Now I understand why so many people in US have stories of computers blowing up during thunder storms.
This is a pretty dumb rule for ground electrodes:
If the resistance is over 25 ohms for an electrode, the code requires that an additional electrode be installed at least 6 feet (1829 mm) away from the first one. There is NO requirement to keep adding electrodes until the resistance is reduced to 25 ohms or less.
So pretty much everybody is putting 2 rods down and they are done. Easy for the electricians.
The result is that home owners most likely end up with 2 electrodes and a total resistance to ground of 150 Ohm or more. That is insane.
In some countries in EU you are supposed to have max 10 Ohm resistance in every condition!
Does anybody actually care to measure the ground resistance and keep it below 25 Ohm?
This is a pretty dumb rule for ground electrodes:
If the resistance is over 25 ohms for an electrode, the code requires that an additional electrode be installed at least 6 feet (1829 mm) away from the first one. There is NO requirement to keep adding electrodes until the resistance is reduced to 25 ohms or less.
So pretty much everybody is putting 2 rods down and they are done. Easy for the electricians.
The result is that home owners most likely end up with 2 electrodes and a total resistance to ground of 150 Ohm or more. That is insane.
In some countries in EU you are supposed to have max 10 Ohm resistance in every condition!
Does anybody actually care to measure the ground resistance and keep it below 25 Ohm?
