Calculate cable tray bend dimensions, centerline arc lengths, setback distances, and offset configurations. Students trading aid on how best to put an internal 90 degrees bend in steel cable tray. 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 on. Every data center requires numerous cable tray bends and drops—sometimes thousands in just one installation. No. The bends, tees, crosses, risers and reducers of wire mesh cable tray can be easily and quickly made live at the project by using a bolt cutter. Resources for electrical engineering professionals.