What should I do if the multimeter checks that one of the live wires is connected to the ground for a short circuit?
Once a cable is buried underground and there is a leakage, generally users who do not have an instrument to measure it will have no way to start. First, they do not know where the leakage is, and it is impossible to dig out the entire underground cable. I have the following measures:
a). If this cable is more expensive, take the leakage wire as the zero wire, use the original zero wire or ground wire to swap with the leakage live wire, and connect the entire output wire to the leakage protection pile head. Re-install the leakage protection at the lower end of the ground, because this leakage line has been grounded, so let it be grounded again as a neutral line! (In this case, it must be used when there is no leakage protection installed above)
b) If the line is not far away, simply turn the leakage line into a ground line and re-lead a neutral line to send it there.
I have also used an empty rack cable to send electricity. After a few years, the black rubber skin on the outside is most likely to age after being exposed to the wind and sun. It will trip when it rains. The rubber cable can’t even touch the engine oil. It's better than the air. If it has been used for several years and there is an aging leakage, it must be replaced. (This polyoxyethylene outer layer insulation is more durable.)
For the leakage of buried wires, the traditional method is to use the bridge calculation method. If the total length of the cable is known, the distance of the cable fault can be calculated after measurement. This method is calculated by using the principle that the resistance of the cable is proportional to the length. The bridge method has been practical for many years and is simple and reliable. However, it is necessary to know the buried route of the cable to find out the fault point. The audio current measurement method is to input the audio current into the cable, and use the receiver to detect the change of the sound to confirm the location of the fault. This method can not only determine the horizontal position of the fault point, but also measure the depth of the fault point buried.
