What is the thickness of the sheet metal for cable trays

Cable tray sheet metal thickness typically ranges from 1.2 mm to 3.0 mm depending on tray type, load, span, and environmental conditions.

Recommended Thickness by Tray Type

• Ladder Cable Trays: Designed for heavy power cables over long spans, ladder trays require 2.0 mm to 3.0 mm thick sheet metal to prevent deflection, twisting, or rung deformation under load .
• Perforated Cable Trays: Balancing weight and strength, perforated trays generally use 1.2 mm to 2.0 mm thick sheets, suitable for standard routing and moderate cable loads .
• Solid Bottom Trays / Raceways: For maximum electromagnetic shielding or environmental isolation, solid-bottom trays typically use 1.5 mm to 2.0 mm thick steel to maintain flat profiles and structural integrity .

Factors Affecting Thickness Selection

1. Load Density: Heavier cable bundles require thicker trays to support cumulative weight without sagging.
2. Support Spacing: Longer spans between supports (e.g., 2.5–3 meters or more) necessitate thicker trays to reduce bending stress .
3. Environmental Conditions: Outdoor, marine, or corrosive environments may require thicker or corrosion-resistant materials (galvanized or stainless steel) to ensure durability .
4. Compliance with Standards:
   • NEMA VE 1 and CSA C22.2 #126.1 provide guidelines for metal cable tray construction, load/span classes, and installation .
   • IEC 61537 specifies mechanical strength, corrosion resistance, and performance criteria for metallic cable trays internationally .
   • BS EN 61537:2023 and related BS EN standards define fabrication and finish requirements for steel trays in Europe .

Practical Guidelines

• Light-duty applications (LAN, control wiring, commercial offices): 1.2–1.6 mm thickness.
• Medium-duty applications (industrial or processing facilities): 1.5–2.0 mm thickness.
• Heavy-duty applications (power plants, substations, marine installations): 2.0–3.0 mm thickness.
• Span Consideration: For spans exceeding 2.5 meters, a minimum of 2.5 mm is recommended to prevent sagging . Selecting the correct sheet metal thickness ensures structural stability, safety, and long-term reliability of cable management systems while complying with international and national standards.