National Standard for Cable Tray Thickness 2022

Cable tray thickness is determined by tray type, material, and duty class, with NEMA VE 1 and UL 568 providing the primary 2022 standards for metallic and nonmetallic trays.

Standard Thickness Guidelines

Metallic Cable Trays (Steel or Aluminum):

• Thickness varies by tray type (ladder, ventilated, solid bottom, channel) and duty class (light, medium, heavy).
• Typical steel ladder trays: 1.5 mm to 3.0 mm for light to heavy duty, with side rails often thicker for rigidity.
• Aluminum trays: slightly thinner than steel for equivalent load, generally 1.2 mm to 2.5 mm depending on span and load requirements.
• Thickness is influenced by load/span class, which defines the maximum allowable deflection under rated load according to NEMA VE 1 and CSA C22.2 #126.1 standards . Nonmetallic Cable Trays (Fiberglass or PVC):
• Governed by UL 568 and IEC 61537 standards.
• Thickness depends on tray width, height, and load rating, typically ranging from 3 mm to 6 mm for standard ladder or solid-bottom trays.
• Nonmetallic trays are designed to meet mechanical strength and fire resistance requirements while maintaining lightweight construction . Channel and Wire Mesh Trays:
• Channel trays: used for light-duty applications, thickness usually 1.2 mm to 2 mm.
• Wire mesh (basket) trays: thickness determined by wire diameter, commonly 3 mm to 5 mm, with spacing affecting load capacity .

Additional Considerations

• Material finish: Stainless steel trays (BS EN 10088-2 Grade 1.4401 / ASTM 316) may have slightly different thicknesses due to corrosion resistance and rigidity requirements .
• Perforation patterns: Ventilated trays have reduced usable area, so thickness must account for structural integrity.
• Installation environment: Outdoor or tropical climates may require thicker trays or additional coatings to withstand handling and environmental exposure .

Summary

The 2022 national standard thickness for cable trays is not a single fixed value but a range based on material, tray type, and duty class. For metallic trays, steel typically ranges from 1.5 mm to 3 mm, aluminum from 1.2 mm to 2.5 mm, and nonmetallic trays from 3 mm to 6 mm. Designers should consult NEMA VE 1, UL 568, and IEC 61537 for precise specifications, ensuring compliance with load, span, and environmental requirements .