Useful life of underground RGS used as EGC

[xguard]

I realize this can vary by soil conditions. I'd like some general observations though of how long you've seen underground rigid galvanized steel conduit last, in a condition that is useable as an Equipment Grounding Conductor. Thanks for any feedback.

 

[augie47]

We have an industrial facility with a considerable amount of underground GRS conduit and ground readings are still fine after 30-40 years

 

[xguard]

We have an industrial facility with a considerable amount of underground GRS conduit and ground readings are still fine after 30-40 years

How are you determining they are still good? What method are you using for taking the grounding readings?

 

[augie47]

They have a company that tests their grounding on an annual basis. I am unsure of how they test.