A monitoring system, to monitor the condition of an industrial wiring system provided with a hybrid multipolar electric cable having a number of electric conductors (21, 22) having a power transmission and data transmission functions and enclosed inside a protective sheath, comprising: monitoring conductors (27a, 27b), to monitor wear of the electric cable, arranged inside said protective sheath and electrically insulated from said electric conductors (21, 22); and a monitoring device, operatively coupled to said monitoring conductors (27a, 27b) and configured to detect at least one electric parameter associated with said monitoring conductors (27a, 27b) in order to detect the wear of the electric cable and generate corresponding monitoring data, wherein said monitoring device is configured to obtain its own power supply from electric conductors (21, 22) of said electric cable, and to transmit said monitoring data by means of electric conductors of said electric cable; wherein said monitoring device comprises a power supply unit coupled to said electric conductors (21, 22) in order to obtain the power supply from at least one of said electric conductors; a signal conditioning stage, coupled to said monitoring conductors (27a, 27b) in order to detect said at least one electric parameter associated with said monitoring conductors, in order to detect the wear of the electric cable; a central unit, coupled to said power supply unit in order to receive said power supply, and coupled to said signal conditioning stage so as to generate the monitoring data indicative of the wear of said electric cable according to said at least one electric parameter; a local memory, coupled to said central unit and configured to store said monitoring data; and a transmission and reception stage coupled to at least one of said electric conductors for the transmission of said monitoring data. monitoring conductors (27a, 27b), to monitor wear of the electric cable, arranged inside said protective sheath and electrically insulated from said electric conductors (21, 22); and a monitoring device, operatively coupled to said monitoring conductors (27a, 27b) and configured to detect at least one electric parameter associated with said monitoring conductors (27a, 27b) in order to detect the wear of the electric cable and generate corresponding monitoring data, wherein said monitoring device is configured to obtain its own power supply from electric conductors (21, 22) of said electric cable, and to transmit said monitoring data by means of electric conductors of said electric cable; wherein said monitoring device comprises a power supply unit coupled to said electric conductors (21, 22) in order to obtain the power supply from at least one of said electric conductors; a signal conditioning stage, coupled to said monitoring conductors (27a, 27b) in order to detect said at least one electric parameter associated with said monitoring conductors, in order to detect the wear of the electric cable; a central unit, coupled to said power supply unit in order to receive said power supply, and coupled to said signal conditioning stage so as to generate the monitoring data indicative of the wear of said electric cable according to said at least one electric parameter; a local memory, coupled to said central unit and configured to store said monitoring data; and a transmission and reception stage coupled to at least one of said electric conductors for the transmission of said monitoring data.