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ekstra   ara
McFlash
 Post subject: DC Arc Flash Boundary
PostPosted: Thu Jun 28, 2012 9:06 am 
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Location: Cincinnat, OH
OK, Either I am searching for the wrong terms Or there really have not been any posts regarding this topic. Looking to perform a DC arc flash calculation for someone using Annex D in the 2012 70E but I don't find any mention about the arc flash boundary. I am thinking that I could use the IE to back calculate the equivalent boundary but am not sure. Any comments or guidance would be great.
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Vincent B.
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PostPosted: Thu Jun 28, 2012 11:02 am 
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The definition of the AFB is where the IE is 5 J/cm^2 for systems 50 V and greater (see 130.5(A)). So yes, you can backcalculate it. The same is done in D.7.5, except the equation is explicit.
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lsilecky
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PostPosted: Mon Jul 09, 2012 8:31 am 

Joined: Tue May 22, 2012 7:04 am
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Location: Mississauga, Ontario
You can also try CSA Z462-12 Annex D Table D.5 and pages 102 and 103.
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Vincent B.
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PostPosted: Mon Jul 09, 2012 8:43 am 
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lsilecky wrote:
You can also try CSA Z462-12 Annex D Table D.5 and pages 102 and 103.

That's for AC, not DC. Only D.8 is about DC, and it's not explicit how to calculate the AFB for DC.
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arcad
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PostPosted: Thu Jul 12, 2012 7:23 am 
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check please this forum thread http://www.arcflashforum.com/threads/2332/ on how to calculate DC arc flash boundary.

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