MCCB Calculations

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aikhh Power-User Join Date: Mar 2009 Posts: 130	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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wareagle Guru Join Date: Jun 2008 Location: Alabama Posts: 1610 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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V.I.Abraham Guru Join Date: May 2007 Location: Pune , India Posts: 875 Good Answers: 41	#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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aikhh Power-User Join Date: Mar 2009 Posts: 130	#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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aikhh (1); Anonymous Poster (1); V.I.Abraham (1); wareagle (1)