Construction Scheme for Trapezoidal Cable Trays

Trapezoidal cable trays are constructed from steel, stainless steel, or aluminum, with a trapezoidal side profile for enhanced strength and load-bearing capacity, and are typically hot-dip galvanized or otherwise treated for corrosion resistance.

Materials and Surface Finishes

Trapezoidal cable trays are commonly made from high-quality steel plates, stainless steel (304/316), or aluminum, depending on the environmental conditions and mechanical requirements . Steel trays are often hot-dip galvanized to provide a thick, durable zinc layer that protects against corrosion, while stainless steel offers inherent corrosion resistance, particularly in harsh or chemical environments . Aluminum trays are lightweight and resistant to atmospheric corrosion due to a natural oxide layer, making them suitable for outdoor or humid environments .

Dimensions and Design

The trapezoidal shape features side rails with heights typically ranging from 50 mm to 200 mm, and tray widths from 100 mm to 1000 mm, with lengths commonly 2000 mm, 2400 mm, 3000 mm, or 6000 mm, though custom sizes are available . The trapezoidal profile increases the tray's structural rigidity, allowing it to support heavier cable loads over longer spans compared to flat-bottomed trays . Tray thickness usually ranges from 0.9 mm to 3.0 mm, depending on load requirements.

Load Capacity

Trapezoidal cable trays are designed to handle working loads between 100 kg and 250 kg, depending on material, thickness, and span . Proper load calculations are essential to prevent sagging or structural failure, and the tray must be supported at intervals recommended by the manufacturer or according to standards.

Installation and Support

Installation involves mounting the trays on ceilings, walls, or floors using support elements such as wall brackets, suspended supports, or center suspensions . Horizontal and vertical bends, T-pieces, crossovers, and end closures allow flexible routing of cables. Supports must be spaced according to the tray's material, width, and load to ensure stability and prevent deformation . Proper bonding and grounding are critical to maintain electrical safety.

Standards and Compliance

Trapezoidal cable trays should comply with IEC 61537, which specifies construction, testing, and performance requirements for metallic cable tray systems . Compliance ensures mechanical strength, electrical safety, and long-term durability, and is often required for legal supply in international projects.

Summary

Trapezoidal cable trays combine strength, corrosion resistance, and flexibility for industrial and commercial cable management. Selection of material, surface finish, dimensions, and support spacing must consider load requirements, environmental conditions, and applicable standards to ensure safe and durable installations .