Support spacing for cable trays must align with the manufacturer's instructions, as outlined in NEC 392. Generally, standard trays require supports every 6 to 10 feet, while heavy-duty, long-span trays can handle distances of up to 20 feet between supports. Cable tray spacing is a critical aspect of electrical infrastructure, influencing both safety and efficiency. Whether you are working on power distribution systems, industrial installations, or commercial projects, adhering to cable tray spacing standards ensures smooth operations and minimizes. us-trations without notice. 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. Ladder cable tray is available in widths of 6, 9, 12, 18, 24, 30, 36, 42 and 48 inches with rung spacings of 6, 9, 12 or 18 inches. 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. 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 NEC has a requirement for ladder-type cable trays. The rungs cannot be more. Bearers shall be spaced evenly along the length of the bundle. Where shorter length products are packed in bundles, they shall be supported with a minimum of two timber bearers which provide sufficient clearance to accommodate the forks of a forklift truck.