A inserting system of at least an electrical cable internally of a protective tube, comprising: a channel arranged in such a way that a relative first end thereof is at a lower height than a relative second end thereof, which is opposite the first end; first motor means arranged and configured so as to introduce a protective tube internally of the channel from the second end of the channel and inserting the protective tube internally of the channel for at least a first portion of the channel; a first guide which is interposed between the first motor means and the second end of the channel, for guiding the protective tube internally of the channel; the protective tube comprising a third end and being introduced and inserted internally of the channel from the relative third end thereof; the arrangement of the channel being chosen in such a way that once the protective tube has been inserted for at least the first portion of the channel, the force of gravity acting on the protective tube is sufficient in itself to insert the protective tube internally of the channel; first cutting means which are arranged so as to cut the protective tube in proximity of or at the second end of channel; the protective tube comprising a fourth end which is opposite the third end and which is arranged at a greater height with respect to the third end; second motor means arranged and configured to introduce at least an electrical cable internally of the protective tube from the fourth end of the protective tube and for inserting the at least an electrical cable internally of the protective tube for at least a third portion of the channel; a second guide which is interposed between the second motor means and the second end of the channel, for guiding the at least an electrical cable internally of the protective tube; the arrangement of the channel and of the protective tube internally of the channel being chosen in such a way that once the at least an electrical cable has been inserted for at least the third portion of the protective tube the force of gravity acting on the at least an electrical cable is sufficient for inserting the at least an electrical cable internally of the protective tube; second cutting means which are arranged so as to cut off the at least an electrical cable in proximity of or at the fourth end of the protective tube; the at least an electrical cable comprising a sixth end which is opposite the fifth end and which is arranged at a greater height than the fifth end. a channel arranged in such a way that a relative first end thereof is at a lower height than a relative second end thereof, which is opposite the first end; first motor means arranged and configured so as to introduce a protective tube internally of the channel from the second end of the channel and inserting the protective tube internally of the channel for at least a first portion of the channel; a first guide which is interposed between the first motor means and the second end of the channel, for guiding the protective tube internally of the channel; the protective tube comprising a third end and being introduced and inserted internally of the channel from the relative third end thereof; the arrangement of the channel being chosen in such a way that once the protective tube has been inserted for at least the first portion of the channel, the force of gravity acting on the protective tube is sufficient in itself to insert the protective tube internally of the channel; first cutting means which are arranged so as to cut the protective tube in proximity of or at the second end of channel; the protective tube comprising a fourth end which is opposite the third end and which is arranged at a greater height with respect to the third end; second motor means arranged and configured to introduce at least an electrical cable internally of the protective tube from the fourth end of the protective tube and for inserting the at least an electrical cable internally of the protective tube for at least a third portion of the channel; a second guide which is interposed between the second motor means and the second end of the channel, for guiding the at least an electrical cable internally of the protective tube; the arrangement of the channel and of the protective tube internally of the channel being chosen in such a way that once the at least an electrical cable has been inserted for at least the third portion of the protective tube the force of gravity acting on the at least an electrical cable is sufficient for inserting the at least an electrical cable internally of the protective tube; second cutting means which are arranged so as to cut off the at least an electrical cable in proximity of or at the fourth end of the protective tube; the at least an electrical cable comprising a sixth end which is opposite the fifth end and which is arranged at a greater height than the fifth end.