Anwar Pasha
Member
Is there a Code or standard that stipulates a time period, within which the testing of Earth Resistance for an installation must be carried out to see whether the earthing system is working or not??
HOW FREQUENTLY GROUNDING RESISTANCE NEEDS TO BE INSPECTED ??
- Thread starter Anwar Pasha
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- Location
- Placerville, CA, USA
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- Retired PV System Designer
Since the NEC does not specify any direct performance metrics for a building Ground Electrode System (GES) it also says nothing about testing.
Other industry specific codes or manuals of good practice, such as those of the utilities (the NESC) and the Communications industry (a Motorola document?), may go into performance rather than just design specifications, but I am not familiar enough with them to relate them to your question.
petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- engineer
just out of curiosity, what is it you think a earthing system does for most installations?
- Location
- Bremerton, Washington
The NEC is an installation standard, not a maintenance standard.
I have heard that the Mine Safety Administration requires ground resistance testing.
For 99% of our installations we don't care what the earth resistance is. Exceptions are for radio comm sites, and similar. The most important part of an electrical system is the bonding part and returning electrons to their source. Grounding plays no role in line to case fault.
I have heard that the Mine Safety Administration requires ground resistance testing.
For 99% of our installations we don't care what the earth resistance is. Exceptions are for radio comm sites, and similar. The most important part of an electrical system is the bonding part and returning electrons to their source. Grounding plays no role in line to case fault.
RumRunner
Senior Member
- Location
- SCV Ca, USA
- Occupation
- Retired EE
Just curious.
How do you quantify performance of a grounding system?
I have worked on grounding systems on radar stations where all metal structural members in contact with earth have exo- welded wires that are tied together and buried.
Along with these wires a copper sheet ~12 inches wide are also buried along the perimeter of the building. . . usually those geodesic-shaped buildings that look like half a golf ball atop a high point.
I've never been sent back to take readings to check ground resistance later.
You posted your question on the wrong type of forum.
Your answers are found in the IEEE Green Book.
Here is good white paper on Earth grounding that may help you in finding the answers to your questions.
http://www.cpccorp.com/deep.htm
.
romex jockey
Senior Member
- Location
- Vermont
- Occupation
- electrician
electrofelon
Senior Member
- Location
- Cherry Valley NY, Seattle, WA
I know them. Another one of these scam "grounding expert" companies. Nothing but nonsense. I read one of their case studies a while back. They fixed a few very basic things with bonding jumpers, the GEC and electrodes, installed some surge protection AND did all this deep earth stuff. the client didnt have any more trouble. Must be the deep earth grounding :roll:
- Occupation
- Licensed Electrician
How important is that in relationship to the triangle?
electrofelon
Senior Member
- Location
- Cherry Valley NY, Seattle, WA
Obviously three deep earth electrodes in a triangle offers the most complete protection for personnel and equipment :roll:
RumRunner
Senior Member
- Location
- SCV Ca, USA
- Occupation
- Retired EE
Do you really believe that nonsense and being a scam?
Since you are (obviously)
one of those non-believers, albeit insulting , why do companies pay grounding engineer specialists over a $100,000 a year salary.
Do you make over 100K/year wearing a pouch with Klein's and screwdriver?
If not, and you are moonlighting as a PE that knows more about grounding and your take home pay doesn't come close to100K, there is an opening for experts like you at: Sandia National Laboratory in Livermore CA. A research lab.
Give it a shot and show us what you got.
As a footnote: give them respect, it will make you look good--and this site as well.
- Occupation
- Licensed Electrician
I don't believe all of it is a scam, but I have seen some very smart people approach a grounding system with an almost religious fervor detached for any reality, Dirt Worshipers I call them.
For instance requiring a ground rod next to a street light that has concrete base ten feet in the ground. Most of things like this are engineer specced and it's flat foolish.
electrofelon
Senior Member
- Location
- Cherry Valley NY, Seattle, WA
Have you read the page linked to in post #6?
- Occupation
- Licensed Electrician
I didn't till you re-mentioned it. I'd laugh out loud it I wasn't so disgusted by this mentality.
They left out the part where you need to sprinkle the blood of virginal forest animals over the ground rod location to fully activate the magic of the deep driven ground rods.
I'd love to hear Brian John's take on this. He goes toe to toe with these type of whackos.
RumRunner
Senior Member
- Location
- SCV Ca, USA
- Occupation
- Retired EE
How could anyone dismiss it as a scam. People who patronize these services are like you and me . . . those who can not be easily scammed by those guys that you label as snake oil traveling merchant.
The little old lady living alone in a small hut, would have no use for grounding experts. This little old lady who knows nothing about grounding , would be the most vulnerable victim of this snake oil vendor. . . not us.
The little old lady living alone in a small hut, would have no use for grounding experts. This little old lady who knows nothing about grounding , would be the most vulnerable victim of this snake oil vendor. . . not us.
Pretty much.
Foolish I guess.
My salary didn't include wearing a pouch.
They're to late, I'm retired.
Now, do you agree with what they say here?
limits voltage in a electrical distribution system to definite fixed values limits voltage to within insulation ratings provides a more stable system with a minimum of transient over voltage and electrical noise provides a path to ground in fault conditions for quick isolation of equipment with operation of ground fault protection provides grounding of all conductive enclosures that may be touched by personnel, thereby eliminating shock hazards reduces static electricity that may be generated within facilities
Roger
kwired
Electron manager
- Location
- NE Nebraska
I did not go to any links posted, I will say there often is too much emphasis put on "earthing", especially on the average home or place of business.
Not saying there isn't occasions where it is more important those are usually more industrial type applications though, but even some of those cases they maybe get more concerned then they need to.
- Occupation
- Licensed Electrician
I think what myspark is saying is that if you can identify and correct simple wiring wiring problems while at the same time come up with an outrageous plan for earthing systems you can make a hundred grand a year instead of the piddily sum you make as an honest electrician.
RumRunner
Senior Member
- Location
- SCV Ca, USA
- Occupation
- Retired EE
All of what you said define the quintessential curmudgeon that only give a bad image to a place where learners go for advice and hopefully get something they can use for the rest of their life.
Perhaps if you tone down your narcissistic rhetoric, learners will even consider your words as something that carry a shade of credibility.
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