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| Etap Star Auto-Eval Error https://brainfiller.com/arcflashforum/viewtopic.php?f=23&t=5443 |
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| Author: | Designer82 [ Wed Apr 21, 2021 2:47 pm ] |
| Post subject: | Etap Star Auto-Eval Error |
Any experienced Etap users here understand what the heck the problem is with this Star Auto-Eval? Keeps saying "trip curve crosses" damage curve for a 20A breaker protecting 12awg cable. thanks Picture: https://ibb.co/1656NXk |
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| Author: | ewbengineering [ Thu Apr 22, 2021 1:25 pm ] |
| Post subject: | Re: Etap Star Auto-Eval Error |
Looks to me if the fault was at Bus 36, the cable would only see 1.3 kA fault current and would be OK. Now if the fault was in the cable it could see more, but at that point the cable is damaged already so would it matter? |
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| Author: | Designer82 [ Thu Apr 22, 2021 3:45 pm ] |
| Post subject: | Re: Etap Star Auto-Eval Error |
Good point. It's strange the software is showing the source fault value for this cable considering it will only ever see the load fault. |
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| Author: | bubba [ Mon Apr 26, 2021 7:51 am ] |
| Post subject: | Re: Etap Star Auto-Eval Error |
What if the fault were in the beginning of the cable run vs the end. Then the fault current will be a lot higher than 1.313kA. It might be closer to the 39kA. Then the tripping by the upstream breaker will not prevent the cable from seeing currents beyond their damage curve. I think the problem is that there is too much fault current for #12 wire. Options: increase wire size or decrease Fault Current. |
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