Several types of tray are used in different applications. A solid-bottom tray provides the maximum protection to cables, but requires cutting the tray or using fittings to enter or exit cables. A deep, solid enclosure for cables is called a cable channel or cable trough. A ventilated tray has openings in the bottom of the tray, allowing some air circulation around the cables, water drainage, and allowing some dust to fall through the tray. Small cables may exit the tray throug.
The distance between hangers should typically not exceed 1. 5 meters, although this can vary depending on the tray type and load. Fixed supports are critical for the overall stability and safety of the cable tray system. 8 (Other Mechanical Stresses (AJ)) in that document provides requirements for cable support. Clause 522-08-04 Where conductors or cables are not supported. Based on "Code for Acceptance of Construction Quality of Building Electrical Engineering" GB50303 and "Specification for Design of Steel Cable Tray Engineering" CECS31 Actual width of the cable tray. Common values: 50, 100, 150. The NEC requires that cable trays must be supported by members at an interval specified by the cable tray manufacturer, but not more than 5 feet for horizontal runs to support the weight of the cables and other loads. The rungs cannot be more. 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.
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