Both national mandatory standards and IEC have technical requirements for the marking, anti electric shock protection, structure, electrical performance, mechanical performance, etc. of plugs and sockets for household and similar purposes. The following are the inspection standards and methods for plugs and sockets

1. Appearance inspection

1.1 The main components of the product should have the following markings:

- Rated current (amperes)

- Rated voltage (volts)

- Power symbol - The name, trademark, or identification mark of the manufacturer or seller

- Product model

- Certification mark

1.2 The correct symbols should be used on the product:

1.3 For fixed sockets, the following symbols should be marked on the main components:

- Rated current, rated voltage, and power supply properties - The name or trademark or identification mark of the manufacturer or seller The insulation length that should be peeled off before inserting the wire into the unthreaded terminal (if any) If the socket is only suitable for connecting hard wires, there should be a sign indicating that the threaded terminal is only suitable for connecting hard wires

- Model, which can be a catalog number 1.4 Appearance quality: The surface of the socket should be smooth, the shell should be uniform, without pores, cracks, indentations, bumps, damages, spots, and dirt; Metal parts shall be free from oxidation, rust, deformation, dirt, uniform coating, and brightness.

1.5 Packaging: The packaging box should indicate the product name, specifications, material code, factory name, quantity, and production batch number