Galvanized steel plates for cable trays typically range from 1.5 mm to 3 mm in thickness, with zinc coating thickness of 0.065 mm (65 µm) per side for hot-dip galvanization.

Steel Plate Thickness

The side plates and base plates of standard cable trays are generally 1.5 mm to 3 mm thick, depending on the tray type, width, and load requirements . For smaller trays or widths up to 300 mm, a 1.0 mm thickness may be used, while larger trays or heavy-duty applications require thicker plates . The thickness ensures mechanical strength and stability under the weight of cables and environmental loads. Brackets and supports, which are heavier components, often exceed 3 mm in thickness .

Zinc Coating Thickness

For hot-dip galvanized (HDG) steel, the minimum zinc coating thickness is typically 0.065 mm (65 µm) per side, corresponding to a coating weight of approximately 460 g/m² per side . This provides sacrificial protection against corrosion, forming a protective zinc oxide and zinc carbonate layer over time . In outdoor or highly corrosive environments, HDG is preferred over electro-galvanized trays, which have a lower minimum zinc thickness of around 12 µm and offer limited corrosion resistance .

Standards and Considerations

• ASTM A123/A123M is commonly referenced for hot-dip galvanization of carbon steel cable trays .
• NEMA VE-1 specifies ladder tray spacing and mechanical requirements .
• Damaged areas of galvanized trays should be repaired with compatible zinc-rich compounds to maintain corrosion protection .
• For outdoor installations or corrosive environments, HDG or anodized aluminum is recommended, while PVC coatings are not suitable for galvanized steel .

Summary

• Standard tray plate thickness: 1.5–3 mm (1.0 mm for small widths)
• Hot-dip galvanized zinc coating: 0.065 mm (65 µm) per side, 460 g/m²
• Electro-galvanized coating: minimum 12 µm, suitable for less corrosive environments
• Environmental considerations: HDG preferred for outdoor or corrosive conditions, repair damaged areas to maintain protection . This ensures both mechanical strength and long-term corrosion resistance for cable tray installations.