×
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

Lightning Protection-Ball Field

Lightning Protection-Ball Field

Lightning Protection-Ball Field

(OP)
I'm working on the design of a service for lights at a ball field.  The poles are concrete and will be 70ft above ground level. The pole has a bare Cu. wire encased in the concrete and bonded to the lights supports.  My questions are:
 1. Should I terminate the bare Cu. wire at the bottom of the pole to a 10' ground rod and that's all the lightning portection or,
2. Should I run a ground loop back to the service.
3. Should I bond the fence/metal structures when close to the pole, to avoid any flashover?

Any comments will be appreciated.

Thanks

RE: Lightning Protection-Ball Field

There should be an equipment grounding conductor (EGC) run with the branch circuit to get fault current back to the service.  The ground rod is a good idea for lightning, but cannot take the place of an EGC.

NFPA 780 has methods to determine if bonding is required to avoid flashover.  It depends on the height of the metal structure and the distance from the down conductor.  

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