Due to poor insulation performance or humid environment, the housing of household electrical equipment will be static electricity, which will lead to electric shock.To avoid accident can be above the metal shell of the electrical connection of a wire, the wire at the other end of the earth, and the access once electric leakage occurs grounding line will release the electrostatic into the earth.In addition, when using electric soldering iron to weld electric circuits, sometimes electric soldering iron will be charged and damage the integrated circuits in electric appliances, this is more important.The friend that USES a computer sometimes also can ignore main machine case
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