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Earthquake-resistant design of the switchgear

The switchgear has to be upgraded for regions at risk from earthquakes.

Earthquake qualification testing is carried out in accordance with the following standards:

IEC 60068-3-3 "Guidance – Seismic test methods for equipment"
IEC 60068-2-57 "Test Ff: Vibration – Time-history method"
IEC 60068-2-6 "Test Fc: Vibration (sinusoidal)"
IEEE 693-2005 "Recommended Practice for Seismic Design of Substations"
IEEE 344-2004 "IEEE Recommended Practice for Seismic Qualification of Class 1E Equipment for Nuclear Power Generating Stations"
IEEE C37-81-1989 "IEEE Guide for Seismic Qualification of Class 1E Metal-Enclosed Power Switchgear Assemblies"
IEC 60980-1989 "Recommended practices for seismic qualification of electrical equipment of the safety system for nuclear generating stations".

For installation on even and rigid concrete or steel structure (without considering building influences), the tested ground accelerations meet the following requirements:

Uniform Building Code 1997 (UBC) – Zone 4
California Building Code 1998 (CBC) – Zone 4
International Building Code 2006 (IBC) – 200 %
American Society of Civil Engineers 2005 (ASCE) – 200 %
IEEE 693-2005 – High required response spectrum (Figure A.1).

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