Thickness of Angle Steel for Cable Trays

The required thickness of angle steel for cable tray supports depends on the tray load, span between supports, and environmental conditions, typically ranging from 3 mm to 6 mm for standard indoor installations. Key Considerations1. Load and Span: The thickness of angle steel must be selected based on the weight of the cables and any environmental loads such as wind, snow, or ice.

Short-span trays (6–8 feet) can use thinner angles, while long-span trays (14–20 feet or more) require thicker steel to prevent deflection and maintain structural integrity. 2. Material and Strength: Angle steel is usually made from mild steel or galvanized steel.

Galvanized or stainless steel is preferred in corrosive environments. The steel must meet mechanical strength requirements to support the cable tray without excessive bending. 3.

Standards Compliance: Cable tray supports should comply with IEC 61537 and NEMA VE-1/VE-2 standards, which define load testing, support spacing, and installation practices. These standards ensure that the selected angle steel thickness is sufficient for the intended application. 4.

Typical Thickness Ranges: Indoor, short-span installations: 3–4 mm thick angle steel is generally sufficient. Medium-span installations (10–12 feet): 4–5 mm thickness is recommended. Long-span or heavy-load installations: 5–6 mm or more may be required, especially for outdoor or industrial environments.

5. Corrosion Protection: For outdoor or humid environments, hot-dip galvanization or powder coating is recommended to prevent rust and maintain structural strength over time. 6.

Support Placement: Supports are typically placed at 1/4 span intervals to minimize stress at splice points, which can influence the required thickness of the angle steel.

Practical Tip

Always calculate the maximum expected load including cables, conduit, and environmental factors, then select angle steel with a safety factor of at least 1. 5. Consulting manufacturer load tables or structural engineers is recommended for spans exceeding 20 feet or for heavy industrial installations.

By considering span, load, material, and environmental conditions, you can select the appropriate angle steel thickness to ensure a safe and durable cable tray support system.