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ekstra   ara
 Post subject: operating switchgear breakers
PostPosted: Sat Apr 09, 2011 6:09 am 
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Joined: Sat May 01, 2010 2:20 am
Posts: 36
We have <600v switchgear main breaker rating is outside the 70e tables. There has not been any arc flash study done on any of the switchgear. IS there anything we can do as far as opening or closing the breakers [ main or feeders ] in this switchgear.


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PostPosted: Sun Apr 10, 2011 5:54 am 
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Joined: Mon Jun 02, 2008 11:58 am
Posts: 1103
Location: Charlotte, NC
Have you considered remote operators?


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PostPosted: Sun Apr 10, 2011 11:39 am 
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yes we did consider that option. n.g. I was wanting to know if there is any interaction as far as opening or closing of the cb aloud by 70e or is nothing aloud because of the cb being outside the foot notes. 480v swichgear


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PostPosted: Mon Apr 11, 2011 4:58 am 
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Joined: Thu Jan 10, 2008 8:49 pm
Posts: 483
Location: New England
The tables don't list a maximum main breaker size, only a maximum fault current of 35kaic for 30 cycles. If you exceed that, then you can do an engineering analysis on just the switchgear to determine IE. But how do you know you exceed the 35Kaic if you haven't done an analysis.


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