Some outdoor cable tray installations may have to span anywhere from 20 to 40-feet to cross roads. Extra-long spans are also used to help reduce the required number of expensive outdoor supports. The spacing between trays, whether horizontal or vertical, depends on various factors like cable type, environment, and tray material. One of the most recognized frameworks globally is the IEC standard for. The National Electrical Manufacturers Association (NEMA) also publishes three consensus standards that apply to the proper manufacture and installation of cable trays: ANSI/NEMA-VE 1-1998, Metal Cable Tray Systems; NEMA-VE 2-1996, Metal Cable Tray Installation Guidelines; and NEMA-FG-1998. us-trations without notice. 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. Basis of calculations and performance Cable support systems are generally designed with at least 50 % reserve.
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