Angle iron reinforcement for cable trays

Cable trays can be reinforced using angle iron to increase structural rigidity and support heavier cable loads, ensuring compliance with mechanical and safety standards.

Purpose of Reinforcement

Reinforcing cable trays with angle iron is primarily done to prevent sagging, maintain proper alignment, and support heavier or densely packed cables. This is especially important in industrial or commercial installations where cable trays may span long distances or carry high-weight power and control cables .

Materials and Selection

• Angle iron is typically made of steel or stainless steel, often galvanized to resist corrosion .
• The size and thickness of the angle iron should be selected based on the span length, tray width, and expected cable load. Common sizes range from 40x40 mm to 75x75 mm with thicknesses of 3–6 mm for medium-duty reinforcement .

Installation Methods

1. Undertray Support: Angle iron can be mounted beneath the cable tray along its length, acting as a stiffening member to reduce deflection.
2. Side Bracing: Attaching angle iron along the sides of the tray can increase lateral rigidity and prevent twisting.
3. Cross Bracing: For long spans, cross members of angle iron can be installed between parallel trays to distribute load evenly .
4. Fastening: Use high-tensile bolts, washers, and nuts to secure the angle iron to the tray and support structure. Ensure that the fasteners are compatible with the tray material and environmental conditions .

Spacing and Support Considerations

• Support intervals should follow manufacturer recommendations or standards such as DIN EN 61537, typically ranging from 1.5 to 3 meters depending on tray type and load .
• Additional threaded rod suspensions or ceiling brackets can be used in combination with angle iron to further reduce deflection over long spans .
• Ensure that reinforcement does not interfere with cable bending radii or access for maintenance .

Compliance and Safety

• Reinforced trays must comply with mechanical load limits, fire safety, and electrical standards.
• Angle iron reinforcement should not compromise circuit integrity or cable separation requirements .

Practical Tips

• Pre-plan reinforcement locations based on cable weight distribution.
• Use U-profiles or couplers to connect multiple trays and maintain alignment.
• Inspect reinforced trays periodically for corrosion, loose fasteners, or deformation. By following these guidelines, angle iron reinforcement can significantly improve the structural performance and longevity of cable tray installations, ensuring safe and reliable cable management in demanding environments .