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What is the maximum number of DIFFERENT arc flash labels that are on any piece fo equipment?
None (so far)
1
2
3 or more
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 Post subject: Maximum Number of Arc Flash Warning Labels on Equipment
PostPosted: Sun Sep 23, 2012 3:39 am 
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Joined: Mon Sep 17, 2007 5:00 pm
Posts: 1637
Location: Scottsdale, Arizona
Many arc flash studies are performed using different operating scenarios which produce different results. Also, some equipment such as switchgear will sometimes have multiple arc flash calculations. This may include one case for the incoming main using the upstream protective device clearing time and separate calculations for the feeders using the main device's clearing time. Some will use one label with the worst case or normal case results while others may use multiple labels.

This week's question:

What is the maximum number of DIFFERENT arc flash warning labels that your company / client has on any piece of equipment?
  • None (so far)
  • 1
  • 2
  • 3 or more

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Jim Phillips, P.E.
Brainfiller.com


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PostPosted: Mon Sep 24, 2012 8:44 am 
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Joined: Mon Jan 24, 2011 11:25 am
Posts: 38
Location: richmond, VA
We run many scenarios, but try very hard to put one label on each piece of equipment showing the worst case arc flash hazard.


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PostPosted: Mon Sep 24, 2012 6:49 pm 
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Joined: Thu Oct 18, 2007 7:10 pm
Posts: 263
Location: NW USA
We also run multiple scenarios to develop the worst case exposure, that gets posted on the equipment.

However; for one customer the equipment simply could not be shut down, and it required specific configuration to achieve workable calculated arc flash exposure. In that case we posted labels with the highest exposure (unworkable) but also referenced a specific table we put together with standard configurations/ arc flash exposure. It was complicated, however; a very sharp crew that seemed to understand what they were looking for.


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PostPosted: Tue Sep 25, 2012 10:14 am 
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Joined: Fri Apr 27, 2012 6:49 am
Posts: 40
1. Generic label from manufacturer stating that there is an AF hazard (placed on all new equipment)
2. AF hazard label with specific incident energy at the standard working distance
3. AF hazard label at unusual working distance [url='http://www.arcflashforum.com/threads/2343/'](see this post:[/url][url='http://www.arcflashforum.com/threads/2343/']http://www.arcflashforum.com/threads/2343[/url]/)


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PostPosted: Fri Sep 28, 2012 9:11 am 

Joined: Sun Jul 29, 2007 1:35 pm
Posts: 7
So far we've managed to keep it pretty simple. Typically only one label for most equipment. Worst (reasonable) case hasn't been much worse than the normal case.
We do use 2 labels on switchgear 1 for the main and 1 for the feeders.


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