Standard for Hot-Dip Galvanized Trapezoidal Cable Trays

Hot-dip galvanized trapezoidal cable trays are typically manufactured according to EN ISO 1461 or GB/T 13912-2020, ensuring a durable zinc coating for corrosion protection. Applicable StandardsEN ISO 1461 defines the hot-dip galvanizing process for steel products, including cable trays, as immersing cleaned steel in molten zinc at approximately 450°C to form a metallurgically bonded zinc and zinc-iron alloy coating. This standard specifies minimum average zinc coating thicknesses based on steel thickness, for example: Steel 1.

5–3 mm → ~45 µmSteel 3–6 mm → ~55 µmSteel >6 mm → ~70 µm GB/T 13912-2020 is the Chinese standard for hot-dip galvanized coatings on fabricated iron and steel articles, providing specifications and test methods for thick, adherent zinc layers suitable for harsh environments such as outdoor, industrial, or coastal applications. Coating RequirementsHot-dip galvanized trays are preferred over electro-galvanized trays due to superior corrosion resistance, adhesion, and durability. For standard hot-dip galvanized trays, a zinc coating mass of no less than 275 g/m² (approximately 39 µm thickness) is recommended to ensure long-term protection, especially in marine or coastal environments.

This coating level provides a uniform, dense layer that resists white rust during storage and transport.

Design and Environmental Considerations

Trapezoidal cable trays with hot-dip galvanizing are suitable for industrial, infrastructure, and energy projects where long service life and minimal maintenance are required. The coating is integral to the steel, resistant to impact and abrasion, and can withstand aggressive environments. Perforated designs improve ventilation and reduce cable heating, while non-perforated trays offer smooth surfaces for industrial or architectural applications.

Summary

Standards: EN ISO 1461 (Europe), GB/T 13912-2020 (China)Minimum Zinc Coating: 275 g/m² (~39 µm) for standard traysMaterial: Cold-formed carbon steelApplications: Harsh environments, outdoor, industrial, coastal areasAdvantages: High corrosion resistance, long service life, impact and abrasion resistance, suitable for perforated or non-perforated designs Using hot-dip galvanized steel according to these standards ensures that trapezoidal cable trays meet international quality and durability requirements for demanding projects.