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For motors that can contribute short circuit current, do you:
Include all motors 50 hp and greater 31%  31%  [ 21 ]
Include all motors regardless of hp rating 55%  55%  [ 37 ]
Something else 13%  13%  [ 9 ]
Total votes : 67
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Jim Phillips (brainfiller)
 Post subject: Motor Contribution and Arc Flash Studies
PostPosted: Sun Jul 17, 2011 3:23 pm 
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Joined: Mon Sep 17, 2007 5:00 pm
Posts: 1736
Location: Scottsdale, Arizona
When performing an Arc Flash Hazard Calculation Study, IEEE 1584 suggests including all motors 50 hp (37 kW) and larger in the model to account for motor short circuit current contribution.

For motors that can contribute short circuit current, do you:
  • Include all motors 50 hp and greater
  • Include all motors regardless of hp rating
  • Something else

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JBD
 Post subject:
PostPosted: Mon Jul 18, 2011 8:34 am 
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Joined: Mon Jan 18, 2010 11:35 am
Posts: 609
Location: Wisconsin
We include motors greater than 50HP, but we also run arc flash scenarios with no motors running.
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David S.
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PostPosted: Tue Jul 19, 2011 9:28 am 

Joined: Fri Jun 17, 2011 3:18 am
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Location: PA
We typically use SKM to calculate Arc Flash values. Since SKM has the ability to calculate all motor faults, we use it; it is more conservative than only considering >50hp motors.
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joebell
 Post subject:
PostPosted: Sun Jul 24, 2011 5:58 am 

Joined: Sat Jul 12, 2008 11:11 am
Posts: 10
Location: New Hampshire
Why does IEEE 1584 suggest all 50 hp motors and larger be included ? Would 2 25 hp motors add the same contribution?
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