Steel cable trays are commonly made from pre-galvanized, hot-dip galvanized, or stainless steel, offering durability, corrosion resistance, and suitability for indoor and outdoor applications.

Types of Steel Used

Steel cable trays are typically manufactured from strip steel, which is formed into trays with various heights, widths, and configurations. The main types include:

• Pre-galvanized steel: Steel coated with zinc before fabrication, providing basic corrosion resistance suitable for indoor or mildly corrosive environments .
• Hot-dip galvanized steel: Steel dipped in molten zinc after fabrication, offering superior corrosion protection, especially for outdoor or industrial environments .
• Stainless steel (AISI 316L or similar): Contains chromium and molybdenum, providing excellent resistance to corrosion, including in marine or highly corrosive environments .

Finishes and Protection

The choice of finish affects the tray's longevity and maintenance requirements:

• Electro-galvanized: Thin zinc coating, suitable for light-duty applications.
• Hot-dip galvanized: Thicker zinc layer, sacrificially protects steel even if scratched, ideal for heavy-duty or outdoor use .
• Stainless steel: Naturally forms a protective oxide layer, highly resistant to pitting and stress corrosion .

Design Considerations

Steel cable trays are designed with features such as:

• Side return flanges for increased load capacity and cable protection .
• Slot patterns for easy cable tie placement and ventilation.
• Variety of heights and widths to accommodate different cable loads, typically ranging from 50 mm to 600 mm in width and 50 mm to 100 mm in height, with custom sizes available .
• Double return flanges to prevent cable damage and improve structural integrity .

Standards and Compliance

Steel cable trays are manufactured to comply with international standards such as BS EN 61537:2023, NEMA, and cabling standards like CENELEC EN 50173-1 and ISO/IEC 11801-1:2017, ensuring safety, reliability, and compatibility with electrical installations .

Applications

• Industrial and commercial buildings: For heavy-duty cable routing.
• Outdoor and marine environments: Hot-dip galvanized or stainless steel trays resist corrosion.
• Future-proofing: Steel trays can accommodate increased cable loads, typically designed with a 25% margin for future expansion . Choosing the correct strip steel material and finish ensures long-term durability, corrosion resistance, and safe cable management in the intended environment.