Conduit systems are enclosed pipes that require precise bends, threading, and pulling. Cable trays, on the other hand, create an. The decision on whether to use a cable tray or a conduit lies on the scale of the job as well as the amount of heat the wires will generate. It ensures that all installation activities follow authorized plans, specifications, and standards. The objective is to ensure safety, quality and compliance during the. Two proven approaches dominate: cable trays and conduits. From. Place 3 connectors, one in each of the 3 pre-punched hole positions on the top face of the panel board. In Properties, in the Diameter field, click Associate Family Parameter.