1.1 Scope This standard specifies the technical requirements for factory assembled AC metal enclosed switchgear and control equipment with a rated voltage of 3.6 kV~40,5 kV, installed indoors or outdoors, and a frequency of 50 Ha and below. The casing may contain fixed or removable components and may be filled with insulation and/or breaking fluids (liquid or gas). 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 several categories-- Continuity of power grid operation during maintenance of 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 compartments, this standard applies when the design pressure does not exceed 0.3 MPa (relative pressure). Note 3: Design pressure exceeds О. Inflatable compartments with a relative pressure of 3 MPa should be designed and tested in accordance with GB7674. 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:; Complete sets of switchgear and control equipment with insulated enclosures shall comply with the provisions of 1EC 604661987; Note 5: For 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 also applies. 1.2 Normative References: The clauses in the following documents become clauses of this standard through reference in this standard. For dated reference documents, all subsequent amendments (excluding corrected content) or revisions are not applicable to this standard. However, parties to agreements based on this standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest version applies to this standard. GB/T 1408.1-1999 Test Methods for Electrical Strength of Solid Insulation Materials - Tests at Power Frequency (eqv lEC 60243-1:1988) GB 1984-2003 High Voltage AC Circuit Breakers (IEC 62271-100:2001 MOD) GB 1985-2004 High Voltage AC Disconnectors and Earthing Switches (IEC 62271-102:2002 MOD) GB/T 2423.17-1993 Basic Environmental Testing Procedures for Electrical and Electronic Products, Part 17, Test Ka: Salt Spray Test Method (eqv IEC 60068-2-11:1981) GB/T 2900.20-1994 Electrotechnical Terminology, High Voltage Switchgear (NEQ IEC 60050 (441), 1EC 60056, etc.) GB 3804-2004 3.6 kV~40.5 kV high-voltage AC load switches (IEC 60265-1:1998 MOD) GB 4208-1993 Degrees of protection provided by enclosures (IP code) (eqv IEC 60529:1989) GB/T 7354-2003 Partial discharge measurement (IEC 60270: 2000 IDTGB/T 8905-1996 Guidelines for gas management and inspection in sulfur hexafluoride electrical equipment (neq lEC 60480; 1974) GB/T 11022-1999 Common technical requirements for high-voltage switchgear and control equipment standards (eqv TEC 60694; 1996)