Cable trays are structural support systems designed to organize, protect, and route electrical cables in industrial and commercial environments. They provide a safe pathway for power, control, and communication cables while improving ventilation and simplifying maintenance. As a professional. Below are 100 questions that comprehensively cover the basic definitions, material classifications, selection principles, load capacities, installation methods, fire protection requirements, corrosion treatments, and wiring techniques of cable trays, aimed at providing a detailed and comprehensive. Cable trays should be used to hold and structure wires in large buildings.