Is there a standard way of analyzing the arc flash level on the line side of a stand-alone circuit breaker, fuse, etc. Should I assume there to be a bus on the line side of the breaker?
The issue with this is that the upstream device from there would be the protective device from an arc flash event that occurs on the line side. Often a breaker or fuse just has lugs on the line side that cabling is terminating to. Should this still be an? The issue would be that a main breaker would always be categorized as a "Dangerous" category unless we can get appropriate data from the utility. The same often goes for secondary protection of a transformer, as the line side may be larger in size and does not interrupt an arcing fault very quickly. I understand a lot may depend on actual bus configuration but this can be difficult to confirm. I wasn't sure if there was a standard practice or thought process out there that would convince me otherwise from this method of analysis.
The issue with this is that the upstream device from there would be the protective device from an arc flash event that occurs on the line side. Often a breaker or fuse just has lugs on the line side that cabling is terminating to. Should this still be an? The issue would be that a main breaker would always be categorized as a "Dangerous" category unless we can get appropriate data from the utility. The same often goes for secondary protection of a transformer, as the line side may be larger in size and does not interrupt an arcing fault very quickly. I understand a lot may depend on actual bus configuration but this can be difficult to confirm. I wasn't sure if there was a standard practice or thought process out there that would convince me otherwise from this method of analysis.
