The power cords of general household wall switches and wall power sockets are installed inside the wall, and polarity detection function can be used to test whether there are any misconnections in the wiring and installation process, or if there are situations such as cutting corners and laying fewer grounding wires. It can mainly detect the states of power sockets such as misplaced fire neutral wire, misplaced fire ground wire, missing ground wire, missing live wire, and missing neutral wire. In mild cases, the power cannot be connected, and in severe cases, it can burn out electrical appliances and cause electric shock hazards

The consequences of connecting the AC socket incorrectly

1、 Reverse the connection between the neutral wire and the live wire

Reverse connection does not affect the use of household appliances, but there are safety hazards for safe use of electricity. Some household appliance switches are used to control the live wire. Once the neutral wire is reversed, it will cause the control switch of the household appliance to control the neutral wire. In other words, when the household appliance switch is disconnected, the interior of the appliance will be charged, which can easily cause safety hazards. For example, if a socket is plugged into a wall switch, even if the switch is turned off, the socket will still be charged. If a metal object comes into contact at this time, it can cause electric shock

2、 Missing ground wire

When an electrical appliance malfunctions, the power supply may break down certain electrical components, causing the casing of the appliance to become electrified. The ground wire can act as a leakage protection device, directing the electricity from the casing to the ground to prevent electric shock caused by human contact with the electrified casing