How far apart are the cable tray support points
Cable tray support points are typically spaced between 1.5 meters and 3.6 meters apart, depending on tray type, load, and installation method.
General Guidelines
The spacing of cable tray supports depends on the type of tray, the weight of the cables, and the installation environment. For ladder trays, the maximum support spacing is generally up to 3.6 meters for standard loads, with each hanger capable of supporting approximately 318–340 kg (700–750 lbs) per support point . For straight tray runs, supports are often placed 1/4 of the tray length from each end when using two support points; for a 6-meter tray, this would be about 1.5 meters from each end .
Factors Affecting Support Spacing
- Tray Type: Ladder trays, ventilated troughs, and solid-bottom trays have different load-bearing characteristics. Ladder trays allow for wider spacing due to their structural design, while solid-bottom trays may require closer supports to prevent sagging .
- Cable Load: Heavier cable bundles reduce the allowable span between supports. The total anticipated weight of the cables must be considered when determining support intervals .
- Environmental Conditions: Exposure to vibration, temperature extremes, or corrosive environments may necessitate closer support spacing to maintain structural integrity .
- Code Compliance: Electrical codes such as BS 7671 and NEC 392.22 require that cables are supported to prevent undue mechanical strain and ensure safety, particularly in fire conditions .
Practical Installation Tips
- Use trapeze or swing supports for ceiling installations and cantilever wall brackets for vertical runs .
- Ensure supports are aligned with tray connectors to avoid simple beam configurations that could compromise strength .
- Always consult the manufacturer's load capacity charts and follow local electrical codes for final support spacing decisions . By following these guidelines, cable trays can be installed safely, minimizing sag and mechanical stress while ensuring compliance with electrical standards.
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