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. 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. The spacing stated for horizontal runs may be applied also to runs at an angle of more than 30 Degrees from the vertical. For runs at an angle of 30 Degrees or less from the vertical, the vertical spacing is applicable. Note: At the point of change from vertical to horizontal and horizontal to. This publication is intended as a practical guide for the proper and safe* installation of cable ladder systems, cable tray systems, channel support systems and associated supports. Cable ladder systems and cable tray systems shall be manufactured in accordance with BS EN 61537, channel support. The horizontal spacing between power and signal cable trays is equally important, especially where they might cross electrical facilities. This spacing should generally be no less than 0. Here's what you need to know: Cable Types: Only use.