Continuous bending of cable trays

Continuous bending of cable trays can be achieved safely using flexible tray systems or by adhering to minimum bend radius guidelines to protect cables and maintain structural integrity.

Methods for Continuous Bending

Flexible cable tray systems, such as the Cablobend EZ, allow installers to create vertical and horizontal bends up to 90° without cutting the tray. These systems use adjustable mesh trays and easy-to-bend wires, significantly reducing installation time and improving safety by eliminating the need for cutting tools at height . They are available in multiple widths and heights, and rigidity clips can be used to secure sections together for added strength . For traditional rigid trays, continuous bending is limited by the material properties. Bends must respect the minimum bend radius to prevent damage to the tray and the cables it supports. The minimum bend radius depends on the cable type, tray material, and load, and is typically specified in technical guides and standards .

Standards and Guidelines

The IEC 61537 standard provides international guidance for cable tray systems, including mechanical strength, corrosion resistance, and electrical continuity . Following these standards ensures that bent trays can safely support cable loads and maintain grounding paths. Technical guides recommend maintaining proper spacing and using appropriate bend radii to avoid overheating, mechanical stress, or cable deformation .

Practical Considerations

• Rung spacing: For wire mesh trays, a spacing of 150–230 mm (6–9 inches) is recommended to support cables during bends .
• Cable protection: Use covers or additional supports for bends with high cable density or sensitive instrumentation cables .
• Material selection: Aluminum, stainless steel, or coated steel trays offer different flexibility and corrosion resistance, affecting how sharply they can be bent .
• Installation efficiency: Prefabricated bend systems reduce labor and improve safety, especially in large-scale installations with multiple bends . By combining flexible tray systems with adherence to minimum bend radii and IEC standards, continuous bending can be performed efficiently while ensuring cable safety, structural integrity, and compliance with international regulations.