Truck loading station
- Thread starter Pinedale
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- Illinois
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- retired electrician
It is not designed for that purpose. It is designed to measure the resistance of a grounding electrode.
- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
Are these ground leads supposed to be hard wired in parallel to a system ground electrode set? If so, just use an ohmmeter to verify conductivity.
If each lead connects to its own independent rod, then you would have to use a properly set up ground resistance tester.
An ohmmeter check of 2 and 3 will probably indicate open wires, but if the lead is just for static discharge even 1Megohm will do the job.
I am doing my research now on grounding services cause nyc is getting more strict on it. In 2008 videos Mike Holt says that he could not have tested his son's well casing grounding using clamp on tester cause there was no electric service brought to it. That is your case, right?
As Don stated the tool is designed to test grounding electrodes end it needs electric utility neutral wire to perform a test.
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Or change batteries in tester ....
As Don stated the tool is designed to test grounding electrodes end it needs electric utility neutral wire to perform a test.
....
Or change batteries in tester ....Attachments
- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
I am doing my research now on grounding services cause nyc is getting more strict on it. In 2008 videos Mike Holt says that he could not have tested his son's well casing grounding using clamp on tester cause there was no electric service brought to it. That is your case, right?
As Don stated the tool is designed to test grounding electrodes end it needs electric utility neutral wire to perform a test.
....
Allow me to clarify that a little (since the illustration does not really make it clear):
The clamp on meter uses the clamp as a current transformer to inject a measured current into the wire, which requires that both ends be connected to something so that current can flow!
Ideally the top side of the wire that goes through the clamp is connected to the other electrodes of a distributed ground system, the grounded utility neutral, or a separate ground rod installed just for the test.
With that known current injected, you measure the voltage between the wire below the clamp and some acceptable earth reference which is NOT carrying current.
If you go to the Fluke website and look at their clamp type ground electrode tester, you will find much more detailed drawings and a good, accurate explanation.
The description in the graphic of "measuring the strength of the return signal" implies that it is some sort of totally contactless test which is doing Time Delay Reflectometry. As far as I know there are no ground resistance measuring tools that work that way.
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