How to use a non-contact voltage detector pen to test the lamp to detect the reversal of the phase and neutral lines of a single-phase electric energy meter
Domestic single-phase electric energy meter, one input and one output wiring. Check the two outgoing wires of the lamp, one wire end is grounded first, the other end touches the meter terminal, and the incoming and outgoing wires on the right side.
If the wiring is correct, the light will not light, and the neutral line will be reversed when the light appears.
