Touch Potential

[kookypedia]

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).

http://www.kookypedia.com

 

[cuky2000]

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

 

[kookypedia]

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).

http://www.kookypedia.com

 

[cuky2000]

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