Common types of cable trays include: Side rails connected by transverse rungs. Provide good ventilation and easy cable tie-down. The selection of material and finish is a function of the environment in wh tant in a wide range of environments, and easily formable (Appendices II and III). Aluminum's exceptional corrosion resistance, particularly. This publication is intended as a practical guide for the proper and safe* installation of cable ladder systems, cable tray systems, channel support systems and associated supports. es in the industrial environment. Our cable support. Cable tray systems are engineered support structures designed to route, support, and protect insulated electrical cables used for power distribution, control, instrumentation, and communication.