Requirements for Electrical Cable Tray Hangers
Cable tray hangers must comply with IEC 61537/BS EN 61537 standards, support the tray load safely, maintain proper spacing, and use corrosion-resistant materials suitable for the installation environment.
Standards and Compliance
Cable tray hangers should be designed and installed in accordance with IEC 61537 and BS EN 61537, which define mechanical strength, load capacity, and installation requirements for metal cable tray systems . Compliance ensures that trays can safely support the weight of cables, resist environmental factors, and maintain electrical continuity where required . Hangers must also meet fire safety requirements, particularly for fire-resistant cables, to prevent premature system failure during a fire .
Load Capacity and Mechanical Strength
Hangers must be capable of supporting the full weight of the cable tray and its contents without excessive deflection or strain on the tray or cables . The load rating should consider the type of cables, tray length, and environmental conditions. Bundled or long trays may require additional support points to prevent sagging or mechanical stress .
Spacing and Support Intervals
The spacing of hangers depends on the tray type, material, and load. Typical guidelines suggest:
- Standard cable trays: support intervals of 1.5–3 meters depending on tray width and load .
- Heavy-duty or long-span trays: closer spacing may be required to prevent deflection.
- Hangers should be installed so that cables are not subjected to undue mechanical strain, and terminations are not stressed .
Material and Corrosion Protection
Hangers should be made from steel, stainless steel, or other corrosion-resistant materials suitable for the installation environment . Galvanized or coated hangers are recommended for outdoor or humid environments. Non-metallic banding may be used for bundled trays to avoid rust stains or contamination .
Installation Considerations
- Hangers must be securely anchored to ceilings, walls, or structural supports.
- The system should allow for ventilation and cable cooling, avoiding overloading .
- Only components designed and tested together should be used to ensure system integrity .
- Fire-resistant hangers are required for cables that must maintain integrity during a fire .
Summary
Electrical cable tray hangers must:
- Comply with IEC 61537/BS EN 61537 standards.
- Support the tray and cable load safely without excessive deflection.
- Be spaced appropriately according to tray type, load, and span.
- Use corrosion-resistant materials suitable for the environment.
- Ensure proper installation to maintain mechanical and fire safety. Following these requirements ensures a safe, durable, and compliant cable tray installation.
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