Quote Originally Posted by MyCleveland View Post
    mbrooke

    Excellent graphics....can I ask what program was used to generate, or was this all cut and paste ?
    They are Mike Holt's. Not sure what program he or his team made them on, but they sure are the best graphics bar none.


    Quote Originally Posted by Besoeker View Post
    But no mention of 415V.
    Oppps- missed that But to be fair you do get 415 volts L-N on a 240/480 delta.
    What is esoteric knowledge today will be common knowledge tomorrow.

  10. #10
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    Quote Originally Posted by mbrooke View Post
    They are Mike Holt's. Not sure what program he or his team made them on, but they sure are the best graphics bar none.




    Oppps- missed that But to be fair you do get 415 volts L-N on a 240/480 delta.
    Don't see how but then I'm thick according to one of the mods here.
    Si hoc legere scis nimium eruditionis habes.

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