scope:

This part of IEC 62271 applies to alternating current disconnectors and earthing switches, designed for indoor and outdoor installations for nominal voltages above 1 000 V and for service frequencies up to and including 60 Hz. It also applies to the operating devices of these disconnectors and earthing switches and their auxiliary equipment. Additional requirements for disconnectors and earthing switches in enclosed switchgear and controlgear are given in IEC 62271-200, IEC 62271-201 and IEC 62271-203. NOTE - Disconnectors in which the fuse forms an integral part are not covered by this standard. This document is also applicable to switching devices having disconnecting and/or earthing functionalities apart from other functions, such as high-speed earthing switch, circuit-breaker and switch-disconnector. This edition includes the following significant technical changes with respect to the previous edition: <ol style="list-style-type:lower-alpha"> <li>new numbering according to IEC 17/1025/RQ to harmonize with ISO/IEC Directives, Part 2, and IEEE Std. C37.100.1;</li> <li>clause numbering has been aligned with IEC 62271-1:2017;</li> <li>the Scope has been extended to cover all indoor and outdoor installations. Consideration of switching devices having disconnecting and/or earthing switch functionalities, apart from other functions, are also covered by this document;</li> <li>ratings have been moved from Annexes B, C and E to Clause 5; the order of the subclauses now corresponds to the order of subclauses in Clause 7;</li> <li>new rating values for bus-transfer current and bus-transfer voltage have been assigned;</li> <li>new class of mechanical endurance for earthing switches has been added (M1);</li> <li>subclause "Rated values of electrical endurance for earthing switches" is now called "Classification of earthing switches for short-circuit making capability";</li> <li>new subclause with ratings for ice-coating has been added;</li> <li>new subclause with classification of bus-charging switching capability has been added;</li> <li>new withstand requirements for interlocking devices have been added;</li> <li>the way to comply with the requirements of the isolating distance of disconnectors has been modified;</li> <li>design and construction requirements for position-indicating devices have been modified, aligning the requirements for position indication and signalling;</ ...