System for locking two sections (2, 3) of a cable raceway, the system defining a longitudinal reference axis and comprising first, "male" locking means that can be borne by a first section, the male means comprising an eye of height H e positioned on a reference plane passing through the reference axis, the eye being defined between an upper edge and a lower edge, the lower edge coinciding with the reference axis, the eye comprising two portions (23, 24) that are inclined in the longitudinal direction, wherein these two portions (23, 24) depart from the reference plane and meet at a flat portion that is essentially parallel to the reference plane, the flat portion extending transversely beyond the reference axis, from the lower edge, in the form of a tongue of height H l, extending as far as a free end, the locking system also comprising "female" means that can be borne by a second section, the female means comprising an opening between an upper edge and a lower edge on either side of the reference axis, the upper edge being positioned at a distance, from the reference axis, which is greater than or equal to the height H e of the eye, and the lower edge defining two portions: - a first portion in which the lower edge is at a distance, from the reference axis, greater than or equal to the height H l of the tongue; - a second portion in which the lower edge is at a distance, from the reference axis, less than the height H l of the tongue; these dimensions of the opening of the female means, and of the tongue of the male means, being such that they allow the tongue of the male means to slide from the first portion of the opening to the second portion, so as to immobilize the second section with respect to the first, this locking system being characterized in that - the male means further comprise a tab which extends, from the reference plane, on the same side of said reference plane as the flat portion, in a longitudinal direction from a first edge on the reference plane, extending away from said flat portion, as far as a second, free end oriented away from the eye; - the female means further comprise a window which is aligned with the reference axis and of which the transverse dimension is greater than or equal to the height H t of the male means, this being the greatest of the dimensions measured transversely either between the upper edge of the eye and the free end of the tongue, or between the upper edge of the eye and a lower edge of the tab. - a first portion in which the lower edge is at a distance, from the reference axis, greater than or equal to the height H l of the tongue; - a second portion in which the lower edge is at a distance, from the reference axis, less than the height H l of the tongue; - the male means further comprise a tab which extends, from the reference plane, on the same side of said reference plane as the flat portion, in a longitudinal direction from a first edge on the reference plane, extending away from said flat portion, as far as a second, free end oriented away from the eye; - the female means further comprise a window which is aligned with the reference axis and of which the transverse dimension is greater than or equal to the height H t of the male means, this being the greatest of the dimensions measured transversely either between the upper edge of the eye and the free end of the tongue, or between the upper edge of the eye and a lower edge of the tab.