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Do you use the IEEE 85% value in your calculations?
Yes - we also use 85%
No - we 100% of arcing current only
Other - we use a value other than 85%
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 Post subject: 85% Arcing Current
PostPosted: Sun Apr 17, 2011 5:52 pm 
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Joined: Mon Sep 17, 2007 5:00 pm
Posts: 1635
Location: Scottsdale, Arizona
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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PostPosted: Wed Jun 01, 2011 11:16 am 

Joined: Sat Nov 20, 2010 10:17 am
Posts: 13
Location: Victoria British Columbia
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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