The paper describes a testing program em2loying biaxial, single and multi-frequency excitation toqualify metalclad switc ear following procedures recommended in IEEE 9 . By testing at high g levels and for a series of different RRSs immediate and future specifications are covered. Low level impedance tests were performed to gain a better understanding of the dynamic behavior of the equipment. Mechanical Impedance Modeling is used to create a mathematical model based directly on results obtained from fullscale tests. It is shown that the model accurately predicts the response of the equipment for a multiaxis Seismic excitation. The predicted device mountinglocation time-histories can be used in device testing of separate instruments. Aspects of the qualification process are critically reviewed in the paper. These considerations are broadly applicable to all Class IE equipment.
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