Whether the ground wiring is effective or not is related to our personal safety, so we must not be careless. It is necessary to learn how to confirm whether our home ground wire is effective.
We can use the multimeter's function of measuring the line resistance to detect the resistance of the home wire to judge whether the ground wire is valid. The detection requirement is that we choose a digital multimeter with a measured value or a mechanical multimeter. We must first The ground wire of the home is removed from the zero row, and then a wire is used to connect the meter to the multimeter. The specific method is: we first adjust the range of the multimeter to the resistance file, remember that the resistance file is the smallest file; then use the multimeter needle Connect one pin to the ground wire removed from the power distribution box, connect the other hand to the position to be measured, and then use the multimeter's hands to touch the other end of the ground wire to observe the reading of the multimeter. If the reading is less than or equal to 4Ω or Close to zero, then the ground line is valid. If the reading is greater than 4Ω, the ground line is invalid. Using the same method, we measure each ground line one by one, so we can judge the ground wire.
Using the function of measuring voltage of the multimeter to detect whether the ground wire is effective, we should know that the voltage of the live wire to the neutral wire is 220V, and the voltage of the live wire to the ground wire is also close to 220V. It is to use this principle to check whether the ground wire is effective; the preparation work is We will prepare a multimeter that can be used first, and then send the circuit at home to prepare for measurement. The specific method is: we adjust the range of the multimeter to the voltage file of 750V, and then touch the position of the test with a multimeter of the multimeter. For example, the fire wire of the socket and the other pen touch the ground wire. If the reading of the multimeter is close to 220V, the ground wire is valid; if the multimeter reading is far less than 220V, the ground wire is unqualified. If the multimeter reading is zero, then the ground wire of our home is indicated. It is fake at all; this method requires electricity to operate, and non-professional electricians should not try it, it is dangerous.