Small cable trays typically have widths ranging from 50mm to 150mm and depths from 25mm to 150mm, suitable for low-volume cable installations.

Standard Widths

Small cable trays are generally designed for a limited number of cables, such as control or instrumentation wiring. Nominal inside widths for these trays usually range from 50mm to 150mm, with narrow trays (100–150mm) commonly used in process industries or small commercial installations where cable counts are modest and space is limited . The outside width will be slightly larger due to side rail thickness, which should be considered when planning wall or floor penetrations .

Standard Depths

The depth (or side rail height) of small trays typically ranges from 25mm to 150mm, depending on the number of cables and ventilation requirements . Depth affects vertical stacking capacity and heat dissipation, but increasing width often provides better airflow and easier cable pulling than simply increasing depth .

Standard Lengths

Cable trays are usually manufactured in 3-meter (10-foot) straight sections, which simplifies transport and installation . This length is practical for handling by two people while covering long distances efficiently.

Material Thickness

Material thickness varies by load requirements and material type. For small trays, galvanized steel thickness typically meets ASTM A653 standards, ensuring adequate corrosion resistance and structural support . Thickness affects load capacity and allowable span, so even small trays must meet minimum standards to prevent deflection or failure .

Cable Fill and Safety

Small trays should not be fully filled; a 40% fill ratio is recommended to allow proper ventilation, prevent overheating, and accommodate future cable additions . This ensures safe operation and compliance with NEC and IEC standards.

Summary

• Width: 50–150mm (inside usable width)
• Depth: 25–150mm
• Length: 3 meters per section
• Material Thickness: per ASTM A653 or equivalent
• Recommended Fill: 40% for small cable installations These dimensions provide a practical and code-compliant solution for small-scale cable management, ensuring safety, ventilation, and future expandability .