Are trough-type cable trays made of steel

Trough-type steel cable trays are robust, ventilated or solid-bottom systems designed for secure cable management, typically manufactured from galvanized steel with standardized dimensions, covers, and accessories. Material and ConstructionTrough-type steel cable trays are generally made from galvanized steel (G90 or equivalent) to provide corrosion resistance and long-term durability. The trays are fabricated from a single formed sheet with internal flanges (typically 7/8”W x 1/2”H) to enhance structural integrity.

All edges are rounded and eased to prevent damage to cable insulation during installation. Steel trays are preferred over plastic for their rigidity, reduced deflection, and fewer support requirements over long runs.

Dimensions and Sections

Standard trough tray sections are typically 120 inches (10 feet) in length, with widths and heights specified according to project requirements. Each section includes four holes per end for connection with splice connectors or other accessories. Ventilated designs are common to reduce heat buildup and prevent moisture accumulation, while solid covers are available for additional protection.

Covers and Accessories

Covers can be solid or louvered and are field-installed using self-tapping screws. Tool-less or bolted options allow easy access for maintenance and future cable additions. Accessories include bends, tees, elbows, drop-outs, size reductions, and cabinet connections, all designed to fit seamlessly with the main tray system.

Splice Connectors and Mounting

Sections are joined using U-shaped splice connectors secured with eight 3/8” hex bolts and flange nuts, allowing for thermal expansion. Steel trough trays are supported on maximum 10-foot centers using threaded rods attached to a trapeze system, ensuring stability and proper load distribution. Compliance and StandardsTrough-type steel cable trays are manufactured and tested in accordance with UL, CSA, ETL, and NEMA standards.

They comply with ANSI/NFPA 70 (National Electrical Code) and ASTM specifications for steel sheet and zinc coatings, ensuring safety, mechanical strength, and corrosion resistance. Optional powder-coated finishes can be applied for additional protection and aesthetic requirements.

Advantages

Durable and long-lasting compared to plastic alternatives Reduced number of supports required for long runs, lowering installation costs Protection from EMI for sensitive copper or fiber optic cables Precision fit for easy assembly and maintenance Trough-type steel cable trays provide a versatile, secure, and standardized solution for managing electrical and data cables in industrial, commercial, and data center environments.