This standard applies to three pole AC load switches and isolation load switches with rated voltages of 3.6 kV to 40.5 kV, frequencies of 50 Hz, installed indoors or outdoors, and rated making and breaking currents. This standard also applies to the operating mechanisms and auxiliary equipment of these load switches. The isolation load switch should also meet the relevant provisions of GB 1985. The general principles and regulations in this standard also apply to single pole load switches in single-phase systems. The requirements for insulation testing, making and breaking tests should meet the requirements of the specified usage occasions. Note 1: Unless otherwise specified, the term "load switch" represents all types of load switches and isolating load switches within the scope of this standard. Note 2: The grounding switch is not included in the scope of this standard. The requirements for grounding switches as part of load switches are included in GB 1985. Note 3: This standard does not apply to load switches operated by opening and closing fuses and used as accessories for high-voltage fuses. 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 311.1-1997 Insulation Coordination of High Voltage Transmission and Transformation Equipment (neq IEC 60071-1: 1993) GB/T 762-1996 Standard Current (eqv IEC 60059: 1938) GB 1984-2003 High Voltage AC Circuit Breakers (mod IEC 62271-100:2001) GB 1985-2004 High Voltage AC Isolation and Grounding Switches (mod IEC 62271-102:2002) GB/T 2900.20-1994 Electrotechnical Terminology High Voltage Switchgear (neq IEC 60050) GB/T 11022-1999 Common Technical Requirements for High Voltage Switchgear and Control Equipment Standards (eqv IEC 60694-1996) GB 16926-1997 AC High Voltage Load Switches - Fuse Combinations (eqv IEC 60420:1990>) IEC 61233-1994 High Voltage AC Circuit Breakers - Inductive Load Switching
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