Only specific cable types are permitted to be installed in cable trays, as defined by applicable codes. Examples include: Power and lighting cables with tray ratings. NEC section 300-8 does not permit any tube, pipe, or equal for water, air gas, drainage, steam, or any service other than electrical in raceways or cable trays containing. 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. A cable tray is a metal or non-metal structure used to lay electrical cables and wires, serving to support, protect, and guide the cables. What is the role of a cable tray in electrical engineering? A cable tray allows for the neat and aesthetic arrangement of cables, improves the reliability. Common types of cable trays include: Side rails connected by transverse rungs. Bottom with slots or holes for ventilation and drainage. Unlike standard electrical cables, tray cables feature enhanced insulation and jacketing to withstand mechanical stress and exposure to oil, sunlight. Installation of Cable in Cable Trays involves precise routing on support systems, NEC/IEC compliance, grounding, ampacity derating, bend radius control, segregation of services, fire safety, labeling, and reliable cable management for industrial and commercial facilities.