The ground wire is connected to the earth and uses the earth as the current loop conductor. The main role is to ensure the safety of electricity and suppress various interference signals. The electric field generated by the interference source is limited to the outside of the metal shield, and the charge packet induced on the surface of the shield body is Introduce earth to avoid excessive noise in the system due to interference when there is no sound signal in the sound system. Sound system with high sound quality requirements should be equipped with a dedicated audio grounding system. The grounding resistance should be less than 1 ohm. To minimize the grounding resistance, it is necessary to expand the area of the conductors, deep-buried and salt water. There are clear requirements and regulations for grounding in the standard.
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