The standard NEMA lengths for cable tray are 12, 20, 24 and 30-feet, although some manufacturers like Eaton offer cable tray in lengths up to 40 feet. All illustrations, descriptions and technical information included in this document are provided as indications and can cable trays are equivalent. The mechanical and electrical characteristics, tests, certifications, overall quality management, recommendations mentioned. 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. SWIFTS CABLE TRAY SYSTEMS Selectn chart 12-15 Straght length cler and ittng Lght dt SS 16-17 ed dt RF 18-19 ea dt SRF 20-21 Etra hea dt RF 22-23 Srt ancllar te cover and atener 24-27 SWIFTRACK CHANNEL SUPPORT SYSTEM Channel and channel nt 28 Cantlever ar 29 Fraewr bracet cla and accere 30-31. A cable support system consists of cable support lengths and system components, such as cable support fittings, support elements, mounting elements and system acces-sories. The cable support lengths and fittings can basically be designed as cable trays, cable ladders or mesh cable trays, in which. In practice, cable tray dimensions are a system of interrelated measurements —width, depth, length, and material thickness—that directly affect cable fill compliance, heat dissipation, structural loading, and long-term expandability.