Poor contact will only flash, and no matter how high the voltage is, it will not exceed 220 volts. This is caused by excessive current or the diameter of the power cord is too small. The cause of excessive current is usually high-power heating appliances, such as rice cookers, electric stoves, and electric heaters.

If the power cord plug used is not the original factory configuration, and the wire diameter is too small, or if the overcurrent is too low when using the mobile socket, it will cause burning or even fire. For example, the plug is inserted into the plug-in board and the contact area is small and only a little bit, and the excessive current required is the main reason that the plug is burned!

If it is determined that the triangular plugs are all burned out, it is not recommended to continue using them. Replace it even if it can be used. At the same time, check whether the electrical appliances are malfunctioning, and the plugs are not damaged by ablation.

1. The electrical interface burning black is usually caused by arc sparking, and the incomplete contact area with the plug connection is too small, and the current is too concentrated during work.

2. The instant high temperature of arc ignition causes the formation of an oxide layer on the metal surface, which affects subsequent use. Prone to poor contact. Improper insertion will cause the temperature to rise slowly, and the phenomenon of melting and burning will occur after the heat accumulates. Due to the high temperature, the internal deformation and contact conditions have further deteriorated, and continued use is likely to cause damage to the electrical appliances. How to prevent plugs from being burnt black: Pay attention to the power of electrical appliances when using plugs and sockets. Don't use one socket too concentratedly. High-power electrical appliances are separated on different circuit sockets, and the load current is shared equally. The plug must match the socket. Do not mix different plug and socket types. The plug must be inserted firmly and as deep as possible to ensure good contact.