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What are the regulations for the safe use of grounding wires

25-08-2020

What are the regulations for the safe use of grounding wires?

The grounding wire is a wire directly connected to the earth, which can also be called a safety loop wire. When it is dangerous, it transfers the high voltage directly to the earth, which is regarded as a lifeline.

 


Due to poor insulation performance or humid environment for household appliances, the shell will be charged with static electricity, and electric shock accidents may occur in serious cases. In order to avoid accidents, you can connect a wire to the metal shell of the electrical appliance and connect the other end of the wire to the ground. Once the electrical leakage occurs, the ground wire will bring static electricity into the ground and release it. In addition, it is more important for electrical maintenance personnel to use electric soldering irons to solder circuits, sometimes because the electric soldering irons are charged and break down and damage the integrated circuits in the electrical appliances. Friends who use computers sometimes ignore the grounding of the mainframe. In fact, connecting a ground wire to the mainframe of the computer can prevent the occurrence of crashes to a certain extent.

In the power system, the grounding wire is an important tool to ensure the staff when there is unexpected voltage on the equipment and lines that have been powered off. According to ministerial regulations, the grounding wire must be made of bare copper flexible wire over 25mm 2. Resistance requirements:

The grounding resistance requirements of the high-voltage short-circuit grounding wire determine the quality of the grounding wire. Generally, in accordance with the technical regulations of the power industry DL-T879-2004, the grounding resistance of each cross-sectional area to the ground shall not be greater than the following values: