Cable tray and cable ladder systems are an ideal alternative to electrical conduit systems. 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. In industrial settings, electrical and instrumentation (E&I) cable trays or bridge racks play a critical role in organizing and supporting power, control, and signal cables across facilities. Why use cable tray? A properly designed and installed cable tray system provides outstanding reliability for a facility's control, communication, data, instrumentation and power systems cabling and wiring. in this document have been tested extens ompetent professional en completely installed, without damage either to conductors or structural system use 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 poor choice can lead to signal interference, difficult. The Cable Tray Institute (CTI) was founded in 1991 to support the cable tray industry by engaging in research, development, education, and the dissemination of information designed to promote, enhance, and increase the visibility of the industry. Cable tray, introduced in the mid 1940s, is a safe.