The standard is suitable for using for the following AC disconnectors and earthing switches, like fixed indoors and outdoors, terminal is seal and open, the rated voltage is more than 3.6kV, and the operating frequency is less than 50HZ.
The standard is also suitable for the operation mechanism and its auxiliary equipment of these disconnectors and earthing switches.
The additional requirement of disconnectors and earthing switches in enclosed switch equipment and control equipment are given in GB 3906, GB 7674 and IEC 60466.
Note: the standard is exclusive of the situation that the fuse is not taken as a component of the disconnectors.
1.2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of the Specifications. For dated reference, subsequent amendments (excluding amending error in the text) to, or revisions of, any of these publications do not apply. However, the parties whose enter into agreement according to the Specifications are encouraged to research whether the latest editions of these references are applied or not. For undated references, the latest edition of the normative document is applicable to this standard.
GB/T 311.2-2002 Insulation co-ordination-Part 2: Application guide for insulation co-ordination for high voltage transmission and distribution equipment (eqv IEC 60071-2:1996)
GB/T 1804-2000 General tolerances－Tolerances for linear and angular dimensions without individual tolerance indications (eqv ISO 2768-1:1989)
