×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Range of MVA and X/R

Range of MVA and X/R

Range of MVA and X/R

(OP)
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

RE: Range of MVA and X/R

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.

RE: Range of MVA and X/R

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

RE: Range of MVA and X/R

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

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources