Height Above Ground: Cable trays should ideally be installed at least 2. 3 meters from the ceiling or any other obstructions. The following pages address the 2014 National Electrical Code® requirements for cable tray systems as well as design. Horizontal Runs: Cables should be secured at their start, end, and turns, and every 3 to 5 meters along straight horizontal sections. General Practice: Cables within the tray should be. NEC Article 392 outlines the key rules for installing and maintaining industrial cable tray systems. Here's what you need to know: Cable Types: Only use. All rights, including translation into other languages, reserved under the Universal Copyright Convention, the Berne Convention for the Protection of Literary and Artistic Works, and the International and Pan American copyright conventions. It instructs us on how to construct them, where to locate them, and how to stuff them with wires without using too much. 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.