A perforated cable tray—also called a ventilated trough tray —features a solid bottom with regularly spaced ventilation holes and continuous side rails. It is. Cable tray systems are engineered support structures designed to route, support, and protect insulated electrical cables used for power distribution, control, instrumentation, and communication. Today, electrical cable trays have become an essential component in industrial and commercial construction, providing a quick, economical, and. anufactured using a pultrusion process that uses polyester resin or vinyl ester. It provides good corrosion resistance in many corrosive environments.