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 Post subject: Arc flash value
PostPosted: Thu Apr 19, 2012 2:05 pm 
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Sparks Level

Joined: Mon Apr 14, 2008 7:10 am
Posts: 142
We have been asked to put arc flash value on our distribution single line diagram. What kind of information you think that we should put on the drawing for each equipment? We used to put SC value for each bus but it is the first time for arc flash.


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PostPosted: Thu Apr 19, 2012 2:47 pm 
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Joined: Mon Jun 02, 2008 11:58 am
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Location: Charlotte, NC
The calculated incident energy


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PostPosted: Thu Apr 19, 2012 3:32 pm 
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Maybe the arc flash boundary too since that's also important. But the drawing might become cluttered.


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PostPosted: Fri Apr 20, 2012 2:29 am 
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Joined: Thu Jul 07, 2011 6:03 am
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Location: Netherlands
See the attached image for an example (replace J/cm2 with cal/cm2 as applicable). The worst-case incident energy - separating line side, bus side and load side - and a label number that refers to your arc flash report for more information. You can remove load side calculations if you only consider the bus side. I make these to give a general impression of hazard levels and to make the IEEE 1584 results easier to navigate.

You could include all the calculation information like arcing current, clearing time, etc but in my view that's what a report is for. Just take care to clearly state on the single line when the incident energies are valid (ie worst-case for all switching scenarios except emergency operation for example).


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