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| Arc Flash and Current Limiting Fuses/Breakers https://brainfiller.com/arcflashforum/viewtopic.php?f=33&t=2767 |
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| Author: | Jim Phillips (brainfiller) [ Sun May 19, 2013 11:40 am ] |
| Post subject: | Arc Flash and Current Limiting Fuses/Breakers |
Has your company or client added any current limiting fuses /circuit breakers as a result of an arc flash study?
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| Author: | JBD [ Mon May 20, 2013 7:11 am ] |
| Post subject: | |
Yes and no. It all depends on the situation. If the arcing fault current is not sufficient to cause the fuse to enter its current limiting range, then we have gone so far as to recommend the fuse be replaced with a breaker. If the fault is sufficiently high then we evaluate the fuse in the the context of installed cost. IMHO, generally it depends on the fuse curve, not whether it is current limiting or not. |
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| Author: | A King [ Mon May 20, 2013 8:16 am ] |
| Post subject: | |
Added additional fuses, no. However, we've changed our stock inventory from RK5 to RK1 fuses. Where indicated by the arc flash hazard analysis we've replaced some of these older fused up in bus plugs to reduce the IE at the equipment panel on the floor. |
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| Author: | Gary B [ Mon May 20, 2013 8:24 am ] |
| Post subject: | |
No and yes: The question states "current limiting fuses" which is a specific category we have not installed as part of arc flash mitigation. We have; however, changed many fuse types and circuit breaker instantaneous settings to clear quickly on arcing fault current. So rather than limiting the current magnitude, we have limited it's duration. |
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