×
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

bracing rating

bracing rating

bracing rating

(OP)
What is bus bracing rating?

RE: bracing rating

Bus must be able to withstand the maximum amount short circuit current available in the given application. They must be braced to withstand that.

Good luck on your finals.

Cheers
Scott

Ps: google, over a million hits in 1.41 seconds

I really am a good egg, I'm just a little scrambled!

RE: bracing rating

More specifically it must be braced to withstand the initial peak short circuit current. If it survives the peak when the magnetic forces are most powerful it will almost always survive the sustained short.
  

----------------------------------
  
If we learn from our mistakes I'm getting a great education!
 

RE: bracing rating

There are not a general bus bracing rating as far as I know.
This need to be calculated for specific cases and design configuration.
In addition to SC, other horizontal forces should be considered (ie max. wind speed, seismic forces, etc)
Often insulators strength is the critical factor to withstand a particular loading scenario.
Check the IEEE STD 605 or similar guide for bus bracing calc.

RE: bracing rating

Just a pedantic clarification.

Bus bracing is not to withstand the CURRENT, it's actually to withstand the MECHANICAL FORCES that will be created by the extreme magnetic field repulsion between bus bars under fault current conditions. But to the original points, it is usually expressed as a current value because the magnetic forces are pretty well understood and that's what really matters. So when a piece of gear says the "Bus Bracing = 42kA", that is saying that the insulating support structure for the bus bars will survive the mechanical repulsion forces expressed between the bus bars during a fault with a magnitude of 42,000 amperes.

"Dear future generations: Please accept our apologies. We were rolling drunk on petroleum."
— Kilgore Trout (via Kurt Vonnegut)
  
For the best use of Eng-Tips, please click here -> FAQ731-376: Eng-Tips.com Forum Policies  

RE: bracing rating

(OP)
Thank you guys for responding!!!

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