If you need to run cable or cords through a ramp, consider the Pyle Pro PCRBDR27. This is a waterproof, rubber curb ramp made from industrial-strength molded plastic, designed to allow cables to pass under a curb.
With its angle of 4.1" and textured finish to reduce friction, this cable ramp is suitable for uneven curbs, home driveways, garages, sidewalks, or anywhere else where there might be lightweight car or forklift traffic. Its load capacity is 6600 lb. This package comprises a pair of ramps.