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Jim Phillips (brainfiller)
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Post subject: 85% Arcing Current  Posted: Sun Apr 17, 2011 5:52 pm |
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Joined: Mon Sep 17, 2007 5:00 pm
Posts: 1736
Location: Scottsdale, Arizona
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IEEE 1584 suggests that an additional incident energy calculation should be performed using 85% of the arcing current for systems less than 1000 volts. This is to determine if the upstream protective device will still trip instantaneously during an arc flash.
Do you use the 85% value as part of your calculations?
Yes - we use 85% as well as 100%
No - we only use 100%
Other - we use a value other than 85%
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Jim Phillips, P.E.
Brainfiller.com
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jimmorton
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Post subject: Posted: Wed Jun 01, 2011 11:16 am |
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Joined: Sat Nov 20, 2010 10:17 am
Posts: 13
Location: Victoria British Columbia
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Yes - we use 85% as well as 100% .
We are mostly concerned with low voltage 450 Volt used on Navy ships. It has made significant diferences in some cases. 27 Cal/cm² vice 8
Jim
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