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?Choose a cable tray fitting with a radius equal to or greater than your calculated minimum. Knowing your cable's minimum bending radius will help prevent damage during installation. There are 4 factors that influence the. 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. How do we calculate the value of radius (R) of the circle in this attached sketch? Basically I am trying to prove that this cable can be pulled in this cable tray without the need of a. The right cable tray sizing calculator helps engineers turn cable schedules into a verified tray width and fill check before material ordering and site installation.