For vertical cable tray runs, supports should generally be installed at the top and at intervals of approximately 1.5 meters (5 feet) to ensure stability and prevent sagging.

Recommended Support Spacing

For trapezoidal cable trays in vertical shafts, the following guidelines apply:

• Top and Intermediate Supports: Vertical runs should be secured at the top and then at regular intervals of 1.5 meters (approximately 5 feet) to maintain stability and prevent undue stress on the tray and cables .
• Support Elements: Use wall brackets, suspended supports, or center suspensions designed to carry the tray's weight and any additional loads such as wind, seismic forces, or maintenance activities .
• Material Considerations: Steel or stainless steel trays may allow slightly longer spans, while lighter materials may require closer support spacing .
• Load Distribution: Ensure that the supports are capable of handling the combined weight of the cables and the tray itself. Uneven or insufficient support can lead to sagging, cable damage, or structural failure .

Installation Best Practices

• Alignment: Keep the tray vertical and straight, avoiding twists or bends between supports .
• Binding Cables: Secure cables within the tray at intervals not exceeding 1.5 meters to prevent movement and maintain order .
• Seismic and Environmental Considerations: In earthquake-prone or high-wind areas, reduce support spacing and use reinforced brackets to prevent tray displacement .
• Compliance: Follow NEC Article 392, IEC 61537, or local standards for vertical tray installations to ensure safety and regulatory compliance .

Summary

For vertical trapezoidal cable tray installations:

• Secure at the top and every 1.5 meters along the shaft.
• Use appropriate support elements rated for the tray and cable load.
• Maintain straight alignment and proper cable binding.
• Adjust spacing for environmental, seismic, or material-specific requirements. Following these guidelines ensures structural integrity, cable safety, and compliance with electrical installation standards .