Grounding in power systems: An important tool to keep workers safe in the event of unexpected voltages appearing on equipment and lines that have been powered off. According to ministerial regulations, the grounding wire must be made of bare copper flexible wire of 25mm2 or more.
In electrical appliances: the grounding wire is the line that is connected to the casing of the electrical equipment to promptly export the unsafe electric charge or leakage current caused by various reasons.
In layman's terms: grounding can prevent static electricity or leakage on the surface of electrical equipment from causing click damage to people, especially high-power electrical appliances.
