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In this paper, we analyze the electromagnetic fields in the Joint European Torus (JET) tokamak taking into account the effects of its three-dimensional (3-D) metallic structures. The systems considered here that interact with the plasma are basically the vacuum vessel, the magnetic circuit, and the active poloidal field (PF) coils. The first two have important 3-D effects that may cause significant deviations from purely axisymmetric estimates. The numerical results will be compared to the experimental data and will give indications for the tuning of approximate equivalent axisymmetric models.