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Thread: Bus duct VD calculation

  1. #1
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    Bus duct VD calculation

    I'm calculating VD on a bus duct.
    The run is 400ft,
    At 275ft there is a meter bank another one at 350ft and lastly one at 400ft.
    With the various online calculators there are 2 options , distributed load & concentrated load.
    I'm thinking that I should be working of distributed load whereas others think I should be using concentrated load to the 1st set of meter banks & segmented loads after that.
    This makes a big difference as VD is halved if I can use the distributed load.
    Which table should I use?
    cmac1

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    If you are being cost conscious, distributed is fine. Conservatively, you’d use concentrated at end of run.

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    to get the most accurate voltage drop, use the concentrated load and figure each section of bus duct individually, and add the results.

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    mcelweec

    "With the various online calculators there are 2 options , distributed load & concentrated load."

    Would you please post some "LINKS" or name the sites for a few of these calculators.

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    Quote Originally Posted by MyCleveland View Post
    mcelweec

    "With the various online calculators there are 2 options , distributed load & concentrated load."

    Would you please post some "LINKS" or name the sites for a few of these calculators.
    http://www.eaton.com/ecm/groups/publ.../ct_152882.xls

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    Thank you

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    Ingenieur

    Have you used this program ?

    If you understand the inputs.....can you explain difference between cell B1 & B13 ?

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    Quote Originally Posted by MyCleveland View Post
    Ingenieur

    Have you used this program ?

    If you understand the inputs.....can you explain difference between cell B1 & B13 ?
    'actual' B1 is your connected load
    'upsize' B13 (B10?) is if you want future expansion
    say your load is currently 1000 (actual), and it will be 1250 (upsize) in 2 years after expansion
    if no expansion or increase in load is planned actual = upsize

    play with it
    change inputs and see how it changes the results
    Last edited by Ingenieur; 12-23-17 at 12:53 PM.

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    Ingenieur

    Thanks again
    I am tinkering...here is a rub. If B13 is not a table value (Standard Size), then everything collapses.

    I will start with retagging a few things and adding some conditional drop downs.

    May I reach out again later ?

  10. #10
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    Concentrated vs Distributed....division by 2.
    Guess I thought more options in the input selections were available.

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