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 Post subject: Disconnect switches
PostPosted: Tue Jun 21, 2011 10:40 am 
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Joined: Sat Jun 18, 2011 11:41 pm
Posts: 1
Hi everyone, I am new to arc flash studies and doing short circuit current ratings of Disconnet switches. I don't have idea from what procedure to follow to find bolted three phase current of 480V 90A switch. Any suggestions !


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PostPosted: Fri Jun 24, 2011 5:51 pm 
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Joined: Sat Jun 07, 2008 5:11 pm
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Location: Connecticut
Check the device manufacture's spec sheet or catalog. Most disconnects as well as starters, MCC's, etc. are labeled with ratings. This is pretty basic stuff. If you have no idea how to find a device duty rating or calculated fault current at a specific point in the system, maybe you shouldn't be doing the study.


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PostPosted: Mon Jun 27, 2011 6:39 am 
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Try looking at the Bussman document at

http://www.cooperindustries.com/content/dam/public/bussmann/Electrical/Resources/Solution%20Center/technical_library/BUS_Ele_Tech_Lib_Electrical_Formulas.pdf

for a start.


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