Cable tray systems are recognized as a wiring method by many national and international electrical codes. Typical requirements address: Tray construction, load ratings, and materials. When properly selected and installed, cable trays simplify routing, improve accessibility, and support future expansion while. Method Statement installation of Cable Trays and Ladders - Planning Engineer FZE. The Cable Tray system is installed in electrical rooms, plant rooms, and service. Cable tray installation must comply with specific technical standards to ensure electrical safety, system reliability, and long-term maintainability.