×
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

Bus bar bracing
2

Bus bar bracing

Bus bar bracing

(OP)
Can anyone help me with bus bar spacing for different kA bracing? I have a spread sheet with formulas but it seems way over kill. I thought that 21" between insulators was capable to withstand 65 kA but me table says it should 7" for single 1/4" x 4" bus!

Thanks,

RE: Bus bar bracing

D'oh! Sorry.
You said spacing and bracing in the same sentence, I only saw spacing. Bracing is a differnt matter. Disregard that paper as far as that is concerned.

Try these.
ANSI/IEEE Std. C37.20 Switchgear Assemblies Including Metal-Enclosed Bus
ANSI/IEEE Std. C37.23 for Metal-Enclosed Bus

Eng-Tips: Help for your job, not for your homework  Read FAQ731-376

RE: Bus bar bracing

(OP)

where did I goe wrong? I braced the bus bar on about 2 feet intervals meaning supported to  frame front and back. I was referring to the distance between insulators. Most of our applications are low voltage, 480 down. The question is: Is there a table (other than the one I have) that will give me insulator centers based on bus sizes and spacing between buses edge up?

RE: Bus bar bracing

2
See UL 891 Supplement B.

It has a chart for between 42K & 100K, Max 4000A.

Example:800A-4000A, 65,000 @ 480V, bars edge-edge, min. 1" bar to bar, min. 5" center to center, 21" between supports.

Example:800A-4000A, 65,000 @ 480V, bars face-face, min. 4" bar to bar, min. 6" center to center, 48" between supports, 21" between braces.

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