Straight-through cable tray specifications and dimensions

Straight-through cable trays come in standardized widths, depths, and lengths depending on duty type, ranging from 50mm to 900mm in width and typically 3m in length.

Standard Widths and Depths

Cable trays are manufactured in light, medium, and heavy duty categories, each with specific width and depth ranges:

• Light Duty Trays: Widths of 50, 75, 100, 150, 225, and 300 mm. Depths are typically 25 mm. These are suitable for small control or instrumentation cables .
• Medium Duty Trays: Widths of 50, 75, 100, 150, 225, 300, 450, and 600 mm. Depths are around 25 mm, providing better support and ventilation for moderate cable loads .
• Heavy Duty Trays: Widths of 75, 100, 150, 225, 300, 450, 600, 750, and 900 mm. Depths can reach 50 mm, designed for large power cables or high-density installations .

Standard Lengths

Straight-through cable trays are typically manufactured in 3-meter sections, though some manufacturers offer lengths up to 12 meters or more for specific applications. Standard NEMA lengths for industrial trays are 12, 20, 24, and 30 feet, with some options extending to 40 feet for long-span outdoor installations . The choice of length depends on support spacing, load requirements, and installation environment.

Material and Finish Options

Cable trays are available in mild steel (pre-galvanized or hot-dip galvanized) and stainless steel (grade 316L). The material thickness affects load capacity and long-term durability, with heavier trays providing higher structural strength . Ventilated or slotted side walls improve airflow and heat dissipation, which is critical for high-density cable runs.

Key Considerations

• Width determines cable capacity and airflow; increasing width is often more effective than increasing depth for heat dissipation .
• Depth (side rail height) affects vertical stacking and NEC fill compliance.
• Rung spacing in ladder trays typically ranges from 6 to 18 inches, with closer spacing recommended for small-diameter control cables and wider spacing for large power cables .
• Cable fill should not exceed the recommended percentage of usable tray area to prevent overcrowding and overheating . By selecting the correct width, depth, and length based on cable type, load, and installation environment, straight-through cable trays can provide safe, code-compliant, and future-ready cable management solutions.