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arcflashprimero
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Post subject: arcing fault vs arcing fault through protective device  Posted: Tue Apr 14, 2026 3:35 am |
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Joined: Thu Dec 18, 2025 3:21 pm
Posts: 17
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When running my arc flash study, in the table it shows an arcing fault of 5ka, but incident energy is high because trip time is over 2 seconds. When I look at the protective device the INST setting is below 5kA. I thought the breaker would trip but it doesnt. After looking further into it the I see that the protective device arcing fault is 2kA. How can these be different? If the downstream bus sees 5kA then why doesnt the upstream protective device see this?
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