Step-by-step on-site guide: learn how to plan, mark, support, and install cable trays correctly, from shop drawing approval to final checks. us/ The Practical Skills Series: Cable Tray How to Install TRAYCAB Cable Trays How to fabricate a swept 90 degree bend in cable tray. But before you lay the first tray or clamp down a single cable, you need a solid plan. This guide breaks down the process step by step. en completely installed, without damage either to conductors or structural system use maintain spacing or to keep cables in place when the tray is ect the minimum bend ra-dius for cables as they exit the bottom of the cable tray. When installed and engineered properly, cable. Cable tray installation implies the construction of an electric road that will be safe.