How to make cable trays in a factory

Cable trays are manufactured by selecting appropriate materials, cutting and shaping metal sheets, forming the tray structure, punching holes, and finishing with welding and surface treatment for durability.

Material Selection

The first step is choosing the right material based on strength, corrosion resistance, and the intended environment. Common materials include steel for strength, stainless steel for moisture-prone areas, aluminium for lightweight applications, and fiberglass for chemical or outdoor environments. For galvanized trays, a zinc coating is applied to prevent rust and extend lifespan .

Cutting and Shaping

Raw metal sheets or coils are cut to precise dimensions using laser cutting, shearing, or CNC punching machines. Accuracy is critical to ensure smooth edges and proper tray dimensions. The metal is then shaped into strips or flat panels ready for forming .

Forming the Tray

The cut metal is bent into the desired tray shape, typically C, U, ladder, or perforated designs, using hydraulic presses, roll forming machines, or press brakes. Roll forming machines automate the process by feeding metal through progressive dies to bend, punch, and cut the tray sections to length . Proper fold angles are essential to ensure that connectors and elbows fit correctly during installation.

Punching and Ventilation

For ventilated or perforated trays, holes are punched using CNC punchers. Standard hole sizes, such as 7x25mm, allow airflow to prevent cable overheating. Maintaining symmetrical patterns is important for both aesthetics and structural integrity .

Welding and Assembly

Tray components are welded or joined to reinforce strength, especially for heavy-duty applications. Welding ensures the tray can support the intended cable load without deformation. Skilled operators must account for material properties and bend allowances to maintain structural integrity .

Surface Treatment and Finishing

After forming and welding, trays may undergo surface treatments such as degreasing, cleaning, and coating to enhance corrosion resistance and durability. For galvanized trays, zinc coating is applied, while powder coating or painting may be used for aesthetic or environmental protection .

Quality Control

Each tray should be inspected for dimensional accuracy, weld quality, and load-bearing capacity. Rigorous testing ensures compliance with industry standards and prevents future failures in industrial or commercial installations .

Automation and Machinery

Modern factories often use automatic cable tray roll forming machines with CNC controls, servo-electric pullers, and rotary shears to increase precision and production efficiency. These machines allow quick switching between tray types and sizes, improving flexibility and reducing labor costs . By following these steps—material selection, precise cutting, forming, punching, welding, surface treatment, and quality control—a factory can produce durable, high-quality cable trays suitable for industrial, commercial, or outdoor electrical installations.