Use in data centers, the equipment room, and telecommunications room to provide racking, cable management, and grounding for network hardware. Modular System: Easily Configured for New and Existing Cable Routing. Each cable tray type performs a different function and comes in various materials such as aluminum, galvanized steel, and FRP. What is Cable Tray? A cable tray is a unit, or set of units. association representing the major electrical equipment manufac-turers in the U. The Cable Tray ng standards, performance standards, test standards and application in this document have been tested extens ompetent professional en completely installed, without damage either to conductors or. us-trations without notice.