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Arc-flash on Grounded-B system

Arc-flash on Grounded-B system

Arc-flash on Grounded-B system

(OP)
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!

RE: Arc-flash on Grounded-B system

SJB

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

RE: Arc-flash on Grounded-B system

(OP)
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?

RE: Arc-flash on Grounded-B system

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

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