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The international norms recommend verification of the circuit breakers seismic capability by tests on seismic platform, but accept assessment through experimental and theoretical combined analysis, too. The paper presents a methodology for seismic capability assessment of the high voltage electric equipments using combined analysis through experimental modal analysis methods. The methodology was applied on some representative types of circuit breakers and disconnecting switchers situated in the working place. The same methodology was applied on a circuit breaker type IO 220 kV/2500A, situated on seismic platform from SC EUROTEST SA Bucharest, after finishing the tests with vibratory signals applied to the base. The equipment, in the same mounting conditions, was tested by means of the present methodology. Were determined the frequency response functions, modal parameters, and theoretical response of some representative points to theoretical vibratory motions applied to base, the same as applied during the direct experimental tests. At the end of paper it is effectuated the comparative analyses of the results obtained through the two methods: direct tests on seismic platform and combined analysis by modal analysis methods.