Arc Flash and Etap

[Revitup]

I am new to Arc Flash and Etap
What is the difference between Bus Fault current and Bus Arcing Current within Etap?

 

[dpc]

Just a guess - arcing fault current is always less than or equal to bolted fault current. At 480 V, arcing fault current will always be significantly less than bolted fault current, due to the resistance of the arc.

 

[HRD1]

I concur with DPC; ETAP software uses IEEE1584 equations to calculate arcing fault current and incident energy for les than 15KV systems. In those equations arcing fault current equation included short circuit current as a major factor in the calculation and incident energy equation included arc flash current and fault clearing time. When you run arc flash study in ETAP it will use the short circuit current of the faulted bus to calculate the incident energy and required PPE. You need to run short circuit and coordination studies before run the arc flash study.