# Thread: HOW FREQUENTLY GROUNDING RESISTANCE NEEDS TO BE INSPECTED ??

1. Also note that forming an equipotential grid for step and touch potentials like in swimming pools and substations isn't about earthing and ground resistance . It's really a totally different thing.

2. Senior Member
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Feb 2018
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Originally Posted by ActionDave
What does that have to do with low voltage systems?
Please reread post #37. What did post #37 have to do with low voltage systems? My post #39 was meant only as an added informational note for substations. Though in the broader context I suggested to pay attention to touch as well as step potentials.

In low voltage systems do you think touch and step potentials could be an issue? Example, the differences where the earth grounding electrode system resistance is 25 ohms compared to 5 ohms?

Just curious what does your statement in post #34 have to do with low voltage systems for the purposes of the OPs original posted message?
Somewhere there is a scientist working at the South Pole with some sensitive electronic equipment. How deep is his ground rod?

What about the Navy submarines? How do they manage?
You forgot airplanes.....

If you want answers to these questions you should start your own thread. I would then be glad to post an answer.

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3. Originally Posted by Jamesco

In low voltage systems do you think touch and step potentials could be an issue? Example, the differences where the earth grounding electrode system resistance is 25 ohms compared to 5 ohms?

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Low system earth resistance will not help with step and touch potentials. You cant "out earth" your way out of step and touch potentials. The only way to do that is with a equipotential grid.

4. Originally Posted by Jamesco
In low voltage systems do you think touch and step potentials could be an issue? Example, the differences where the earth grounding electrode system resistance is 25 ohms compared to 5 ohms?
I think the difference between 25 ohms and 5 ohms is of no value at all in a low voltage system.

5. Originally Posted by ActionDave
I think the difference between 25 ohms and 5 ohms is of no value at all in a low voltage system.
I think the key thing to realize is you can't bond the earth. I don't think we would gain anything even with, say, a super low .25 ohm resistance. You only can "bond " the dirt within a few feet of the electrode. Go to great lengths to get a low resistance, and unfortunately you have to do it all over again once you move a few feet away.

6. Originally Posted by electrofelon
I think the key thing to realize is you can't bond the earth. I don't think we would gain anything even with, say, a super low .25 ohm resistance. You only can "bond " the dirt within a few feet of the electrode. Go to great lengths to get a low resistance, and unfortunately you have to do it all over again once you move a few feet away.
I think of Dirt Worshipers like the aliens it Toy Story,

only they all chant "The Ground" instead of "The Claw".

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