2020 National Standard Thickness for Cable Trays

Cable tray thickness is governed by NEMA VE 1/VE 2 standards, with minimum metal thickness varying by tray type, material, and load class.

Overview of Standards

The National Electrical Manufacturers Association (NEMA) VE 1 and VE 2 standards define the manufacturing requirements for metal cable trays, including ladder, ventilated trough, solid bottom, and channel types, for use in accordance with the National Electrical Code (NEC). These standards specify minimum material thickness, load/span ratings, and construction requirements to ensure structural integrity and safe cable support.

U

L 568 covers fiberglass (nonmetallic) cable trays, specifying performance and thickness requirements for safe application.

Both NEMA V

E 1 and UL 568 are harmonized with the Canadian Electrical Code (CEC), ensuring consistent safety and performance criteria across North America.

Typical Thickness Guidelines

While exact thickness depends on tray type, material, and load class, typical ranges are: Steel cable trays (galvanized or painted): Ladder and ventilated trays: 14–16 gauge (1. 9–2. 5 mm) for standard spansSolid bottom trays: 12–14 gauge (2.

5–3. 0 mm) depending on load requirementsAluminum trays: Ladder and ventilated trays: 1. 5–2.

0 mmSolid bottom trays: 2. 0–2. 5 mmFiberglass trays (UL 568): Thickness varies by load class and span, typically 6–12 mm for standard industrial applications.

Galvanization or coating thickness also affects structural performance. For hot-dip galvanized steel, the zinc coating is applied to all surfaces, including joints, and thickness varies by process, typically 45–85 µm (1. 8–3.

3 mils) for corrosion protection. Load and Span ConsiderationsNEMA VE 1/VE 2 standards classify trays by load/span ratings, which directly influence the required material thickness. Higher loads or longer spans require thicker metal or additional reinforcement.

Engineers must consult the NEMA VE 2 tables for specific thicknesses based on tray width, span, and load class.

Practical Guidance

Always verify the manufacturer's specifications, as thickness may vary slightly depending on production methods and coatings. Ensure compliance with NEC Article 392 for installation and support requirements. For corrosive or outdoor environments, consider hot-dip galvanization or fiberglass trays to meet both structural and environmental standards.

In summary, the 2020 national standard thickness for cable trays is defined by NEMA VE 1/VE 2 and UL 568, with steel trays typically 14–12 gauge, aluminum 1. 5–2. 5 mm, and fiberglass 6–12 mm, adjusted according to load, span, and environmental conditions.

Compliance with these standards ensures safe, durable, and code-compliant cable tray installations.