Multimeter distinguishes whether the power supply line is live wire or neutral wire

The first method: You can use the above method to judge: the larger number is the live wire, and the smaller number is the neutral wire. This method requires contact with the line or device being measured.

The second method: no contact with the circuit or device being measured is required. Set the multimeter to AC2V, leave the black test pen hanging in the air, hold the red test pen and gently slide the pen tip along the line. If the meter shows a few volts, it means that the line is a live wire. If it shows only a few tenths of a volt or even less. This means that the line is the zero line. This judgment method does not have direct contact with the line. Not only safe but also convenient and fast.