Ground faults are different from normal electrical short faults. It is a short-circuit fault of the charged conductor through the metal material and the earth. Because the ground fault is relatively concealed, it is often the cause of multiple fires, and often accompanied by ground faults, electric shock personal injury accidents occur. Therefore, from the safety considerations of residential residents, it is necessary to strengthen the prevention of grounding faults in industrial electrical.
First, it is forbidden to connect the PE line to the N line. If the PE line is connected to the N line, it becomes a TN-c system, and its adverse consequences have been discussed previously.
Second, each residential main power line breaker should have leakage protection. In addition to the air conditioning power supply, other power outlets should be provided with leakage protection devices. It protects against electrical fire and electric shock by two-pole protection.
Third, equipotential and local equipotential bonding. Equipotential bonding is an important safety measure to prevent the risk of electric shock. It can greatly reduce the contact voltage that people experience when grounded. Fourth, the power supply line is repeatedly grounded. Repeated grounding should be carried out when the power supply mains cable enters the building, and a surge protector is added for overvoltage protection.
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