Standards for cable tray support installation on construction sites

Cable tray supports must be installed according to recognized standards such as IEC 61537, BS EN 61537, and NEMA VE 1 to ensure safety, mechanical integrity, and compliance with electrical codes.

Key Standards and Guidelines

IEC 61537 is the international benchmark for metal cable tray systems, covering steel, stainless steel, and aluminum trays. It specifies construction requirements, load testing, and performance parameters to ensure trays can safely support cables under mechanical and environmental stresses . BS EN 61537 aligns with IEC 61537 and is widely used in the UK and Europe. It defines cable support systems, including ladders, trays, and mesh trays, and emphasizes proper material selection, corrosion protection, and system compatibility . NEMA VE 1 and CSA C22.2 provide North American standards for metal cable trays, including load/span designations, construction, and installation requirements. These standards also cover nonmetallic trays and fittings in accordance with the NEC and CEC .

Installation Best Practices

1. Support Spacing and Load Capacity
   • Supports must be spaced according to tray type, cable weight, and load class.
   • Load testing should confirm the tray can withstand cable weight, environmental factors, and short-circuit forces .
2. Material and Corrosion Protection
   • Steel, stainless steel, or aluminum trays are common.
   • Galvanization or other protective coatings are recommended for industrial or outdoor environments .
3. Mounting and Fastening
   • Trays can be mounted on ceilings, walls, or floors using approved brackets, hangers, or channel supports.
   • Only components designed and tested together should be used to ensure system integrity .
4. Routing and Fittings
   • Use bends, T-pieces, crossovers, and reducers to manage horizontal and vertical changes in cable routing.
   • Ensure proper separation of power and communication cables where required .
5. Safety Considerations
   • Cable trays are not designed to support personnel; walking on trays can cause injury or system damage.
   • Bundling and balancing cables within trays prevents uneven loading and potential failure .
6. Compliance and Certification
   • CE marking, UL, or other third-party certifications indicate compliance with relevant standards.
   • Periodic inspection and maintenance are recommended to ensure long-term safety and performance .

Summary

Proper cable tray support installation requires adherence to international and regional standards, careful selection of materials, correct support spacing, and safe routing practices. Following IEC 61537, BS EN 61537, and NEMA VE 1 ensures that cable trays can safely support electrical and communication cables while minimizing risks of mechanical failure, electrical hazards, and non-compliance on construction sites .