National Standard Thickness of Low Voltage Galvanized Cable Trays

For low voltage galvanized cable trays, the standard steel thickness typically ranges from 1. 2mm to 2. 0mm for side plates and rungs, with zinc coating thickness varying by galvanization method.

Steel Thickness Standards

According to the T/CECS 31-2017 standard, for ladder-type cable trays with widths between 150mm and 400mm, the side plates and rungs should have a minimum thickness of 1. 2mm, while the cover plate should be at least 0. 6mm thick.

For wider trays (500mm to 800mm), steel trays require a minimum thickness of 2. 0mm to ensure structural integrity and load-bearing capacity. Typical low voltage cable trays used in industrial and civil buildings fall within these ranges.

Zinc Coating Requirements

The corrosion resistance of galvanized trays depends on the zinc layer thickness. For hot-dip galvanized (HDG) trays, the zinc coating is thicker and more durable, providing long-term protection in indoor and outdoor environments. The minimum local zinc thickness for standard tray components (1.

5mm–3mm steel) is 45µm, corresponding to a coating mass of at least 325g/m². Heavier components like brackets and supports (>3mm) require ≥55µm zinc thickness. For electro-galvanized trays, which are generally used in dry indoor environments, the minimum zinc coating thickness is 12µm, offering limited corrosion resistance compared to HDG trays.

Summary

Side plates and rungs: 1. 2mm–2. 0mm depending on tray widthCover plates: 0.

6mm minimumHot-dip galvanized zinc coating: ≥45µm for standard components, ≥55µm for heavy componentsElectro-galvanized zinc coating: ≥12µm, suitable for indoor dry conditions These standards ensure that low voltage cable trays meet mechanical strength, durability, and corrosion resistance requirements for safe and reliable electrical installations.