This part of IEC 62271 applies to gas-insulated switchgear assemblies for alternating current
of rated voltages above 52 kV for indoor and outdoor installations, including their supporting
structure.
For switchgear devices, e.g. live tank circuit breakers, IEC/TR 62271-300 is applicable.
Guidance on interactions between the supporting structure and the soil / foundations is
provided in Annex B.
The seismic qualification of the switchgear assemblies takes into account testing of typical
switchgear assemblies combined with methods of analysis. Mutual interaction between
directly mounted auxiliary and control equipment and switchgear assemblies are covered.
The seismic qualification of switchgear assemblies is only performed upon request.