jmd445
Senior Member
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The NEC in 250.56 states that the ground rod, etc cannot have a resistence exceeding 25 ohms to ground. How do you test this? What do you use as a reference?
Jim
Jim
Ground rod testing
- Thread starter jmd445
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- Lockport, IL
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- Semi-Retired Electrical Engineer
Re: Ground rod testing
That is not what it says. What is says is that if the first is above 25 ohms, then you can install a second and call it a day. You don?t have to measure the second, to see if you have gone below 25 ohms.
There is another thread discussing the measurement process. It is here.
To avoid duplication of the discussion, I am closing this thread.
That is not what it says. What is says is that if the first is above 25 ohms, then you can install a second and call it a day. You don?t have to measure the second, to see if you have gone below 25 ohms.
There is another thread discussing the measurement process. It is here.
To avoid duplication of the discussion, I am closing this thread.
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