Grounding wire is directly connected to the earth, also known as safety back line, it took the risk of high-voltage direct onto the Earth, considered a lifeline. Household appliances due to poor insulation or humid environment, will lead to its shell with a certain amount of static electricity, and in severe electric shock. In order to avoid such occurrences can be connected to a wire in the electrical metal casing above the other end of the wire to earth, when a leak occurs when electrical static grounding line will bring to earth freed. In addition to electrical maintenance personnel in the use of electric soldering iron circuit, sometimes because of a charged electric iron and damage to electrical breakdown of the integrated circuit, which is more important. Use of computer friends sometimes ignore the host shell ground, in fact, connected to the host computer shell root ground, to a certain extent, can prevent the phenomenon of death.