If it is normal electrical wiring, live wire, neutral wire and ground wire are all wired according to wiring standards, then we can directly distinguish them from colors:
The fire line has three colors, namely yellow, green and red; There is only one color of the zero line, and that is light blue; There is only one color of grounding wire, and that is yellow and green.
Testing with a digital test pen:
1, if there is no leakage protection installed at home or it is on, then we can buy a digital test pen to measure voltage;
2. After power-on, we test the connectors of the three wires with a digital test pen, and see the voltage value on the digital test pen;
3. The highest voltage value is the live wire, the lowest voltage value is the ground wire, and the middle voltage value is the zero line.