When transitioning cables from a tray to equipment or another raceway, the unsupported span cannot exceed 6 feet. This spacing is crucial for adequate maintenance access, ease of inspection, and ensuring proper airflow for effective heat dissipation. It also helps reduce the risk of. NEC Article 392 outlines the key rules for installing and maintaining industrial cable tray systems. The following pages address the 2014 National Electrical Code® requirements for cable tray systems as well as design. cable trays are equivalent. The mechanical and electrical characteristics, tests, certifications, overall quality management, recommendations mentioned in this technical guide only apply to our own cable management ranges and cannot under any circumstances be transposed to si osure, overheating or. When power and low voltage cables cross, it is recommended to use a vertical crossing approach. The minimum clearance at the crossing point should be 150mm, and additional insulation measures should be taken at the crossing point, such as using metal partitions or shielding with foil paper.
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