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Overall system grounding resistance?

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jshave

Member
Location
California
Occupation
Technician
I'm trying to figure out the system grounding resistance on a stretch of distribution line.
I know I need 4 ground rods per mile. This will be over about 5 miles. I have the resistance of each individual rod.
I have the grounding system resistance the substation is designed for.
I have the conductor resistance over a distance.

Is the overall system grounding resistance just: 1/R=((1/resistance single ground rod)*number of ground rods)?
 
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