What is the function of grounding wire?

The function of the connecting wire is to connect the conductive part of the metal shell of charged equipment such as electrical equipment or electrical cabinet with the earth to form an equipotential body. In this way, even if the shell of electrical equipment accidentally leaks electricity, the current will flow to the earth through the connecting wire and connect with the ground potential. The resistance of the ground wire is very small. When the current flows from the electric box shell to the earth through the connecting wire, the voltage drop of the line is very small, and the voltage between the electric box shell and the earth is very low, which can be ignored. Therefore, even if a voltage is applied to the human body when the human body contacts the shell of the electric box, the current passing through the human body is far less than the current of the human body getting an electric shock because the voltage is very low, and the human body will not get an electric shock.

Electrical appliances have a zero line and a live line, thus forming a path, allowing electrical appliances to have current to pass through and play a role.

Ground wire, also known as lightning rod, is used to introduce current into the earth; When the electrical equipment leaks or the voltage is too high, the current enters the earth through the ground wire. If the ground wire is not well connected, it will not work normally, which is a setting for the safety of users.

Grounding wire can be divided into power grounding wire and circuit grounding wire. When marking the circuit according to the conductor color, it should generally be the phase line-A phase yellow, B phase green and C phase red. Zero line-light blue, ground line is yellow-green. If it is three hole socket, the left is the zero line, the middle is the ground line (above), and the right is the live line.

Common grounding methods in electronic power equipment are: safe grounding: safe grounding refers to connecting the shell of high-voltage equipment with the earth; Lightning protection and grounding: generally, lightning rods are set at high places to connect with the earth to prevent the safety of equipment and personnel from being endangered when lightning strikes; Working grounding: working grounding is the reference potential for the normal operation of the circuit. This reference potential is usually set to zero. Unreasonable working grounding will increase the interference of the circuit; Signal: Signal ground is the common reference ground of zero potential of various physical quantity signal sources. Generally, the signal is weak and susceptible to interference, and unreasonable grounding will cause interference to the circuit. Analog ground: The analog ground is the common ground of the analog circuit at zero potential. There are small signal amplification circuits, multistage amplification circuits, rectification circuits, voltage stabilizing circuits, etc. In analog circuits, improper grounding will cause interference and affect the normal operation of the circuit; Digitally

Digital ground is the common reference ground of zero potential of digital circuit. Because the digital circuit works in the pulse state, especially when the front and back edges of the pulse are steep or the frequency is high, a large number of electromagnetic waves will interfere with the circuit. Unreasonable grounding will aggravate interference; Power ground: Power ground is the common reference ground of power zero potential; Power ground: Power ground is the common reference ground of zero potential of load circuit or power drive circuit.