<quote>If you stand outside barefoot and touch something metal.. You get a tingle. For example, we were planting some trees and the root ball had the metal cage around it. The cage was in contact with the ground, and when I knelt down with a bare knee to the ground and touched the cage...zaaaaap !
It seems like the metal you are touching is also touching the ground. People usually don't have a problem on their own, but I have heard of cows that had problems because their feet were touching the ground in different places so they were getting shocked. That problem was current leaking from a high voltage power line.
I expect you do not get shocked when you touch a car, because the rubber tires insulate it from the ground.
In order for this to happen, there has to be current flowing through the ground from one place to another. Try an experiment with your meter. Connect the leads to two probes, which should be insulated if you don't want to get shocked, and put the probes in the ground 6-10 feet apart. Then try the same but with the probes separated in a different direction. If you leave one probe in the ground and move the other in a circle, you should find one place on each opposite side of the circle where the voltage is maximum, and another place where the voltage is zero. The probes when a maximum voltage direction will be pointing toward the problem. Then move the whole assembly some distance in the zero-voltage direction and do it again. If the two maximums are the same direction, the current source is a relatively long distance away, relative to the distance you moved. If the two maximums point different directions, the problem is likely to be where those directions intersect. You might need to try several times because the current could be traveling in an arc. If you are fairly close to the high voltage power line, it is likely to be pointing at the base of the metal tower, proving there is a leaking insulator on that tower. The most likely result will be that not all towers leak; you might be able to find one that is the main problem. Be careful, because as you get close to the source the voltage at the same distance separation will increase and could be enough to be very dangerous.
Once identified, the problem CAN be fixed.
- Benjamin