A spillover fitting is positioned on an upstanding side of a lateral cable trough. The spillover fitting includes a first exit path having a first curved surface that extends at least partially over a base of the lateral cable trough, and a bottom wall having a second curved surface intersecting with the first curved surface. The first surface curves upward relative to the base of the lateral cable trough and defines a top surface of a cable path, and the second surface is convexly curved and defines a bottom surface of the cable path. The radius of curvature of the first curved surface is equal to the radius of curvature of the second curved surface.