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 Post subject: How to calculate Bolted Fault CurrentPosted: Fri Jul 22, 2011 2:21 pm

Joined: Fri Jul 22, 2011 12:05 pm
Posts: 1
I am performing an arc flash analysis for my company and I have noticed that the IEEE 1584 calculations require the use of "bolted fault current". How is this calculated and is there a site that goes further into explaining how to calculate this value?

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 Post subject: Posted: Fri Jul 22, 2011 11:29 pm
 Arc Level

Joined: Wed Jun 04, 2008 9:17 am
Posts: 428
Location: Spartanburg, South Carolina
Bolted fault current is just the normally calculated fault current with no fault impedance. IEEE Red Book Std 141 is a good source for calculations, but there are many good sources. IEEE Std 1584 comes with a Bolted Fault Current Calculator Excel spreadsheet.

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 Post subject: Posted: Mon Jul 25, 2011 10:53 am

Joined: Sun Jul 13, 2008 5:00 pm
Posts: 24
The Red Book is a great resource. There is also a newer IEEE standard:

551-2006 - IEEE Recommended Practice for Calculating AC Short-Circuit Currents in Industrial and Commercial Power Systems.

It's referred to as the Violet Book.

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 Post subject: Posted: Tue Jul 26, 2011 1:50 pm

Joined: Wed Aug 06, 2008 9:19 am
Posts: 3
tdriller wrote:
I am performing an arc flash analysis for my company and I have noticed that the IEEE 1584 calculations require the use of "bolted fault current". How is this calculated and is there a site that goes further into explaining how to calculate this value?

Umm, if bolted fault current calculations are a question, you might need help performing the arc flash study.

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 Post subject: Posted: Tue Jul 26, 2011 3:03 pm

Joined: Fri Sep 25, 2009 5:00 pm
Posts: 43
This is actually easier than you might imagine. The software that is used to perform the arc flash study can also perform the bolted short circuit calculations using the same data base. I'm not sure if every program does, but all the major ones do.

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 Post subject: Posted: Tue Dec 06, 2011 7:28 am

Joined: Tue Dec 06, 2011 7:19 am
Posts: 1
Kim L. wrote:
Umm, if bolted fault current calculations are a question, you might need help performing the arc flash study.

Umm............ Maybe that's why he is here asking for help? Just sayin'

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 Post subject: Posted: Wed Dec 07, 2011 10:16 am
 Sparks Level

Joined: Sat Jun 07, 2008 5:11 pm
Posts: 143
Location: Connecticut
Check the Cooper Electric website... a good source of info. Also there are a number of free Excel spreadsheet programs on the net.

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