Best practice guide to cable ladder and cable tray
Cable ladder and cable tray systems The following recommendations are intended to be a practical guide to ensure the safe and proper installation of
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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. 8 (Other Mechanical Stresses (AJ)) in that document provides requirements for cable support. This spacing is crucial for adequate maintenance access, ease of inspection, and ensuring proper airflow for effective heat dissipation. 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. They should never be permanently enclosed, and if they pass through walls or partitions, proper fire-stopping measures must be in place to prevent the spread of fire.