×
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

Cable sizing for delta configuration

Cable sizing for delta configuration

Cable sizing for delta configuration

(OP)
This is a hypothetical question and is based on thread238-246755: 3Ø Amps Per Ø. There it was established that the rating (amperage wise) of a transformer secondary was meant to be interpreted as being 600A in each phase or line.

Say for a moment, that this transformer was a delta-wye, 500 kVA, and is connected to a 2400 switchgear supply breaker. If the primary is a delta configuration, can I say that the line current  is SQRT 3 x 120.3A x 1.25% to properly size the cable size, disregarding for the moment other variables such as being in a duct bank or in a conduit exposed to the sun, etc?

Would appreciate any response as I am somewhat grey when it applies to a delta feeder.
 

RE: Cable sizing for delta configuration

500,000 VA / 2400 Volts / 1.73 = 120.3 Amps per phase. The Amps per winding will be less but that does not concern feeder sizing.

Bill
--------------------
"Why not the best?"
Jimmy Carter

RE: Cable sizing for delta configuration

(OP)
Thank you waross for your input. I appreciate your time.

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