Parallel cable tray supports are designed based on tray width, depth, material thickness, and span, with standard spacing typically ranging from 1.5 to 3 meters depending on load and tray type.

Key Considerations for Parallel Cable Tray Supports

Support spacing: The distance between supports for parallel cable trays depends on the tray type and load. Ladder trays generally allow spans of 1.5 to 3 meters, while solid-bottom or perforated trays may require closer spacing to prevent deflection and maintain structural integrity . Tray width and depth: Standard tray widths range from 100 mm to 600 mm or more, with depths (side rail height) from 50 mm to 150 mm, affecting the support design and spacing . Wider or deeper trays carrying heavier cables require shorter spans between supports. Material thickness: The thickness of the tray material (typically 1.2 mm to 3 mm for steel or aluminum) influences load capacity and allowable span. Thicker trays can span longer distances without additional support . Support types: Supports include wall brackets, suspended supports, and center suspensions. For parallel trays, supports must maintain consistent alignment and separation to prevent sagging or cable interference . Parallel tray alignment: When installing multiple trays in parallel, maintain a minimum separation of 50–100 mm between trays to allow airflow, cable pulling, and heat dissipation. Supports should be designed to hold all trays securely while allowing independent movement if needed . Mounting elements: Use mounting plates or brackets to attach supports to ceilings, walls, or steel structures. Ensure that the mounting system can handle the combined weight of all parallel trays and cables . Code compliance: Follow NEC, NEMA, and IEC standards for tray fill, support spacing, and load ratings. Overcrowding or excessive span can lead to deflection, heat buildup, and non-compliance .

Practical Example

For two parallel ladder trays, each 300 mm wide and 100 mm deep, carrying medium-voltage cables:

• Support spacing: 2 meters maximum
• Tray separation: 100 mm
• Material: 2 mm galvanized steel
• Mounting: suspended from ceiling with threaded rods and brackets This configuration ensures proper load distribution, airflow, and compliance with standard guidelines. By considering tray type, width, depth, material, and load, engineers can determine the optimal support dimensions and spacing for parallel cable tray installations, ensuring safety, durability, and ease of maintenance .