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[en] Highlights: • 3D electromagnetic modelling of the JT60-SA tokamak has been carried out. • Frequency-domain electromagnetic characterization of active coils has been achieved. • Plasma response has been included so as to self-consistently study resistive wall modes with 3D conductors. - Abstract: This paper reports the results of detailed 3D modelling of the JT60-SA tokamak. Different computational tools have been used, ranging from a purely electromagnetic description to models including the plasma response. Detailed 3D finite elements meshes have been developed, including key conducting structures of JT60-SA. The positive comparison of results produced with different assumptions and independent codes increases confidence in results. Frequency-domain electromagnetic characterization of active coils has been achieved, as well as resistive wall modes growth rate computation.