Thickness requirements for galvanized cable tray covers

Galvanized cable tray covers typically have a steel thickness of 1.5–3 mm, with a zinc coating of 45–55 µm depending on the component size and galvanization method.

Steel Thickness

The base and side plates of cable tray covers are generally made from steel sheets ranging from 1.5 mm to 3 mm in thickness. Heavier components, such as brackets or supports, may exceed 3 mm to provide additional structural strength and load-bearing capacity . The choice of steel thickness depends on the application, environmental conditions, and mechanical load requirements.

Zinc Coating Thickness

The zinc coating provides corrosion protection and is applied either by electro-galvanization or hot-dip galvanization. Typical requirements are:

• Local thickness: Minimum 45 µm for standard tray sheets, increasing to ≥55 µm for heavier components .
• Mean coating mass: At least 325 g/m² for standard sheets, corresponding to the minimum zinc thickness .
• Electro-galvanized steel: Commonly uses Sendzimir Z275 steel, which corresponds to a zinc coating of 18–20 µm per side . The zinc coating forms a protective layer that acts as a sacrificial anode, preventing corrosion even if the steel surface is scratched or damaged. Over time, the zinc reacts with air and moisture to form a stable patina, enhancing long-term durability .

Standards and Compliance

Cable tray covers are manufactured according to standards such as NEN-EN-ISO 1461 for hot-dip galvanization and GB/T 26941.1-2011 for electro-galvanized trays . These standards ensure uniform coating, continuous coverage, and resistance to environmental corrosion. Visual inspection allows minor variations in color or surface finish, but defects like bare spots, blisters, or excessive zinc dross are not permitted .

Summary

• Steel thickness: 1.5–3 mm (heavier components >3 mm)
• Zinc coating thickness: 45–55 µm (electro-galvanized Z275: 18–20 µm per side)
• Standards: NEN-EN-ISO 1461, GB/T 26941.1-2011
• Purpose: Structural integrity, corrosion protection, and long-term durability in industrial and outdoor environments . This combination of steel and zinc thickness ensures that galvanized cable tray covers are robust, corrosion-resistant, and suitable for a wide range of electrical installations.