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IEC/TR 62271-300 Ed. 1.0 b:2006
High-voltage switchgear and controlgear - Part 300: Seismic qualification of alternating current circuit-breakers
"This technical report applies only to circuit-breakers with their supporting structures which are rigidly connected with the ground, and does not cover the seismic qualification of circuit-breakers in metal enclosed switchgear."
International Electrotechnical Commission [iec]