The magnetic field produced by alternating currents flowing in the bus-bars of switchgears induces eddy currents in the metal parts nearby. The metal enclosure around these bars is also exposed to this magnetic field, therefore currents, namely power losses within it are ineluctable. Depending on the material and the switchgear's geometry, the non-uniform current density-, hence the power loss distribution and the total loss can be different in the different phase conductors and in the enclosure. As the analytical modeling of a complex geometry is practically impossible, another approach should be adopted to determine these parameters. This can be the finite element (FE) calculation method. The results of such calculations on the 2D models of one high voltage and one medium voltage GIS are presented in this paper.