1. When some users use a three-core socket (head), they only connect the neutral wire to the left end of the socket and the phase wire to the right end, and the grounding end is left empty; some users connect the phase and neutral wires in the socket inversely. Although this has no effect when the electrical equipment is normal, it loses its safety protection function. Once the electrical equipment leaks, an electric shock may occur.

2. The ground terminal of the socket of the ground resistance tester is directly connected to the zero terminal. In this way, the working neutral wire is also used as a protective neutral wire. However, if this wiring method encounters the reverse connection of the phase and neutral wires, there are devices such as fuse and switch on the working neutral wire. Once the neutral wire is disconnected, Would be very dangerous. Therefore, the protective grounding wire cannot be shared with the neutral wire.

3. Some users of the grounding resistance tester insert an iron wire or steel bar into the ground. Regardless of whether the grounding resistance is suitable, they use a wire to connect it to the metal shell of household appliances such as refrigerators and washing machines. These are not up to the requirements.

4. Users of high-rise residential buildings with grounding resistance tester even use water pipes or gas pipes as grounding bodies, which is quite dangerous. Because the surface of water pipes and gas pipes are coated with anti-corrosion coatings, in addition, the joints of the water pipes are sealed with plastic raw material tape, and some underground water pipes are made of PVC pipes, and these are bad Conductors, there is no guarantee of safety at all. If the gas pipeline is used as the grounding body, if an accident occurs, the consequences will be disastrous.

In order to ensure personal safety and the normal use of electrical equipment, the power supply department must provide a stable quality power distribution network and a set of safe, reliable, fast and sensitive equipment protection devices; the construction department must have a skilled construction team; electrical equipment manufacturers must provide Products and perfect services; users must also master a certain amount of common sense of safe electricity use and establish a strong sense of self-protection. Only when all parties work together can electrical equipment be fully, effectively and safely used in our daily lives.