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

Selection of ground rods: What are the determining factors?

Selection of ground rods: What are the determining factors?

Selection of ground rods: What are the determining factors?

Customer has approximately (15) small "CONEX" lockers scattered on a paved lot. Each of these small storage containers have various types of commercial/industrial hazardous waste materials inside (ballasts, fluorescent lamps, empty spray paint cans, batteries, etc.} A few of these metal containers have been grounded with an individual ground per container (don't know why since there is no electrical service or electrical connections to any of these containers}. If by chance, there are requirements to ground such enclosures, how would I select the correct dimension of ground rod, i.e. 1/2" x 8' or 5/8" x 10' etc?


RE: Selection of ground rods: What are the determining factors?

I'd say they need it for lightning protection.

Your grounding should be designed to have less than 25 ohm. Obviously this varies with moisture etc. so design on the safe side, measure resistance and add rods as needed.

this depends largely on rod depths, and soil. your 10'rod could be OK. You may encounter rock less than 1-'or have very dry soil and then you need more rods or need to drill through rock.

RE: Selection of ground rods: What are the determining factors?

I suspect some of your hazardous materials might be flammable. Grounding is to help avoid static buildup. High voltage and low current mean resistance can be fairly high. I would expect the grounded containers to be marked in some way, though; so that flammable materials don't end up in the wrong container. http://armypubs.army.mil/doctrine/DR_pubs/dr_a/pdf/fm10_67_1.pdf

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