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The medium-voltage part must be maintenance-free and independent of environmental influences.
In order to achieve a long service life of the switchgear, all panels must be routine-tested for partial discharge. The partial discharge must not exceed the value of 20 pC at 1.1 x UN.
The switchgear is to be designed with resistance to internal faults, which means that it fulfills the criteria 1 to 5 of IEC 62271-200, arc duration 1 second. The internal arc classification for the protection of operating personnel must be verified for all accessible sides of the switchgear according to IEC 62271-200. A corresponding IAC classification is to be presented.
All switching devices are operated at the panel front. The operating states are to be displayed through mechanical position indicators. The vacuum circuit-breakers must be controllable from remote.
All medium-voltage components of the switchgear must be enclosed hermetically and safe to touch.
Capacitive voltage taps (capacitive voltage dividers) in the bushings to the cable feeder shall enable the verification of safe isolation from supply at the panel front without danger. The degree of protection of the switchgear must not be reduced thereby.