Equation for Rectangular Busbar Size and Current Carrying Capacity for 200kW MDB

Report a violation of the law

Reply | New topic

#1 21672550 12 Oct 2014 10:04

Chandrapaul Das Chandrapaul Das

Anonymous

Post #1
21672550 12 Oct 2014 10:04

Hello,
i have to design MDB for a 200 KW 3-phase system.there i will use 5 busbars three for phases and one for neutral and another for earthing.kindly tell me what is the proper equation to measure rectangular busbar size?how to measure current carrying capacity of a rectangular busbar?

also tell me how to measure current carrying capacity of a copper rod to use in ground earthing system?

looking for your help...

Chandrapaul Das
ADVERTISEMENT
#2 21672551 12 Oct 2014 18:54

ASAD ALI ASAD ALI

Anonymous

Post #2
21672551 12 Oct 2014 18:54

Lets assume 415 Volts and power factor 0.8
so current will be
I=200,000/1.73*415*0.8

348 Amp

Lets Divide it by two and we shall get 174. so we need bus bar with the size of 174 or greater area.Take 20x5 mm2 area bus bar which is more then enough for this MDB.
ADVERTISEMENT
#3 21672552 13 Oct 2014 08:39

Chandrapaul Das Chandrapaul Das

Anonymous

Post #3
21672552 13 Oct 2014 08:39

why should i divide it by two?in three phase it should be three.am i right?

if busbar width 20mm and thickness 5 mm.then how much current it will carry?what is the equation?
ADVERTISEMENT
#4 21672553 13 Oct 2014 14:02

ASAD ALI ASAD ALI

Anonymous

Post #4
21672553 13 Oct 2014 14:02

it is a thumb
#5 21672554 13 Oct 2014 14:04

ASAD ALI ASAD ALI

Anonymous

Post #5
21672554 13 Oct 2014 14:04

it is a thumb rule that you have to divide the total single phase current to measure the area of cu busbar. the maximum Amp rating of 20x5 mm2 busbar is 200A.
Create an account, log in here. You will receive points by participating in discussions.
Join this discussion.

Install Elektroda application

Didn't find an answer? Ask Artificial Intelligence

*I agree to send the question to OpenAI, Anthropic PBC, Perplexity AI, Inc., Kagi Inc., Google LLC - owners of language models in order to prepare the best response. The companies may monitor and log information entered into the form.

*I agree to publicly display my question and answer. The question and answer will be publicly available to everyone. The process may take a few minutes. Upon completion, you will be redirected to the page with the answer.

Wait...(2min)

Reply | New topic

Report a violation of the law

Equation for Rectangular Busbar Size and Current Carrying Capacity for 200kW MDB

Didn't find an answer? Ask Artificial Intelligence