Cable tray installation material requirements

Cable trays must be made from materials suitable for the environment, load, and safety requirements, commonly including steel, aluminum, stainless steel, or FRP.

Material Selection

Metallic Materials: Steel: Galvanized or painted steel is widely used for general industrial and commercial applications due to its strength and durability. Stainless Steel: Recommended for corrosive or outdoor environments, such as chemical plants or coastal areas, because of its high corrosion resistance. Aluminum: Lightweight and corrosion-resistant, aluminum is suitable for indoor and outdoor installations where moderate mechanical strength is sufficient.

Non-

Metallic Materials: FRP (Fiber-Reinforced Plastic): Used in highly corrosive environments or where electrical insulation is required.

FR

P trays are resistant to chemicals, moisture, and UV exposure.

Environmental Considerations

Indoor vs. Outdoor: Aluminum and FRP are preferred outdoors due to corrosion resistance, while galvanized steel is suitable for indoor dry environments. Hazardous Locations: Stainless steel or FRP may be required in areas with chemical exposure or explosive atmospheres, following IEC 60079 and IEEE standards.

Temperature and U

V Exposure: Materials must withstand ambient temperature ranges and sunlight exposure; UV-resistant coatings or FRP are recommended for outdoor trays.

Load and Mechanical Requirements

Materials must support the weight of cables without excessive sagging. Tray selection should consider the span between supports, cable weight, and potential future expansion. Rung spacing for ladder-type trays is typically 150–230 mm (6–9 inches) to maintain cable support and prevent bending.

Compliance and Safety

Metallic trays can serve as grounding conductors if they meet NEC requirements. Materials must comply with relevant standards such as BS EN 61537, NEC Article 392, and project-specific specifications. Nonmetallic trays have additional limitations, including reduced mechanical strength and restrictions in certain hazardous or high-temperature areas.

Summary

When selecting cable tray materials, consider: Environmental conditions (corrosive, outdoor, hazardous). Mechanical load and support spacing. Electrical safety and grounding requirements.

Compliance with local codes and international standards. Proper material selection ensures long-term durability, safety, and compliance for cable tray installations in industrial, commercial, and specialized environments.