New National Standard Thickness Specifications for Galvanized Cable Trays

The latest national standard specifies steel tray thicknesses from 1.2mm to 3mm and zinc coating thicknesses of ≥12µm for electro-galvanized and ≥65µm for hot-dip galvanized trays.Steel Tray Thickness...

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New National Standard Thickness Specifications for Galvanized Cable Trays

The latest national standard specifies steel tray thicknesses from 1.2mm to 3mm and zinc coating thicknesses of ≥12µm for electro-galvanized and ≥65µm for hot-dip galvanized trays.Steel Tray ThicknessAccording to the T/CECS 31-2017 standard, the steel thickness of cable tray components depends on the tray type and width:Side plates and rungs: Minimum 1.2mm for ladder trays with widths between 150mm and 400mm.Cover plates: Minimum 0.6mm for the same width range.For wider trays (500–800mm), steel bridge thickness should be 2.0mm, aluminum alloy ≥2.2mm, and fiberglass ≥4.5mm .Typical tray sheet metal thickness ranges from 1.5mm to 3mm, with heavier components like brackets and supports often exceeding 3mm .Zinc Coating ThicknessThe zinc coating thickness is determined by the galvanization method and environmental conditions:Electro-galvanized trays: Minimum zinc layer thickness ≥12µm, suitable for indoor general corrosion environments .Hot-dip galvanized trays: Minimum zinc layer thickness ≥65µm (coating weight ~460 g/m² per side), suitable for outdoor or highly corrosive environments .Hot-dip galvanizing provides superior bonding, durability, and maintenance-free protection compared to electro-galvanization .Additional RequirementsThe galvanized coating must be continuous, uniform, and free of defects such as bare spots, blisters, or excessive zinc dross .Damaged areas in hot-dip galvanized trays must be repaired with compatible materials to maintain coating integrity .The coating thickness is measured both as local thickness (minimum at any point) and mean coating mass (average over the entire surface) to ensure compliance .SummaryFor modern galvanized cable trays under national standards:Steel thickness: 1.2–3mm depending on tray type and width.Zinc coating: ≥12µm for electro-galvanized (indoor), ≥65µm for hot-dip galvanized (outdoor or corrosive environments).Quality: Coating must be uniform, continuous, and repaired if damaged. These specifications ensure structural integrity, corrosion resistance, and long service life for cable tray installations in various environments .
National Standard Thickness Specifications

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