When testing the operation of the Zhigao KFR-120LW1H air conditioner, the leakage protection switch tripped.
Analysis and Inspection: The power supply is a three-phase five-wire system with three phase wires, one neutral wire, and one ground wire. Upon inspection, it was found that the neutral wire and ground wire were incorrectly connected.
Repair Method: Swap the neutral wire and ground wire to resolve the fault.
Warm Reminder: For a three-phase five-wire power supply, when the neutral and ground wires are incorrectly connected, current will flow through the ground wire as soon as power is applied. Since the earth acts as an infinitely large capacitor, the leakage protection switch will naturally trip. Therefore, when wiring, it's important to clearly distinguish between the neutral and ground wires to avoid incorrect connections. If the leakage protection switch fails to function, installation personnel may be at risk of electric shock.
Source of Information: Beijing Zhigao Air Conditioning Repair Center http://blog.tianya.cn/blogger/blog_main.asp?BlogID=3482552.