Standard thickness of galvanized metal cable trays

The typical thickness of galvanized metal cable trays ranges from 1.5 mm to 3 mm for side and base plates, with zinc coating thickness of at least 45 µm for standard components.

Cable Tray Sheet Thickness

The sheet metal thickness for galvanized cable trays generally depends on the tray type and load requirements:

• Side plates and base plates: 1.5 mm to 3 mm is standard for most trays .
• Brackets, supports, and heavier components: Often exceed 3 mm to provide additional mechanical strength .

This thickness ensures adequate structural integrity while supporting the weight of cables and environmental loads. Manufacturers may adjust thickness based on span length, cable load, and installation environment .

Zinc Coating Standards

Galvanized cable trays are coated with zinc to prevent corrosion. The zinc coating thickness is specified as:

• Minimum local thickness: 45 µm (corresponding to a coating mass of 325 g/m²) for standard tray sheets .
• Heavier components: Minimum 55 µm for brackets and supports .
• Hot-dip galvanization: Often applied after fabrication, with typical coating thickness around 0.065 mm (65 µm) per side, meeting ASTM A123/A123M standards .

The coating must be continuous, uniform, and free from defects such as bare spots, blisters, or excessive zinc dross . Damaged areas should be repaired with compatible materials to maintain corrosion protection .

Standards and Compliance

• IEC 61537: International standard for metal cable tray systems, covering mechanical strength, corrosion resistance, and electrical continuity .
• ASTM A123/A123M: Defines hot-dip galvanization requirements for steel components .
• GB/T 26941.1-2011: Specifies electro-galvanized tray coating requirements .

Compliance with these standards ensures long-term durability, safety, and compatibility in electrical installations, including indoor, outdoor, and corrosive environments.

Summary

For standard galvanized metal cable trays:

• Sheet thickness: 1.5–3 mm for side and base plates, >3 mm for heavy supports.
• Zinc coating: Minimum 45 µm for standard components, ≥55 µm for brackets/supports, or 0.065 mm per side for hot-dip galvanized trays.
• Standards: IEC 61537, ASTM A123/A123M, and relevant national or international guidelines ensure quality and corrosion resistance .

These specifications provide a reliable baseline for selecting and installing galvanized cable trays in various electrical and industrial applications.