Why do you need to install a leakage protector after the protection is connected to zero?
A: Regardless of whether the protection is connected to zero or grounded, the scope of protection is limited. For example, “protection to zero†means connecting the metal casing of the electrical equipment to the neutral line of the power grid and installing a fuse on the power supply side. When a fault occurs in the electrical equipment (a phase touches the outer casing), a single-phase short circuit of the relatively neutral line is formed. Since the short-circuit current is large, the fuse is quickly blown and the power supply is disconnected for protection. The working principle is to change the "cracking fault" to "single-phase short-circuit fault", so as to obtain a large short-circuit current cut-off insurance. However, electrical faults on the construction site are not frequent. Frequently, leakage faults, such as equipment moisture, excessive load, long lines, and aging insulation, are small. These leakage currents are small and cannot be quickly cut off. Therefore, the fault does not automatically disappear and exists for a long time. However, this leakage current poses a serious threat to personal safety. Therefore, it is necessary to install a more sensitive leakage protector for supplementary protection.
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