Calculate the necessary length of material to form elbows, considering the inner radius and degree of the bend to minimize material stress. The method for producing bridge bend elbows is as follows: Take a 90-degree cable tray bend elbow as an example, and apply the same principles for 45-degree bends accordingly. The length of the bottom side (bottom diagonal) after bending the cable tray should be equal to the width of the cable. This manual is designed to guide workers through the detailed production process of ladder cable trays, including the manufacture of horizontal elbows, tees, crosses, reducing bends, and vertical bends, with emphasis on precision, safety, and quality control. The fold angle is AEF which will be half of FCB. Come to think of it, CB isn't right for the horizontal either. Drop a perpendicular down from F to CB, let it cross CB at B' and CB' = 170mm. What is the Cable Tray Slope & Fabrication Calculator? The Cable Tray Slope & Fabrication Calculator is a field-ready tool for electrical construction workers who need to quickly calculate. Our free calculator helps you determine the correct tray size based on NEC and IEC standards. Select Fill Standard: Choose 40% for power cables (NEC compliant) or 50% for.