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timandjen94
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Post subject: extraction time in arc flash studies  Posted: Wed May 01, 2019 12:52 pm |
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Joined: Wed May 01, 2019 12:47 pm
Posts: 1
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I am interested to know if there is a standard amount of time to use for arc duration when taking consideration worker extraction.
I have heard the time 2 seconds in the past. I would love to get your thoughts.
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Jim Phillips (brainfiller)
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Post subject: Re: extraction time in arc flash studies Posted: Mon May 20, 2019 9:24 am |
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Joined: Mon Sep 17, 2007 5:00 pm
Posts: 1736
Location: Scottsdale, Arizona
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The two methods that are used for the arc flash duration are the clearing time of an upstream protective device or a 2 second cut off if it is feasible for a person to escape/jump back. There isn't anything regarding extraction time.
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Reeberas
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Post subject: Re: extraction time in arc flash studies Posted: Thu May 23, 2019 6:32 am |
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Joined: Mon Apr 06, 2015 9:51 am
Posts: 7
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I have seen the discussion about the 2 second rule. However, if your workplace population is older and working on the bottom unit of an MCC you might be sitting on the floor, I suspect there are some people who will not have significantly moved in the two seconds. If the hazard is large because a breaker isn't tripping in the two seconds, you might want to look at the settings and sizing and see if you can lower the hazard.
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