Cable trays are used as an alternative to open wiring or electrical conduit systems, and are commonly used for cable management in commercial and industrial construction. They are designed to accommodate and support multiple cables, providing a systematic approach to wiring. Below are the top 7 types of cable trays and their applications, along with their key advantages. Why Bother with the Right Types of Cable Trays Anyway? You might be tempted to just grab any old tray, but taking a moment to choose correctly pays off, trust me. Each cable tray type performs a different function and comes in various materials such as aluminum, galvanized steel, and FRP.