×
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

Touch Potential

Touch Potential

Touch Potential

(OP)

Guys,
What is your suggestion for decreasing the touch potential on the pump room (lower right)?
I have 4 ground rods (one in each corner of the the room) and it still shows a high touch potential.
I have added lots of copper and rods on other parts of the grid and adding more, looks a little bit out of budget and questionable.

An investment in knowledge pays the best interest (Benjamin Franklin).
www.kookypedia.com

RE: Touch Potential

Ground the piping metallic structures and reinforced concrete rebar of the pump station floor.
Made sure rebar, underground metallic structure and concrete resistivity are represented properly in the grounding model.
Usually, the result output of programs for the area covered with concrete & rebar result in a quasi_equipotential zone

RE: Touch Potential

(OP)
Thanks,
After talking with CDEGS, I just modeled rebars (not concrete) and it solved the problem.

An investment in knowledge pays the best interest (Benjamin Franklin).
www.kookypedia.com

RE: Touch Potential

For your consideration, a typical surfacingt resistivity of the station with crushed rock usually is around 3000 Ohm.m. However, the concrete resistivity is around 30 to 100 Ohm.m.
Therefore, the allowable step and touch potentials for bother surface are very different and should be checked accordingly. Because the quasi-equipotential area as a result of founding the rebar should not be expected problem in this his matter.
Will be the responsibility of the engineer to properly calculate that and prepare a safety assessment for this installation

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