Short circuit at home, property trip

I am a property maintenance worker, which is also a problem that bothers me! Then an old man told me the reason. General property master switches are all three-phase and four-wire, that is, a total leakage protection period, referred to as omission. When there is no leakage in the outgoing line, the neutral line is not charged, but once there is leakage, the neutral line is charged. Once the switch detects that the neutral line is charged, it will trip. The solution is either to increase the leakage current of the main switch or to remove the zero line, that is, to change it into a three-wire three-wire switch.

The sensitivity of the main switch is generally greater than that of the household, so once there is leakage, jump the main switch first!