This guide covers the critical steps, from selecting the right electrical cable tray and performing accurate cable fill calculations to managing a safe cable pull through and ensuring all bonding and grounding requirements are met. 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. You must start by looking at your site layout. Make sure you avoid high-heat areas. - The steps for. 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. The Cable Tray system is installed in electrical rooms, plant rooms, and service corridors.