The engageable stretch of cable trays of the present invention comprises a base (2) and vertical walls (3) provided with tubular rims (4) at their upper part, said stretches (1) comprising a depressed part (5) which is inserted in an adjacent stretch for their engagement to each other, and it is characterised in that said stretch (1) comprises a cut (6) at each of the vertical walls (3) at said depressed part (5), said cuts covering the ends of said tubular rims (4).;The engagement between adjacent stretches is more comfortable, because the flat part of the cut facilitates the entrance of the depressed end of a stretch inside the natural end of the adjacent stretch by an starting slight rotation.
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