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Arc Flash Survey

2K views 3 replies 4 participants last post by  micromind 
#1 ·
I recently received an Arc Flash Survey with a priority 1 item due to a breaker's fault current being too low. The breaker has an interrupt rating of 65k stamped on the break, however in the survey they rate the fault current down to roughly 25,500 what causes the breakers rating to be much less than its interrupt rating. Thanks in advance. If more specifics from the survey are needed please let me know.
 
#3 ·
Is this what you are saying

1. What is the fault current at the CB per the Study?
2. The engineer derated the AIC?
3. Ask him for a justification for this.

Like John I have never heard of this and seems unless he can give a justification, a call to the CB manufacture might be in order. Manufactures frown on unwarranted actions that affect their equipment ratings
 
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