Can the neutral wire be directly connected to the ground wire?

The neutral wire is the lead of the medium-sized point of the transformer, which is directly grounded at the transformer end, while the ground wire is repeatedly grounded, and it is grounded again at intervals, which is to ensure the absolute 0 potential of the ground wire. Therefore, if the neutral wire and the ground wire cannot be connected together at the load end, in the three-phase 5 wire, if the ground wire and the neutral wire are connected together, then it is no different from the 4 wire.

The material depends on the situation, the end of the ground wire is generally connected to the ground with a flat bar, and the neutral wire is directly connected to the phase wire in the single-phase circuit, which is similar to the phase wire.

The resistance of the ground wire is smaller than that of the neutral wire, because the ground wire is repeatedly grounded, and the neutral wire is only grounded in the transformer, when the load is far away from the transformer, the resistance of the neutral wire is much larger than that of the ground wire, and generally we stipulate that the resistance of the ground wire does not exceed 4 ohms.

The neutral line is generally not repeatedly grounded, and the grounding of the equipment must ensure that its shell is O potential to the ground, even if there is a current, it is okay for people to touch it, because there is no voltage to the ground.

1. Impact: The connection of the neutral wire and the ground wire together will cause great harm to personal safety and equipment safety, and the potential safety hazards are great. It is absolutely not allowed to be used.

2. Analysis: The ground wire is a safety protection wire connected to the shell of the electrical appliance, and the ground wire does not participate in the work of the line under normal circumstances. Only when there is a short-circuit fault between the electrical appliance and the shell, the voltage carried by the ground wire discharge electrical shell ensures that the voltage of the shell to the ground is 0V.

The neutral line is the electrical circuit of the electrical appliance, and the live wire current passes through the electrical appliance and returns to the power supply through the neutral line, that is, the current flows through the neutral line, so as to ensure the normal operation of the electrical appliance. The neutral wire and the ground wire are connected together: when the electrical appliance is short-circuited to the shell, because the ground wire and the neutral wire are connected into one wire, the current will return to the power supply through two circuits, one is the neutral line circuit, and the other is the electrical shell ground wire power supply.

At this time, if the neutral line is broken, all the equipment shells on the ground wire are participants in the current circuit, once the ground wire is also broken or the contact is poor, all the equipment shells will be electrified, as long as the human body touches any electrical shell will be shocked, and an electric shock accident will occur. 3. Common wrong connection and solutions for non-ground wire lines Common wrong connection: In the line without ground wire, such as the old line of the old house, it is usually a fire and a zero two wires, and the wrong and dangerous zero wire in the socket is led to the ground wire terminal.

At this time, if the neutral line is broken, then the electrical shell of the socket will be electrified, causing a potential safety hazard of electric shock accidents. Solution: Install a 2P leakage protection air switch in the distribution box of the entrance line.

Once the line is short-circuited to the ground, the leakage protection switch will automatically power off immediately. Fourth, the solution that the live wire and the neutral line cannot be distinguished When the live wire and the neutral line cannot be effectively distinguished, it is difficult to make a detection judgment only for the first road terminal, such as the socket. It is necessary to go to the distribution box to distinguish the operation, provided that the neutral line and the ground wire in the distribution box have been distinguished.

Safety distinction method: disconnect the electric switch, check that there is no electricity. Connect an incandescent lamp between the live wire of any socket and any one of the remaining two wires, use a multimeter to measure the resistance of the live wire and the other two wires in the distribution box, the resistance is worth the wire connected to the bulb, and the infinite resistance is the suspended wire, according to what wire these two wires are in the distribution box, you can judge the zero wire or ground wire in the socket.

Professional detection: disconnect the power switch, remove the neutral wire and ground wire in the distribution box from the common end of the incoming line, and disconnect the connection with the incoming line. Connect the bulb with the above method 2 on the socket, close the switch, and measure which wire has electricity with an electric pen, and the wire with electricity is the unknown wire connected to the bulb, and the rest of the judgment methods are the same as above.

This is recommended by Zhen Haobin, an expert in science education classification.