Smart questions
Smart answers
Smart people
Join Eng-Tips Forums

Member Login

Remember Me
Forgot Password?
Join Us!

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips now!
  • 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!

Join Eng-Tips
*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.
Jobs from Indeed

Link To This Forum!

Partner Button
Add Stickiness To Your Site By Linking To This Professionally Managed Technical Forum.
Just copy and paste the
code below into your site.

amptramp (Electrical) (OP)
23 Feb 04 17:11
Does anyone know where I can find (on the Internet) ampacity tables for aluminum busbar?
busbar (Electrical)
24 Feb 04 20:48

Maybe this will do.  NEC 374-6 For aluminum bars, the current carried continuously shall not exceed 700 amperes/in.² of cross section of the conductor.
amptramp (Electrical) (OP)
25 Feb 04 9:36

Thanks for the response. I am specifically seeking current ratings (ampacities) of rectangular aluminum bar of a 6101 alloy (electrical grade aluminum). The tables specify size (1/4" x "x", 1/2" x "x", etc.), orientation (horizontal or vertical mount), number of parallel bars, and alloy versus current ratings. Alcoa used to publish a handbook with tables such as I am seeking; however, I do not have a handbook and Alcoa can't seem to locate one.

P.S. I could not locate the code section quote you listed in the 2002 NEC. Did you make a typo or am I looking in the wrong section?
Helpful Member!  BJC (Electrical)
25 Feb 04 10:39
Try this, IT's the onlline version of the "Technical Data- A reference for the Electrical Power Industry".  It's worth downloading and sticking on a CD.
busbar (Electrical)
25 Feb 04 20:10

amptramp, it was a basic rule of thumb from the 1999 NEC.  Looks like you need more detail.  

BJC suggested a much more detailed reference.
amptramp (Electrical) (OP)
26 Feb 04 10:48
I found this guide which shows how to calculate the current rating. I ran a couple size variations and the results were close to the tables I have. All the tables I have found stop at 1/2" thick bar.
SteveSmith (Mechanical)
1 Mar 04 13:12

Steve Smith, C.I.D.
Product Engineer
Staco Energy Products Co.

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!

Back To Forum

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close