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| Largest Arc Flash Boundary https://brainfiller.com/arcflashforum/viewtopic.php?f=33&t=4395 |
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| Author: | Jim Phillips (brainfiller) [ Sun Jul 23, 2017 12:54 pm ] |
| Post subject: | Largest Arc Flash Boundary |
Last week’s question was about large incident energy calculation and this week’s question parallels that theme. It is about large calculated arc flash boundaries. Of course, actions such as using a 2 second cut off, adding arc energy reduction methods etc. can reduce the boundary but without those actions: What is the largest calculated Arc Flash Boundary that you have seen? Less than 10 feet (3 meters) Between 10 feet (3 meters) and 30 feet (9 meters) Greater than 30 feet (9 meters) – How large was it? |
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| Author: | Doug Powell [ Mon Jul 24, 2017 1:33 pm ] |
| Post subject: | Re: Largest Arc Flash Boundary |
Recently calculated a 19' boundary based on a 13.8kV/480V, 3PH, 800 kW transformer. Incident energy at the working standard distance for a panelboards was quite high and exceeded the 40 cal/cm2 limit. I did factor a 16' cable run and probably should increase that by quite a bit more. I am not certain how to calculate complex impedance for 3PH direct bury. Think you could do a blog post on that someday and include number of conductors for each phase? ~ Doug |
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