Ground Test
- Thread starter jamal
- Start date
- Status
- Location
- Lockport, IL
- Occupation
- Semi-Retired Electrical Engineer
Re: Ground Test
I think the best way is to disregard the ohms of the first rod, and simply install a second. With two rods, you don't need to measure. But I'll have to let someone else answer your question.
I think the best way is to disregard the ohms of the first rod, and simply install a second. With two rods, you don't need to measure. But I'll have to let someone else answer your question.
karl riley
Senior Member
Re: Ground Test
And also ask yourself, effective for what function? The average ground rod impedance is a little over 100 ohms in 5 midwestern states. Is the 100 ohm rod not effective? You have to know what it's for.
Karl
And also ask yourself, effective for what function? The average ground rod impedance is a little over 100 ohms in 5 midwestern states. Is the 100 ohm rod not effective? You have to know what it's for.
Karl
Re: Ground Test
There is really no way to determine the effectiveness of a ground rod. It's intended function (to help disperse lightning and surges) can't be accurately measured.
Roger
[ August 22, 2003, 12:36 PM: Message edited by: roger ]
There is really no way to determine the effectiveness of a ground rod. It's intended function (to help disperse lightning and surges) can't be accurately measured.
Roger
[ August 22, 2003, 12:36 PM: Message edited by: roger ]
brian john
Senior Member
- Location
- Leesburg, VA
Re: Ground Test
The best approach is to perform a 4 point earth ground resistance test PRIOR to installing a ground electrode system.
This test will assist in determining the design of the grounding electrode system (assuming you have a spec or standard to meet).
After the system is installed a three point test is utilized to determine the effective resistance of the ground electrode. Of course this value will change due to weather condition, after lightning strikes ect..........
There are numerous sites with information www.lyncole.com for starters
The best approach is to perform a 4 point earth ground resistance test PRIOR to installing a ground electrode system.
This test will assist in determining the design of the grounding electrode system (assuming you have a spec or standard to meet).
After the system is installed a three point test is utilized to determine the effective resistance of the ground electrode. Of course this value will change due to weather condition, after lightning strikes ect..........
There are numerous sites with information www.lyncole.com for starters
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