Arc Flash Min and Max Utility Fault Values

[pistola2]

Hi. I wish to understand more about how the utility contribution to an arc flash calculation is done. Do you require the utility to supply both maximum and minimum fault values to help define the min and max arcing current? If so, which values? 3-phase only or single line to ground (or both)? I think the IEEE standard only talks about 3-phase values. thank you

 

[alehman]

Yes, both if you can get it. 3-phase only. Also try searching here for other threads on this topic.

Alan
“The engineer's first problem in any design situation is to discover what the problem really is.” Unk.