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Thread: Bus duct VD calculation

  1. #1
    Join Date
    Jul 2008
    Location
    nyc
    Posts
    243

    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

  2. #2
    Join Date
    Jun 2017
    Location
    WI, USA
    Posts
    219
    If you are being cost conscious, distributed is fine. Conservatively, you’d use concentrated at end of run.

  3. #3
    Join Date
    Jun 2003
    Posts
    6,760
    to get the most accurate voltage drop, use the concentrated load and figure each section of bus duct individually, and add the results.

  4. #4
    Join Date
    Oct 2016
    Location
    Cleveland, Ohio
    Posts
    95
    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.

  5. #5
    Join Date
    Jan 2016
    Location
    PA
    Posts
    4,183
    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



  6. #6
    Join Date
    Oct 2016
    Location
    Cleveland, Ohio
    Posts
    95
    Thank you

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