Range of MVA and X/R

[wbd]

Hello,

has anyone seen a document that would have the typical 3 phase fault MVA and X/R values for industrial complexes at the 480V level?

Thank you

 

[alehman]

It varies tremendously. 480V fault current ranges from less than 10,000 A to over 100,000 A. X/R can range from 1.5 to 10.

If you can provide more specifics, the answer might be refined.

 

[JBinCA]

The local utility here gives us the same values for any 480 service in the area of particular ampacity, which is obviously not a calculated value.

Youre utility may do the same thing, in which case a quick call to their engineers might answer your question.

Regards,

JB

 

[dpc]

It's really going to be basically a function of the serving transformer, so the MVA will vary quite a bit.