[en] To obtain an homogeneous temperature in a cylindrical model during a heating process using Joule effect, it is shown that is necessary to introduce secondary electrodes. Neglecting the electrical and thermal resistances at the interface between these secondary electrodes and the sample, it is possible to find an analytical expression of the homogeneous fraction of the whole system. Then it is possible to solve the problem of the length of the secondary electrodes. To take the thermal and the electrical contact resistance into account, a numerical model is used and percent temperature deviations are calculated. Simulation show that secondary electrodes made of the same material as the sample are preferable to other secondary electrodes ant it is shown that is better to choose a high current intensity