Requirements for cable tray support screws

Cable tray installation screws must comply with IEC 61537 standards, be corrosion-resistant, and match the tray system's load and material specifications.

Standards and Compliance

Screws used for cable tray installation should meet the IEC 61537:2006 standard for cable management systems, ensuring they are suitable for supporting and routing cables in low-voltage applications . For installations in the UK or Europe, compliance with BS EN 61537 is recommended . Using screws that meet these standards ensures structural integrity, safety, and compatibility with the cable tray system.

Material and Corrosion Resistance

The screws must be made of corrosion-resistant materials, such as stainless steel or galvanized steel, to withstand indoor and outdoor environments . The choice of material should match the cable tray's material (e.g., steel, aluminum) to prevent galvanic corrosion and maintain mechanical strength over time.

Size and Load Considerations

Screws should be selected based on the load capacity of the cable tray and the expected cable weight . The diameter and length must be sufficient to securely fasten the tray to supports or walls without compromising the tray's structural integrity. Connector holes in the tray are designed for specific screw sizes, and using the correct size ensures proper load distribution and prevents loosening under vibration or thermal expansion.

Installation Guidelines

• Only qualified personnel should perform installation to avoid injury and ensure compliance with electrical safety standards .
• Wear protective gloves to prevent cuts from tray edges.
• Screws should be tightened to the manufacturer's recommended torque to avoid over-stressing the tray or under-tightening, which could lead to tray movement .
• For outdoor or harsh environments, consider screws with additional coatings or finishes to enhance durability .

Environmental and Temperature Considerations

Cable tray screws must withstand the ambient temperature range of the installation site, typically from ‒20 °C to 120 °C . Below ‒20 °C, some materials may become brittle and unsuitable for installation. Ensure that the selected screws are compatible with the environmental conditions to maintain long-term performance.

Summary

To ensure a safe and durable cable tray installation, screws must:

• Comply with IEC 61537 or BS EN 61537 standards
• Be made of corrosion-resistant materials compatible with the tray
• Match the load and connector specifications of the tray system
• Be installed by trained personnel following manufacturer torque and safety guidelines
• Be suitable for the ambient temperature and environmental conditions of the installation site . Following these requirements ensures that the cable tray system remains secure, supports the intended cable load, and maintains compliance with industry standards.