The clip has a shape, which is roughly rectangular, formed by a pair of longitudinal sides (3a,3b,3c) and a pair of transverse sides (3d,3e). Each clip has a slot (4), which opens onto one of the longitudinal sides and is designed for the introduction and securing of the wires (1,2). The slot extends towards the inside of the clip and has a general zig zag form. The slot is composed of the entry area (4a), which is inclined in a primary direction, relative to the longitudinal side of the clip and leads into an intermediate area (4b), which is inclined in a secondary opposing direction to the primary direction. This area leads to an extreme internal area (4c), which is inclined in the same direction as the entry area and forms a primary extremity (4d), against which the primary wire (1) is pressed. It also forms a secondary extremity (4e), against which the second wire (2) is pressed.
