Abstract: A bypass device (3) having an electrical harness (4) for an aircraft cable raceway, the device being suitable for steering the trajectory of an electrical harness away from a cable guide channel of an aircraft cable raceway, the bypass device includes: a clip-on support base (5); a pad (13) opposite the support base (5), the pad (13) having a support groove; a central body (15) attached on one side to the support base (5) and on the other side to the pad (13), the central body (15) being suitable for being positioned opposite a cable guide channel when the bypass device (3) is attached to an aircraft cable raceway, the central body (15) having a bypass clamp (17) for the electrical harness; the support base (5) and the pad (13) being suitable for being attached to two side walls (1,2) adjacent to a guide channel of a cable raceway.