Apparatus for stringing cables, comprising: a work unit carrying at least one rotating device to support and tension the cables provided with at least one pair of capstans; a unit for winding and unwinding the cables provided with at least one reel for winding and unwinding the cables; a regulation and safety hydraulic circuit in which a work fluid flows and with which at least said work unit and said unit for winding and unwinding the cables are associated, said apparatus being characterized in that it comprises: at least a first regulation unit associated with said work unit and provided with: at least one proportional valve with reverse logic for regulating and setting the pressure of the hydraulic circuit and for drawing the cables to the capstans, said proportional valve with reverse logic being configured to move to the position of maximum closure, that is, to the maximum pressure of the regulating range, once the piloting of the valve itself fails; and at least one protection valve for the hydraulic circuit configured to limit the maximum pressure in the hydraulic circuit; and at least a second regulation unit associated with said unit for winding and unwinding the cables and provided with: at least one proportional valve with reverse logic for regulating and setting the pressure of the hydraulic circuit and for drawing the cables to the reel, said proportional valve with reverse logic being configured to move to the position of maximum closure, that is, to the maximum pressure of the regulating range, once the piloting of the valve itself fails; and at least one protection valve for the hydraulic circuit configured to limit the maximum pressure in the hydraulic circuit. a work unit carrying at least one rotating device to support and tension the cables provided with at least one pair of capstans; a unit for winding and unwinding the cables provided with at least one reel for winding and unwinding the cables; a regulation and safety hydraulic circuit in which a work fluid flows and with which at least said work unit and said unit for winding and unwinding the cables are associated, said apparatus being characterized in that it comprises: at least a first regulation unit associated with said work unit and provided with: at least one proportional valve with reverse logic for regulating and setting the pressure of the hydraulic circuit and for drawing the cables to the capstans, said proportional valve with reverse logic being configured to move to the position of maximum closure, that is, to the maximum pressure of the regulating range, once the piloting of the valve itself fails; and at least one protection valve for the hydraulic circuit configured to limit the maximum pressure in the hydraulic circuit; and at least a second regulation unit associated with said unit for winding and unwinding the cables and provided with: at least one proportional valve with reverse logic for regulating and setting the pressure of the hydraulic circuit and for drawing the cables to the reel, said proportional valve with reverse logic being configured to move to the position of maximum closure, that is, to the maximum pressure of the regulating range, once the piloting of the valve itself fails; and at least one protection valve for the hydraulic circuit configured to limit the maximum pressure in the hydraulic circuit. at least a first regulation unit associated with said work unit and provided with: at least one proportional valve with reverse logic for regulating and setting the pressure of the hydraulic circuit and for drawing the cables to the capstans, said proportional valve with reverse logic being configured to move to the position of maximum closure, that is, to the maximum pressure of the regulating range, once the piloting of the valve itself fails; and at least one protection valve for the hydraulic circuit configured to limit the maximum pressure in the hydraulic circuit; and at least a second regulation unit associated with said unit for winding and unwinding the cables and provided with: at least one proportional valve with reverse logic for regulating and setting the pressure of the hydraulic circuit and for drawing the cables to the reel, said proportional valve with reverse logic being configured to move to the position of maximum closure, that is, to the maximum pressure of the regulating range, once the piloting of the valve itself fails; and at least one protection valve for the hydraulic circuit configured to limit the maximum pressure in the hydraulic circuit.