For vertical cable tray runs, supports should generally be fixed to the building structure at intervals of less than 2 meters, with cables secured at the top and every 1.5 meters.

Recommended Support Spacing

For vertical cable tray installations, the following guidelines are commonly recommended:

• Support Interval: Vertical cable trays should be attached to walls, columns, or other structural elements at intervals preferably less than 2 meters to ensure stability and prevent sagging or excessive stress on the tray and cables (Apex Tray) .
• Cable Securing: Cables within the tray should be secured at the top and at intervals of approximately 1.5 meters along the vertical run to maintain organization and prevent movement (Apex Tray) .
• Manufacturer Guidance: Always consult the cable tray and support manufacturer for specific recommendations, especially for armored, shielded, or coaxial cables, as mechanical properties may vary (Eng-Tips) .

Structural Considerations

• Tray Material and Depth: For steel trays (e.g., 6-inch deep, 14-gauge hot-dip galvanized), a vertical section up to 20 feet may be self-supporting, but horizontal forces require fastening to walls or columns (Eng-Tips) .
• Load Calculations: In complex risers, consider static and dynamic loads, including cable weight, thermal expansion, and seismic forces. A mechanical calculation may be necessary to ensure safety and compliance (Eng-Tips) .
• Support Types: Wall brackets, suspended supports, and center suspensions are commonly used to secure vertical trays (OBO CMS) .

Additional Best Practices

• Cable Organization: Lay cables straight and orderly, avoiding overlaps or protrusions. Secure all bends and turns to prevent stress on the cables (Apex Tray) .
• Fire Safety: Use fire-resistant supports for all cable types to prevent premature failure in case of fire (Prysmian) .
• Clearances: Maintain adequate clearance from ceilings and other obstructions, typically at least 0.3 meters from the top of the tray, and ensure trays are installed at a safe height above the floor (Apex Tray) . By following these guidelines, vertical cable tray installations can achieve structural stability, cable safety, and compliance with industry standards such as BS EN 61537, NEMA VE 2-2001, and IEEE Std 525-1992.