You can buy a manufactured 90 degree bend or make one on a cable tray bending machine but in this video I show you how to make one using a metal bar. Students trading aid on how best to put an internal 90 degrees bend in steel cable tray. By following these steps, you can minimize the risk of damage to the cable tray and ensure a smooth bending experience. When a wire cable tray is cut, the fact that a. I am an apprentice electrician and looking knowledge on how to create a 90° bend on a cable tray suitable for SWA.