The cable tray selection depends on the number of cables, cable sizes, spacing between them, and total cable weight in the tray. As their name implies, these trays resemble ladders. Its structure consists of two longitudinal side rails connected by individual cross . cable trays are equivalent. The mechanical and electrical characteristics, tests, certifications, overall quality management, recommendations mentioned in this technical guide only apply to our own cable management ranges and cannot under any circumstances be transposed to si osure, overheating or. maintain spacing or to keep cables in place when the tray is ect the minimum bend ra-dius for cables as they exit the bottom of the cable tray. A rung spacing of 6 to 9 inches (150 to 230 mm) is preferable when the cable tray cont d for instrumentation and control applications that require. Cable tray (or cable ladder) systems are a popular alternative to electrical conduit systems, as they have an outstanding record for dependable service, design flexibility and cost savings in commercial and industrial applications. A properly designed and installed cable tray system will provide. It offers better cable support than ladder trays while still allowing airflow and drainage. Key parts: solid base & side walls It provides maximum protection against dust and debris and is often used for sensitive or data cables. Each cable tray type performs a different function and comes in various materials such as aluminum, galvanized steel, and FRP.