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# Calculate Bus Bar Size and Voltage Drop (Spreadsheet)

## Busbar voltage drop calculation

• Calculate Voltage Drop for  Bus Bar
• Select Size of Bus Bar for particular Load
 Software: Calculate Bus Bar Size and Voltage Drop Version: 22.8.2012 Developer: Jignesh Parmar Size: 56 Kb Price: Free Download: Right here | Video Courses | Membership | Download Updates

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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

Jul 27, 2014

bus bar formula

• ajit bhatavkar
Aug 08, 2014

Pls give me my email id bus bar formula

Ajit

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

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