Covered or enclosed cable trays typically have material thicknesses ranging from 0.8 mm to 2.0 mm depending on duty class, material, and environmental requirements.

Standard Material Thickness

The thickness of a covered cable tray depends on the tray type, load requirements, and material:

• Light-duty trays: Usually around 0.8–1.0 mm for steel or aluminum, suitable for small control or instrumentation cables .
• Medium-duty trays: Typically 1.2–1.5 mm, used for moderate cable loads in commercial or industrial applications .
• Heavy-duty trays: Can range from 1.6–2.0 mm or more, designed for large power cables or long spans where structural strength is critical .

Material and Coating Considerations

• Galvanized steel: Thickness may vary depending on the galvanization process. Hot-dip galvanization adds a zinc coating, which can slightly increase the effective thickness and corrosion resistance .
• Aluminum trays: Typically lighter but may require slightly thicker walls to achieve similar load capacity.
• Stainless steel: Often used in corrosive environments; thickness is selected based on mechanical strength and environmental exposure .

Design Implications

• Load capacity: Thicker sidewalls and bottom panels increase the tray's ability to support heavier cables and reduce deflection.
• Environmental factors: Outdoor or corrosive environments may require thicker material or additional coatings to prevent degradation.
• Standards compliance: Thickness should comply with NEMA, NEC, or IEC standards for the specific tray type and duty class .

Practical Tip

When selecting a covered cable tray, always consider both the nominal thickness and the coating. For example, a 1.2 mm steel tray with hot-dip galvanization may have slightly higher effective thickness and improved durability compared to the same tray without coating . Additionally, verify that the tray thickness aligns with the span length, cable weight, and installation environment to ensure safety and longevity.