This standard applies to alternating current disconnectors and earthing switches, designed for indoor and outdoor installation, for voltages above 1 000 V and for service frequencies up to and including 60 Hz.
This standard also applies to the operating devices of these disconnectors and earthing switches and their auxiliary equipment.
This standard does not deal with additional requirements for disconnectors and earthing switches in enclosed switchgear and controlgear as these are covered by IEC Publications 298: A.C. Metal-enclosed Switchgear and Controlgear for Rated Voltages Above 1 kV and up to and including 72.5 kV, 466: High-voltage Insulation-enclosed Switchgear and Controlgear and 517: High-voltage Metal-enclosed Switchgear for Rated Voltages of 72.5 kV and Above.
Note. — Disconnectors in which a fuse is an integral part are not covered by this standard.
SIS SS-IEC 129:1990 history
1990SIS SS-IEC 129:1990 High-voltage switchgear and controlgear — A.C. disconnectors and earthing switches for voltages above 1 kV