Thickness of galvanized iron sheet for cable trays

The typical thickness of galvanized iron sheets for cable trays ranges from 1.2 mm to 2.5 mm, with zinc coating thickness around 0.065 mm (65 µm) per side for hot-dip galvanized steel.Standard SpecificationsFor metallic cable trays, carbon steel sheets are commonly used and protected against corrosion by hot-dip galvanization in accordance with ASTM A123/A123M or equivalent standards . The zinc coating weight is typically 460 g/m² per side, corresponding to a coating thickness of 0.065 mm (2.55 mils) per side . This ensures durability in indoor, outdoor, and moderately corrosive environments.Sheet Thickness by Tray TypeLadder-type trays: Usually fabricated from 1.5 mm to 2.5 mm thick galvanized steel sheets, depending on span and load requirements .Trough-type trays: Typically use 1.2 mm to 2.0 mm thick sheets, with perforated or ventilated bottoms for cable ventilation .Mesh or wire trays: Often thinner sheets, around 1.2 mm, as structural strength is provided by the wire mesh design .Galvanization ProcessHot-dip galvanization: Provides full coverage, including edges and cut areas, forming a protective zinc layer that prevents corrosion .Electro-galvanization: Thinner zinc layer, generally used for indoor applications with lower corrosion risk .Repair of damaged areas: Any cuts or scratches on hot-dip galvanized trays should be treated with compatible zinc-rich compounds to maintain corrosion protection .Environmental ConsiderationsFor outdoor or highly corrosive environments, thicker sheets and hot-dip galvanization are recommended.PVC coatings are generally not used on galvanized steel trays, as they can interfere with the protective zinc layer .Aluminum trays may be anodized for outdoor use, but for steel, hot-dip galvanization remains the standard .SummarySheet thickness: 1.2 mm – 2.5 mm depending on tray type and load.Zinc coating thickness: 0.065 mm per side (hot-dip galvanized).Standards: NEMA VE-1, ASTM A123/A123M, or equivalent IEC standards.Application: Indoor, outdoor, and corrosive environments with proper galvanization and maintenance . This ensures that cable trays are mechanically strong, corrosion-resistant, and compliant with international standards for electrical installations.