Thickness of cold-galvanized cable trays

Cold-galvanized cable trays typically have a base metal thickness of 1. 5–3 mm with a zinc coating of at least 45 µm, increasing for heavier components.

Base Metal Thickness

The sheet metal thickness for cable trays generally ranges from 1. 5 mm to 3 mm for side plates and base plates. Heavier components such as brackets and supports, which are often thicker than 3 mm, may require additional coating standards to ensure durability and corrosion resistance.

Zinc Coating Thickness

For cold-galvanized (electro-galvanized) trays: Local thickness: The minimum zinc thickness at any single test point should be 45 µm for standard tray sheets, corresponding to a coating mass of 325 g/m². Heavier components like brackets and supports require a minimum of 55 µm. Mean coating mass: This is the average zinc mass per unit area of the entire tray, determined gravimetrically, ensuring uniform protection across the surface.

Appearance: The coating must be continuous, uniform, and smooth. Minor defects like dull areas, passivation films, or water marks are acceptable, but functional defects such as bare spots, blisters, or excessive zinc dross are not permitted. Standards and ComplianceElectro-galvanized trays are typically manufactured according to GB/T 26941.

1-2011 or equivalent international standards. The coating thickness is a linear function of the galvanization process and is critical for corrosion resistance, especially in industrial or outdoor environments.

Summary

Standard tray sheets: 1. 5–3 mm thick, zinc ≥ 45 µmBrackets/supports: >3 mm thick, zinc ≥ 55 µmCoating quality: Continuous, uniform, defect-free for functional areasStandards: GB/T 26941. 1-2011 for electro-galvanized trays, with testing for local thickness and mean coating mass.

This ensures that cold-galvanized cable trays provide adequate mechanical strength and corrosion protection for industrial and commercial installations.