Requirements for Welding and Fabrication of Cable Tray Supports

Welding of cable tray supports must comply with IEC 61537 and BS EN 61537 standards, ensuring mechanical strength, corrosion resistance, and safe load-bearing capacity.

Applicable Standards

Cable tray supports are governed by IEC 61537 for international compliance and BS EN 61537 in the UK, which define the construction, testing, and performance requirements for metallic cable tray systems and their supports. These standards ensure that welded supports can safely carry the weight of cables, imposed loads, and environmental factors such as wind, ice, or vibration.

Material and Welding Considerations

Material Selection: Supports are typically made from steel, stainless steel, or aluminum, with corrosion-resistant coatings such as galvanization or stainless steel grades like AISI 316L. Welding Quality: Welds must maintain the structural integrity of the support, avoiding cracks, porosity, or undercuts. Only qualified welders should perform welding, following recognized welding procedures.

Load Capacity: Welded supports must withstand the weight of the cable tray, cables, and any additional imposed loads, including dynamic forces during short circuits.

Installation Guidelines

Support Spacing: Supports should be spaced according to the tray type, material, and load rating, as specified in IEC 61537. Overly long spans without proper welding can compromise structural stability. Corrosion Protection: Welded areas must be treated to prevent corrosion, especially if the support is galvanized or stainless steel.

Grinding or coating may be required to restore protective layers after welding. Electrical Continuity: Welded supports should maintain electrical continuity if the tray system serves as a grounding path, ensuring safe operation. Inspection and Testing: Post-weld inspection, including visual checks and, if necessary, non-destructive testing, ensures compliance with mechanical and safety standards.

Best Practices

Use pre-fabricated components where possible to minimize on-site welding. Avoid welding in areas that may compromise fire resistance or insulation of nearby cables. Ensure that welded supports are aligned and level, and that the load is evenly distributed to prevent deformation or failure.

By adhering to these standards and practices, welded cable tray supports will provide safe, durable, and compliant support for electrical and communication cable installations.