| Arc Flash Forum https://brainfiller.com/arcflashforum/ |
|
| extraction time in arc flash studies https://brainfiller.com/arcflashforum/viewtopic.php?f=33&t=5003 |
Page 1 of 1 |
| Author: | timandjen94 [ Wed May 01, 2019 12:52 pm ] |
| Post subject: | extraction time in arc flash studies |
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. |
|
| Author: | Jim Phillips (brainfiller) [ Mon May 20, 2019 9:24 am ] |
| Post subject: | Re: extraction time in arc flash studies |
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. |
|
| Author: | Reeberas [ Thu May 23, 2019 6:32 am ] |
| Post subject: | Re: extraction time in arc flash studies |
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. |
|
| Page 1 of 1 | All times are UTC - 7 hours |
| Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group http://www.phpbb.com/ |
|