How to distinguish between neutral wire and live wire using a digital multimeter
1. First, check the multimeter to see if it is in good condition. Insert the black probe into the com end and the red probe into the v/R end, and prepare accordingly.
2. Set the gear to AC 500V, ground the black probe (or any object that conducts electricity with the ground), and make contact with two wires with the red probe. If the number on the meter changes, it will display around 220V as the live wire and the other as the neutral wire.
3. Wrap the wire of the black probe around your hand three times, remember not to touch the probe, and the red probe should touch two wires respectively. The one with a change in the number on the gauge is the live wire, and the other is the neutral wire. (Small experience: In general, one end of a digital meter is suspended and the other end is in contact with a wire. If there is a faint number display, it indicates a live wire. If not, it indicates a neutral wire.)
In short, measuring the neutral wire and the live wire is so easy. Now let's talk about how to distinguish between the live wire, the ground wire, and the neutral wire?
1. Set the digital multimeter to AC voltage range of 500V, first ground one of the probes, and then connect the other probe to one of the other wires. If the voltage displays around 180-230V, it is the live wire. Use this probe to measure the other wire. If the voltage is around tens of volts, it is the neutral wire. If only a few volts change or remain constant, this is the ground wire.
2. According to national regulations, yellow, green, and red are the phase lines, blue is the neutral line, and yellow green is the ground line.
