Arc-flash on Grounded-B system

[SJBatTCE]

Anyone have suggestions for conducting an arc-flash study on a 480V, three-wire, grounded-b system? Is this possible? If so, should it be treated as an ungrounded-delta? Not sure where to start with this one... TIA!

 

[jschwei314]

SJB

One has a grounded system. Use the grounded fudge factor. Treat it as any other grounded 480 volt system.

 

[SJBatTCE]

That's what I'm inclined to do here. My arc-flash numbers will be quite conservative as there will be only two phases contributing to the fault, correct?

 

[davidbeach]

Nope, it will be a three-phase fault, just like any other arc-flash event.