GB/T 12501.2-1997

This standard provides guidelines for classifying electrical and electronic equipment based on its protection against electric shock, specifically detailing the requirements for different protection classes (Class 0, I, II, and III). It is applied in the design, testing, and certification of electrical and electronic products across industries such as consumer electronics, industrial machinery, and household appliances to ensure user safety. The standard serves as a reference for engineers and procurement professionals to verify that equipment meets national safety criteria for insulation, grounding, and voltage levels.