Requirements for fixing cable tray screws

Cable tray screws must be installed by trained personnel using appropriate fasteners, following IEC 61537 standards, and considering load, environment, and safety requirements.

Personnel and Safety

Only electrically trained specialists should install cable trays and fix screws, as improper handling can cause injury or system failure. Protective gloves are recommended to prevent cuts from tray edges, and care must be taken to avoid over-tightening, which can damage the tray or fittings. Standards ComplianceScrew-on cable tray systems must comply with IEC 61537: 2006 for low-voltage cable management, ensuring mechanical strength, electrical continuity, and corrosion resistance.

In the U

K, BS EN 61537 provides similar guidance for cable tray and ladder systems. Compliance ensures safe load-bearing capacity and compatibility with accessories like bends, tees, and covers.

Screw Selection and Installation

Use appropriate fastening material for the connector holes provided in the tray system. Screws should match the tray material (e.g., steel, stainless steel, or aluminum) and corrosion protection requirements, especially for outdoor or humid environments. Ensure tightening torque is sufficient to secure the tray without deforming it; follow manufacturer specifications.

Maintain proper alignment and spacing of screws to distribute load evenly and prevent tray sagging.

Load and Environmental Considerations

Design the tray system according to expected cable load, including weight of cables, equipment, and environmental factors like wind or ice. Screw-on trays are suitable for ambient temperatures from ‒20 °C to 120 °C; below ‒20 °C, materials may become brittle. For outdoor or corrosive environments, select screws and trays with appropriate corrosion protection.

Accessories and System Integration

Use connectors, fittings, and covers designed for the specific tray system to ensure structural integrity. Avoid using trays as walkways or supports for personnel, as this can compromise screw integrity and safety. By following these requirements, cable tray screws will provide secure, compliant, and long-lasting support for electrical cables in various installations.