Explanation：
Because when the plug is inserted into the socket, wire (L) pins and zero line (N) pins are almost impossible at the same time inserted into .If there is a load at this time, the socket in contact with the socket will be very small distance from the socket, and the original insulated air will be broken down. Therefore, the phenomenon of arc will occur, and the ignition may leave a slight burning phenomenon in the socket.The above is a normal phenomenon, not electrical equipment or wiring board quality problems
Because when the plug is inserted into the socket, wire (L) pins and zero line (N) pins are almost impossible at the same time inserted into .If there is a load at this time, the socket in contact with the socket will be very small distance from the socket, and the original insulated air will be broken down. Therefore, the phenomenon of arc will occur, and the ignition may leave a slight burning phenomenon in the socket.The above is a normal phenomenon, not electrical equipment or wiring board quality problems