Connecting the zero wire and the ground wire together will cause great harm to personal safety and equipment safety, and the potential safety hazard is great. It is a wiring method that is not allowed. For example, electricity leakage protects our personal safety. The neutral line is circuit-acting.

Vending machine accessories solution, you first temporarily remove the ground wire of the main electrical box, and then detect, the zero line and the ground wire must be clearly distinguished. When you have a clear distinction, don't forget to take the ground wire back! Distinguish with a voltmeter: the voltage between different phase lines (i.e. live wires) is line voltage 380V, the voltage between phase lines (live wires) and neutral lines (or good grounding body) is phase voltage 220V, and the voltage between neutral lines and good grounding bodies is 0V. There will be no serious consequences for the time being. The problem is that the neutral line may generate a voltage to ground at some point (although it is also grounded).

Although the grounding resistance at the transformer is very small, if the phase line is short-circuited to the ground, a large short-circuit current to the ground will be generated, and the grounding resistance flows back to the neutral point of the transformer, and the shell of the electrical equipment is connected, which means that the human body will contact this part, so it will also endanger the safety of the human body.