###### Abstract  
Given the critical role of electrical cabinets in the post-earthquake recovery and emergency response of nuclear power plants (NPPs), a comprehensive assessment of their seismic performance is essential to ensure operational safety. This study analyzed seismic behavior by fabricating an electrical cabinet model based on the dynamic characteristics and field surveys of equipment installed in a Korean-type NPP. A shaking table test with simultaneous tri-axial excitation was conducted, incrementally increasing the seismic motion until damage was observed. A numerical model was then developed based on the experimental results, followed by a seismic response analysis and comparison of results. The findings verified that assuming fixed anchorage conditions in the numerical model may significantly overestimate seismic performance, as it fails to account for the nonlinear behavior of the anchorage system, as well as the superposition between global and local modes caused by cabinet rocking and impact under strong seismic loading. Furthermore, damage and impact at the anchorage amplified acceleration responses, significantly affecting the high-frequency range and the vertical behavior, leading to substantial amplification of the in-cabinet response spectrum. electrical cabinet; shaking table test; numerical analysis; acceleration amplification; seismic behavior 2020 IEEE/RSJ International Conference on Intelligent Systems (IEEE), Vol., No., No. Experimental studies have been conducted to evaluate the seismic performance of electrical cabinets installed in critical facilities, such as telecommunication systems, that are designed to maintain essential functions [12; 13]. Further experimental research has aimed to enhance seismic performance through cabinet base reinforcement, using tuned mass dampers, and analysis of cabinet grouping effects [14; 15; 16]. However, comprehensive experimental evaluations covering a broad range of seismic parameters, such as various seismic waves, require considerable financial investment. Furthermore, testing in-service equipment is often subject to operational limitations, including the need for system shutdown or component disassembly. Therefore, numerical studies based on shaking table test results are generally conducted to account for multiple seismic parameters cost-effectively and practically [17; 18; 19; 20; 21; 22]. The base frame of an electrical cabinet, having lower rigidity than its main structural members, is typically mounted to a concrete foundation using anchor bolts. These cabinets may experience torsional effects under seismic loading [23]. In addition, as shown in Figure 1, rocking behavior can occur due to uplifting caused by cup-like deformation of the base frame around the anchor bolts. The dominant seismic behavior includes global modes in the two horizontal directions, which manifest as rocking coupled with bending [24; 25]. These dynamics have been explored in previous studies [22; 25; 26; 27]. As shown in Figure 2, cabinets without anchorage typically fail by overturning, whereas those firmly anchored tend to fail through anchor bolt rupture or concrete cracking, often accompanied by rocking [1; 28]. Rattling, banging, and internal impacts are also induced by the uplifting and rocking of the cabinet. These impacts can significantly amplify the in-cabinet response spectrum (ICRS), particularly in the high-frequency ranges above 20 Hz [17; 29]. Given the high sensitivity of cabinet systems to high-frequency excitation, such amplified responses may adversely affect the structural integrity and functional reliability of internal devices, potentially introducing new failure modes and functional issues [30]. These amplifications vary spatially within the cabinet, peaking where global and local modes interact or where local modes dominate due to internal impacts [31]. Therefore, accurately reflecting the realistic seismic behavior in numerical models is essential when evaluating the seismic performance of electrical cabinets using numerical methods.