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| Short Circuit Calculations: ANSI/IEEE or IEC https://brainfiller.com/arcflashforum/viewtopic.php?f=33&t=5171 |
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| Author: | Jim Phillips (brainfiller) [ Sun Sep 15, 2019 12:47 am ] |
| Post subject: | Short Circuit Calculations: ANSI/IEEE or IEC |
I just arrived in Geneva, Switzerland for IEC meetings which prompted this week's question. It is about IEC vs. ANSI/IEEE Standards for short circuit current calculations. Depending on which method is used, the results can vary a bit which may also affect the calculated incident energy. Here is this week's question: Which short circuit calculation method do you use? ANSI/IEEE IEC Both Other (please describe) I Don't Perform Studies |
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| Author: | arcad [ Sun Sep 15, 2019 7:41 pm ] |
| Post subject: | Re: Short Circuit Calculations: ANSI/IEEE or IEC |
Jim Phillips (brainfiller) wrote: I just arrived in Geneva, Switzerland for IEC meetings which prompted this week's question. It is about IEC vs. ANSI/IEEE Standards for short circuit current calculations. Depending on which method is used, the results can vary a bit which may also affect the calculated incident energy. Here is this week's question: Which short circuit calculation method do you use? ANSI/IEEE IEC Both Other (please describe) I Don't Perform Studies I prefer comprehensive method factoring in all the equipment active, reactive impedance and contribution to fault current. Also, I find it important to know the range of available fault current (min - max) and take into account arc duration so I can identify worst case arc flash scenario. Incident energy alone is meaningless unless you know how fast that energy has been delivered. Jim, let me know please if I can be of any help elaborating on or escalating this issue to decision making authorities. |
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