Keeps Cables Cool and Saves Money 2 2. Saves Space Above the Ceiling 8 8. 1 Do cable trays need to be grounded?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. 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. Suppose that they are a robust bridge or a shelf, which is developed with electrical cords in mind. The cable trays do not build the wires in the thick pipes but rather leave them out in the open so that they can be seen and. In industrial settings, electrical and instrumentation (E&I) cable trays or bridge racks play a critical role in organizing and supporting power, control, and signal cables across facilities.