“…phase conductors, sheaths, armourings, additional conductors). In practice, we have that the fraction of fault current, returning to the feeding substation(s), through the earth I e (defined as “earth current”) is given by: In a very first approximation, r can be considered as a constant quantity depending only on the cable characteristics [2, 7, 8]; more refined approaches take into account, with much more precision, of the cable characteristics and, above all, of the position of the fault point along the power cable route [9, 10]. Nevertheless, these simplified approaches do not consider the earth over‐potential produced by the current injection into soil by the earthing electrodes present along the power cable and by the feeding station(s) earthing grids which is responsible of the conductive coupling with nearby metallic structures.…”