Opposite to the inside bend, the vertical outside bend guides the cable tray downward, from a higher to a lower level. Bending Process: The tray is bent upward at the necessary angle, ensuring a smooth, gradual transition that minimizes stress on the cables. Be the first to get exclusive content straight to your email. You can unsubscribe at any time. Devices. Cable tray bends are designed to guide cables around obstacles, changes in direction, or elevations in an electrical system. The Ladder Tray features light, rugged, tubular steel construction. It is designed for. According to the National Electrical Code standard of the United States, a cable tray is a unit or assembly of units or sections and associated fittings forming a rigid structural system used to securely fasten or support cables and raceways.