Cable tray thickness in GB

Cable tray thickness in China is specified according to GB/T 7251. 1-2013, with typical thicknesses ranging from 1. 0 mm for light-duty trays to 2.

5 mm for extra-heavy-duty trays.

Overview of GB Standards for Cable Trays

In China, cable trays are regulated under GB/T 7251. 1-2013, which aligns with IEC 61537 for cable tray systems. The standard defines material thickness, load capacity, and duty classifications for different types of trays, including ladder, perforated, and solid-bottom trays.

Typical Thickness by Duty ClassificationLight Duty (LD): 1. 0–1. 2 mm steel or aluminum, suitable for small control and instrumentation cables.

Medium Duty (MD): 1. 2–1. 5 mm, used for moderate cable loads in commercial or industrial installations.

Heavy Duty (HD): 1. 5–2. 0 mm, designed for large power cables and longer spans.

Extra Heavy Duty (XHD): 2. 0–2. 5 mm, for extremely heavy cable loads or outdoor installations with high mechanical stress.

These thicknesses apply to galvanized steel, stainless steel, or aluminum trays, with galvanization thickness also specified separately to ensure corrosion resistance.

Material Considerations

Galvanized Steel: Hot-dip or electro-galvanized; thickness affects both mechanical strength and corrosion resistance. Stainless Steel: Typically 1. 2–2.

0 mm depending on duty; used in corrosive environments. Aluminum: 1. 2–2.

0 mm; lightweight and corrosion-resistant, suitable for indoor and outdoor use.

Additional Notes

The side rail height and rung spacing also influence load capacity and may affect the required material thickness. For installations exposed to high mechanical stress, vibration, or outdoor conditions, it is recommended to select a higher duty classification and correspondingly thicker material. Compliance with GB/T 7251.

1 ensures that trays meet mechanical, electrical, and safety requirements for industrial and commercial installations. In practice, engineers select cable tray thickness based on load calculations, span length, environmental conditions, and duty classification, ensuring both structural integrity and compliance with GB standards.