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.


Load Break Switch Grounding and Inspection Best Practice

Load Break Switch Grounding and Inspection Best Practice

Hi Folks,
  I am at an electric utility and an item that has continued to come up at our Union Labor Management meetings is if we are doing adequate initial grounding testing and adequate annual inspections of Load Break Switches.    I would be very interested to hear what people do for initial grounding testing, as well as follow up inspections.    We currently build a 4/0 ground grid with 4 driven ground rods, then perform ground step potential tests.   Thanks in advance for any info.

RE: Load Break Switch Grounding and Inspection Best Practice

At what voltage levels?  Do you model the GPR of the switch grounding installation?  Switch grate (steel grid bonded to the ground which the operator stands on when operating the switch)?  Gloves can insulate the operator if rated for the exposure (distribution voltage levels) whereas transmission voltages need supplemental protection (equipotential zone).

RE: Load Break Switch Grounding and Inspection Best Practice

apower,  The voltages range from 12KV to 34KV distribution.  Often times we can not use switch grates do to the location, i.e. in town sidewalks, mowed lawn. On the transmission and especially in subs, we use the grates. The field personnell always wear gloves when operating switches, so the issue is mainly a step potential issue. We do not model GPR currently, (do you mean with software?)  


RE: Load Break Switch Grounding and Inspection Best Practice

Consider portable gradient control mats. These perform the same function as a grate.
The ground conductors are connected to the switch handle. In the event of elevated potentials on the switch handle the workers feet will be held at the same potential as his hand.

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!


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