Cable tray systems are also easy to install and maintain. Additionally, the trays can be easily accessed for maintenance, allowing for the replacement or repair of cables without disrupting the rest of. Cable tray systems are a way to manage cables. They create a path for cables and keep routes open for maintenance, ventilation and upgrades. What Is a Cable Tray System? A cable tray system is. An electrical cable tray is a type of containment system used to support insulated electrical cables for power distribution, control, and communication.