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Calculate Bus Bar Size and Voltage Drop
Calculate Bus Bar Size and Voltage Drop (MS Excel Spreadsheet)

Busbar voltage drop calculation

  • Calculate Voltage Drop for  Bus Bar
  • Select Size of Bus Bar for particular Load
  • Enter Your Sub Panel Details like Load,Line Length
Software:Calculate Bus Bar Size and Voltage Drop
Version:22.8.2012 New
Developer:Jignesh Parmar
Size:56 Kb
Price:Free
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Calculate Bus Bar Size and Voltage Drop

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34 Comments


  1. Attah Edwin
    Feb 24, 2021

    Please, how do i select the correct size of a bursar for my feeder panel. I have a transformer rated 500KVA 11kv/0.45kv. I want to connect the low voltage side of the transformer to a feeder panel with three busbars for the three phases and one bursbar for the Neutral that feeds risers. i want to determine the size of busbar i can use in the panel


  2. Abnir Icmat
    Dec 14, 2020

    Can you please send to me the calculation of bus bar riser voltage drop. Thanks for your quick response.


  3. mohamedbesher
    Mar 31, 2020

    good exel sheet calculation


  4. eyuel yilma
    Feb 07, 2020

    Dear sir,

    i want calculations for w x h x d ( 80 x 10 x 1.5 ) mm thick copper bus bar. I want to learn how current capacity is decide based on cross section or dimensions or vise versa. please explain in detail. thanking of you.


  5. eyuel yilma
    Feb 07, 2020

    Hi.
    Can u pl explain to calculate current rating of bus bar. and pls share the formula.


  6. Mobashar
    Dec 11, 2019

    we need excel sheet to calculate voltage drop in bus bar , kindly send me without protection. thanks,


  7. lutfur rahman
    Oct 24, 2019

    this too cool


  8. Deepak Narkhede
    Mar 27, 2019

    Dear sir,

    i want calculations for w x h x d ( 100 x 25 x 1.5 ) mm thick copper busbar. I want to learn how current capacity is decide based on cross section or dimensions or vise versa. please explain in detail. thanking of you.


    • VICTOR ROY
      Jan 27, 2020

      in case of copper bus bar the current carrying capacity is 1.2(max).
      The bus bar 100mm x25mm x1.5mm is suitable for incomer current =(100*25*1.5*1.2)=4500A.
      in case of aluminium bus bar the current carrying capacity is 0.8(max).
      So, the bus bar 100x25x1.5 is suitable for =(100*25*1.5*0.8)=3000A incomer current.


      • akhtar
        Dec 06, 2022

        i believe it is 1200amp per square inch


  9. Shandukani Vhulondo
    Apr 29, 2018

    You need to determine the faul level of the systems and full load current from the customer to determine the CB rating. You can then calculate bus bar rating based on the total connected load supplied by the bus bar and rate you bus bar based on percentages of full load current of connected load. Bus Bar rating are standard sizes based in iEC and IEEE. You have 2500A, 2000A, 800A, 1500A, 600A, 250A, you size bus bar rating based on the three parameters – total connected load of the system, fault level of the system,


  10. juan bautista
    Jul 09, 2016

    Do I have to subscribe to every download or technical article I need?
    Thank you


  11. DJINTHE
    Jul 28, 2015

    Bonjour Monsieur,

    je n’arrive pas à télécharger les fichiers excel. pouvez vous m’aider? svp


  12. sudhakar
    Jul 24, 2015

    Hi.
    Can u pl explain hot to calculate current rating of bus bar. and pls share the formula.


  13. Zeeshan
    Feb 12, 2015

    Please provide an example… unable to understand that how to use..??


  14. mahmoud fawaz
    Nov 30, 2014

    Hi. How to calculate the drop voltage for 25mm2 cable three phaze +earth . 350m 4 A


  15. RJ Ordonez
    Sep 30, 2014

    there’s no unit for power on the spread sheet. is it in kva or kw? thanks!


  16. Lele
    Aug 18, 2014

    Dear EEP
    Do I have to subscribe to every download or technical article I need?
    Thank you
    Lele


  17. Sagar Jadhav
    Jul 27, 2014

    bus bar formula


    • ajit bhatavkar
      Aug 08, 2014

      Pls give me my email id bus bar formula

      Regad
      Ajit


  18. Sagar Jadhav
    Jul 27, 2014

    Dear sir,
    I ask you what is the bus bar calculation formula?


  19. sohel
    Jun 26, 2014

    In case of Busbar voltage drop calculation you take Resistance=0.005 ohm and reactance=0.011 ohm . what is the reference of these values. have any international code ? also how can i get a cable resistance and reactance ?


  20. Marvin
    Feb 15, 2014

    Very useful..Thank you very much..


  21. kakamta
    Nov 01, 2013

    thanks.but i don’t understand the way to calculation. please help?


  22. m.taqi
    Oct 25, 2013

    thanks


  23. Ronald Acuavera
    Oct 09, 2013

    please advise and calculate, i have 5x1250Amps,.8pf, 220v gensets, synch to a common busbar, and two outgoing CB’s of 2500A, what will be the main busbar rating.


  24. NAGARAJ123
    Jun 19, 2013

    IN BUSBAR TRUNKING SYSTEM HOW DO YOU CALCULATE THE KA RATING OF THE BUSBAR. FOR EXAMPLE IF CUSTOMER ASKS US TO GIVE 50KA WITH 50x10mm ALLUMINIUM OR COPPER BUSBAR WHAT IS THE FORMULA WE HAVE TO APPLY PLEASE SOME ONE WHO KNOWS ABOUT HIS GUIDE ME


    • Edvard
      Jun 19, 2013

      Customer normally shouldn’t ask you this, but to tell you the ratings of loads, so you can calculate the CBs in incomers and outgoing cubicles, as well as rating of main horizonal busbars. When you have all these information, you can calculate short curcuit withstand current on busbars.


  25. Eng. Bo.7sn
    May 27, 2013

    I entered the results but I didn’t know what is sin(phi) so i put it =0
    and the results below:
    ——————————————-
    Selected BusBar is Correct
    3.92 (Within Limit)
    ———————————————
    What is the size of the bus bar ?


  26. yaqob
    Apr 24, 2013

    thank you for this great website
    but unfortunately I couldn’t download the excel calculation files! what should I do?


  27. sazali
    Mar 11, 2013

    thank a lot for all notes had published in this portal……


  28. pankajbhai Trivedi
    Jan 16, 2013

    Thanks for my registration.
    Pl. tell me How/D.G set automatically start when mains supply fails.


    • Naheem
      Dec 26, 2018

      By a relay called LVM(low voltage monitor), it will provide NO/NC contact to DG to start/stop

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