Calculate the minimum required bend radius by multiplying the cable's outside diameter by its bending factor (e. Then, select a standard tray fitting (300mm, 450mm, etc. ) that matches or exceeds this value. How to calculate cable bending?This publication is intended as a practical guide for the proper and safe* installation of cable ladder systems, cable tray systems, channel support systems and associated supports. 5 degree of cable tray 3 layer with the same distance and gap • HOW TO BEND 22. Different sizes of cable tray what is the travel tips. Stop Costly Cable Tray Installation Errors Now: Avoiding Mistakes in Instrumentation Cable Tray Installation: A Guide for EPC Projects Cable tray sizing in real EPC projects is not limited to simple area calculation. Additional engineering factors must be considered to ensure safety, reliability. Correct sizing prevents sagging, overheating, and premature failure. You don't need a PhD—just a consistent method. This step‑by‑step approach helps you determine width, depth, support spacing, and allowable load with confidence. Ladder tray comes in nominal widths of: 150 (6"), 203 (8"), 300 (12"), 600 (24"), 450 (18"), 750 (30") and 900 (36") mm.