In this case study, seismic category I class electrical equipment in NPP was manufactured and a modal testing was performed using an impact hammer to measure the dynamic characteristics. In the case of electrical cabinets, various safety related components are mounted in the internal frame. Therefore, FEM model that appropriately reflects the local mode is required. To reflect both global and local mode to FEM model, modal testing should be carried out. For implementing the global mode, accelerometers were installed at twenty-eight points of the outline plate edge, and responses for local mode were measured at seven crucial points and compared those results.