Contact US

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!

*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

Ground Riser Termination to I-beam

Ground Riser Termination to I-beam

Ground Riser Termination to I-beam

Hello forum members, please find the attached pic showing a ground riser termination a contractor made to an I-beam. It's understood this ideally would be a cadwelded connection but my question is related to them utilizing the same hole for the conduit strap as they did for the ground cable lug. There's alot wrong with this but could someone direct to the section of the Code that doesn't allow this.

RE: Ground Riser Termination to I-beam

Can't see further up the picture than what was posted but if a bolted pressure connection is permitted I don't see an issue (assuming the two copper conductor shown are the same wire. Not how I'd do it, but it saved drilling a second hole, that's got to be worth something, right? Desirable installations and code compliant installations intersect to a certain extent, but the universe of code compliant installations is larger than what I'd consider desirable.

I’ll see your silver lining and raise you two black clouds. - Protection Operations

RE: Ground Riser Termination to I-beam

If the intent of the conduit clip is to connect the second copper cable to the conduit, I doubt the connection is good enough to meet NFPA 780 code intent. Is this connection to meet NFPA 70 (Electric code bonding), NFPA 780 (lightning), both?

RE: Ground Riser Termination to I-beam

Basically, the connection has to be a listed connection device, which this is not. There are plenty of UL-listed connectors for bonding to steel beam flanges. Check Erico catalog or website. If this is under the NEC, see 110.2 and 250.8.


RE: Ground Riser Termination to I-beam

The paint covering does not seem to have been removed from the beam.
I would prefer to see a cadmium bronze bolt.

Ohm's law
Not just a good idea;
It's the LAW!

RE: Ground Riser Termination to I-beam

Thanks folks. I definitely wouldn't have done it this way either. This certainly is another example of a contractor taking the easy way out. This is a new facility bound by the NEC. After I posted my question, I found something in the project installation specs that prohibit this as well.

RE: Ground Riser Termination to I-beam

Thanks waross. Agreed on the paint. This is a violation of NEC 250.12 and just common sense. I'm old-school and like exothermic welded connections but where bolting is allowed and utilized, I prefer class 2 stainless steel bolting hardware.

RE: Ground Riser Termination to I-beam

I like cadmium bronze. Galvanized is available as a second or third choice when cadmium bronze is not available.
I haven't seen stainless hardware but I am OK with stainless bolts.

Ohm's law
Not just a good idea;
It's the LAW!

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! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

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