Scope: This standard applies to the protection classification of electrical equipment with a rated voltage not exceeding 725 kV and protected by enclosures. The purpose of this standard is as follows: a) to specify the degree of protection provided by the enclosure of electrical equipment for: 1) protection against hazardous components in the enclosure that can be touched by the human body; 2) protection against solid foreign objects entering the enclosure; and 3) protection against harmful effects of water entering the enclosure on the equipment. b) Identification of protection level. c) Requirements for identification of each protection level. d) According to the requirements of this standard, the degree and method of citing the protection level of the casing for various products, as well as the type of casing used, shall be determined by the product standard. The specific protection level test used shall comply with the provisions of this standard. If necessary, supplementary requirements can be added to the divided product standard. Please refer to Appendix B for specific details that can be specified in the divided product standard. For special types of equipment, product standards can specify different requirements, but at least the same level of safety must be ensured. This standard only considers enclosures that comply with relevant product standards in all aspects. Under normal usage conditions, the materials and processes of the enclosure should ensure that they meet the required level of protection. If a certain type of equipment meets the general requirements of testing and the selected protection level is applicable to the type of equipment, then this standard also applies to the empty shell of that type of equipment. The protective measures for external influences such as sharp mechanical damage, rust, corrosive solvents (such as cutting fluid), mold, insect infestation, solar radiation, freezing, moisture (such as condensation), explosive gases, or environmental conditions that can damage the casing and equipment inside the casing, as well as preventing contact with hazardous moving parts outside the casing (such as fans), are specified in existing product standards. Bulkheads that are not connected to the casing and barriers specifically designed for personal safety are not considered part of the casing and will not be studied in this standard
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