Galvanized cable tray wall thickness

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 ThicknessThe 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 ThicknessFor 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 MethodsElectro-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 ConsiderationsWhen 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.