Typical galvanized cable tray wall thickness ranges from 1.5 mm to 3 mm, with zinc coating thickness of at least 45 µm for standard trays.

Steel Sheet Thickness

The side plates and base plates of galvanized cable trays are generally manufactured with a thickness between 1.5 mm and 3 mm. This range ensures sufficient structural strength for supporting cables while maintaining manageable weight for installation. Heavier components, such as brackets and supports that are often thicker than 3 mm, require higher standards for corrosion protection and mechanical strength .

Zinc Coating Thickness

For corrosion resistance, galvanized trays are coated with zinc. The minimum local zinc thickness for standard tray sheets is 45 µm, which corresponds to a coating mass of at least 325 g/m². For thicker or heavier components, the zinc coating should be ≥55 µm to provide enhanced protection . The coating must be continuous, uniform, and free from defects such as bare spots, blisters, or rough nodules. Electro-galvanized trays follow standards such as GB/T 26941.1-2011 .

Galvanization Methods

• Electro-galvanization: Produces a thinner, smoother zinc layer, typically used for lighter trays.
• Hot-dip galvanization: Involves immersing the tray in molten zinc, creating a thicker, more durable coating that covers all surfaces, including edges and joints .

Practical Considerations

When selecting a galvanized cable tray, consider:

• Tray type and load requirements: Ladder trays may require thicker side rails for long spans.
• Environmental conditions: Outdoor or corrosive environments may necessitate hot-dip galvanization and thicker coatings.
• Compliance with standards: Ensure the tray meets NEMA, IEC, or local regulations for both mechanical strength and corrosion protection .

By adhering to these thickness and coating specifications, galvanized cable trays provide reliable structural support and long-term corrosion resistance for electrical installations.