Thickness of galvanized ladder-type cable trays

Galvanized ladder-type cable trays typically have zinc coating thicknesses ranging from 10–85 microns depending on whether they are pre-galvanized or hot-dip galvanized. Galvanization Types and ThicknessPre-galvanized (GI) trays are coated with zinc at the factory before fabrication. The zinc layer is generally thin, around 10–25 microns, providing basic corrosion protection suitable for indoor, dry environments such as offices or warehouses.

These trays are lighter, less expensive, and have a smooth, shiny finish. Hot-dip galvanized (HDG) trays are fully fabricated and then dipped in molten zinc, which coats all surfaces, including edges and joints. The zinc layer is much thicker, typically 60–85 microns, offering superior corrosion resistance, especially in harsh or outdoor environments, coastal areas, or near chemical plants.

HD

G trays are heavier and more durable, providing 4–5 times the zinc protection compared to pre-galvanized trays. Ladder Tray ConstructionLadder-type trays consist of two strong side rails connected by rungs, with typical rung spacing between 225 mm and 300 mm to support large power cables while allowing airflow for heat dissipation. The thickness of the side rails and rungs is designed to maintain structural integrity under load, and the galvanization layer adds sacrificial protection against corrosion.

Corrosion Protection Considerations

The corrosion resistance of galvanized trays is directly related to the zinc coating thickness. Thicker coatings provide longer service life in aggressive environments. Pre-galvanized trays are suitable for indoor use, while hot-dip galvanized trays are recommended for outdoor or chemically aggressive environments.

The protective zinc layer forms a patina over time, further enhancing durability. SummaryPre-galvanized (GI) ladder trays: 10–25 microns zinc coating, suitable for indoor dry environments. Hot-dip galvanized (HDG) ladder trays: 60–85 microns zinc coating, ideal for outdoor or corrosive environments.

Rung spacing: 225–300 mm for large cables, ensuring airflow and heat dissipation. Selection tip: Choose HDG for coastal, chemical, or high-moisture areas to prevent structural failure and extend service life. This information ensures proper selection of galvanized ladder-type cable trays based on environmental conditions, load requirements, and expected lifespan.