Channel trays are compact, U-shaped systems used for smaller cable runs. Key parts: channel body They are typically used for short distances or branch connections Cable tray fittings are used to change direction, create branches, and adapt the tray layout to the building. Cable trays consist of rigid components like supports, connectors, and fittings made of either certain steel alloys or aluminum materials. The right cable trays and fittings provide superior versatility, safety, cost-effectiveness, efficiency, and ease of installation. Learn more about the. 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. 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 additional protec eferred to support and protect numerous small. A ladder cable tray is one of the most common types. It consists of two side rails connected by rungs. A perforated cable tray has a continuous bottom with holes. All illustrations, descriptions and technical information included in this document are provided as indications and can cable trays are equivalent.