What is the spacing between 800 cable tray supports
For an 800 mm wide cable tray, support spacing typically ranges from 1.5 to 3 meters depending on load, cable type, and tray design, with rung spacing of 6–12 inches recommended for proper cable support.
Support Span
The support span is the distance between structural supports for the cable tray. For wide trays such as 800 mm, the span should generally be shorter than for narrower trays to maintain structural integrity. Typical support intervals are:
- 1.5 to 2 meters for heavily loaded trays or large power cables
- 2 to 3 meters for lighter loads or small-diameter control and instrumentation cables Longer spans may require stronger rungs or additional reinforcement to prevent sagging and maintain safety .
Rung Spacing
Rung spacing is critical to prevent cable drooping and ensure proper load distribution:
- 6–9 inches (150–230 mm) for small-diameter control and instrumentation cables
- 9–12 inches (230–300 mm) for larger power cables Wider rung spacing reduces tray strength, so for an 800 mm tray, closer rung spacing is recommended to support the wider cable load .
Vertical and Horizontal Clearance
- Maintain at least 0.3 meters clearance from ceilings or other obstructions
- Ensure 2.2 meters minimum height above ground for accessibility
- For multiple trays, allow sufficient spacing for airflow, maintenance, and heat dissipation
Cable Management and Fill
- Keep tray fill below 50% to allow proper ventilation and prevent overheating
- Use cable ties at intervals not exceeding 1.5 meters to maintain order and prevent sagging
Additional Considerations
- Follow NEC and NEMA VE-1/VE-2 standards for support spacing and installation
- For outdoor or long-span installations, consider extra supports or splice plates to maintain structural integrity
- Adjust spacing based on environmental conditions, such as temperature, vibration, or corrosive atmospheres By adhering to these guidelines, an 800 mm cable tray can be installed safely, maintain proper cable support, and comply with electrical codes while allowing for future expansion and maintenance.
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