Why do air conditioners, refrigerators, washing machines, etc. use three-wire plugs

Why do air conditioners, refrigerators, washing machines, etc. use three-wire plugs

Three-wire plug: neutral wire, live wire, ground wire. The ground wire belongs to the type of leakage protection! High-power electrical products are protected by three-phase plugs

　　 Three-phase plugs for the left neutral wire, right live wire and neutral ground wire. Among them, the ground wire belongs to the type of leakage protection, also called ground protection! The three-phase plug used in electrical products is used to protect the grounding of the shell to prevent people from getting an electric shock when using electrical appliances!

Air conditioners and refrigerators have bare metal shells. In order to prevent electrical shocks from electrical leakage, three-pole sockets with ground terminals are used to protect the lives of those who are shocked. Generally, two-wire plugs or sockets are used for relatively low-power appliances, while three-wire plugs are larger. In addition, the two-wire is easy to loosen, and the three-wire is not easy to move and the contact is firm.

　　As a daily household appliance, it brings us a lot of convenience! However, once a fire occurs in a household appliance, the consequences are unimaginable, causing unlimited loss of personnel and property, social evil and its impact! Therefore, our country stipulates: household appliances must use three-wire plugs!

The three-wire plug is a live wire, a neutral wire and a grounding wire. The function of the three-wire plug is to better protect the safety of the staff when using household appliances with metal shells, so as to prevent the staff from causing death accidents when they are in use. This happens because when the leakage occurs, the extra bottom line can effectively lead the exposed current into the ground! Thereby protecting people who use electrical appliances!

　　 Three-wire connection The home circuit is generally powered by two wires, one live wire and one neutral wire. Indoor sockets are generally two-hole sockets and three-wire sockets. The three-wire socket is connected to three wires: one is connected to the live wire (usually marked with L); one is connected to the neutral wire (marked with N); the third line is connected to the outdoor ground (marked E), and the plug is connected to the metal shell of the electrical appliance.

Three-wire benefits include high-power motors (such as washing machines, refrigerators, electric fans, air conditioners, rice cookers, etc.). Household appliances mainly consider their large power, high heat, and often in a state of small vibration during operation, between the coil and the motor shell The insulation is easy to damage and cause leakage, and the ground wire can lead the leakage into the ground to ensure safety. In addition, the induced current formed by the distributed capacitance between the coil and the motor can also be led to the ground through the ground wire.