This standard specifies the technical requirements for AC metal enclosed switchgear and control equipment assembled in factories with rated voltages ranging from 3.6 kV to 40.5 kV, installed indoors or outdoors, and frequencies of 50 Hz and below. The casing may contain fixed or removable components and may allow for insulation and/or disconnection fluids (liquids or gases). Note 1: This standard is mainly applicable to three-phase systems, but can also be used for single-phase or two-phase systems. According to the following points, this standard divides metal enclosed switchgear and control equipment into thousands of categories The continuity of power grid operation when repairing switchgear and control equipment - the need and convenience of equipment maintenance. Note 2. The safety of equipment depends on the design, use, adjustment, coordination, installation, and operation of the product. For metal enclosed switchgear and control equipment with inflatable isolation, this standard applies when the design pressure does not exceed 0.3MPa (relative pressure). Note 3. Inflatable compartments with a design pressure exceeding 0.3 MPa (relative pressure) should be designed and tested in accordance with GB 7674. Special purpose metal enclosed switchgear and control equipment, such as those used for flammable gases, mines, or ships, may require additional technical requirements. The components installed in metal enclosed switchgear and control equipment shall be designed and tested in accordance with the provisions of their respective standards. Considering the installation of various components in complete switchgear and control equipment, this standard supplements the standards for individual components. This standard does not exclude the use of other equipment in the same enclosure, and the impact of the equipment on the complete switchgear and control equipment should be considered. Note 4. Salted switchgear and control equipment with insulation and external brightness shall comply with 1EC 60466; Regulations of 1987, note 5. Air insulated metal enclosed switchgear and control equipment with a rated voltage of 40.5 kV or above, if they meet the insulation level specified in GB/T 11022-1999, this standard is also applicable
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