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4 comments
Power-User

Join Date: Mar 2009
Posts: 125

MCCB Calculations

03/19/2009 8:38 PM

Dear All Guru

I hv 1000Kva (6600/433v 3Phase 50Hz) transformer and feed to main switch board with 1600 A ACB and 20 number of varies size MCCB. - from 30A to 600A

Please advise me how to calculate the KA (Breaking current) for my HT breaker,LT breaker,bus bar size,out going cable from transformer to Main switch board etc.

How to calculate the fault level for this electrical installation.

Thank you very much

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Guru
United States - Member - New Member

Join Date: Jun 2008
Location: Alabama
Posts: 1616
Good Answers: 61
#1

Re: How to select MCCB KA at Main Switch Baord

03/19/2009 9:41 PM

This article should make the calculations very simple.

http://ecmweb.com/mag/electric_shortcircuit_calculation_methods/?smte=wr

Remember all of the breakers in the MCCB must all be rated for the available fault current.

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Guru
Safety - ESD - New Member India - Member - New Member Engineering Fields - Energy Engineering - New Member

Join Date: May 2007
Location: Pune , India
Posts: 822
Good Answers: 39
#2
In reply to #1

Re: How to select MCCB KA at Main Switch Baord

03/20/2009 9:20 AM

wareagle

Very useful link . GA

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Power-User

Join Date: Mar 2009
Posts: 125
#3
In reply to #1

Re: How to select MCCB KA at Main Switch Baord

04/05/2009 8:14 PM

Dear wareagle,

Thank yo very much of your website link.

Best Regards

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Anonymous Poster
#4

Re: MCCB Calculations

05/31/2010 2:40 AM

bad answer!!!

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Users who posted comments:

aikhh (1); Anonymous Poster (1); V.I.Abraham (1); wareagle (1)

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