Table of Outer Diameter Dimensions for Cable Tray Elbows

Cable tray elbows are standardized to match nominal tray sizes, with outside diameters corresponding to the tray width and height for proper fit and installation.

Standard Elbow Dimensions

Cable tray elbows are designed to maintain continuity of the tray system while allowing directional changes. The outer diameter (OD) of an elbow is typically based on the nominal width and height of the straight tray section it connects to. Elbows are available in 90° and 45° angles, with long radius (LR) and short radius (SR) options to accommodate different bending requirements.

Example Table of Cable Tray Elbow Dimensions

Nominal Tray Width (mm)Tray Height (mm)Elbow TypeOutside Diameter (OD, mm)Center-to-End (mm)1005090° LR1201501005090° SR1201001507090° LR1702001507090° SR17014020010090° LR22025020010090° SR22018030012090° LR32035030012090° SR320250Notes: Long Radius (LR) elbows have a centerline radius approximately 1. 5 times the nominal width, providing smoother cable bends and reducing stress on cables. Short Radius (SR) elbows have a centerline radius equal to the nominal width, suitable for tight spaces but may require careful cable management.

The outside diameter includes the tray side rails and any flange extensions, ensuring proper clearance when connecting to straight sections. Heights and widths should match the straight tray sections to maintain structural integrity and code compliance.

Selection Guidelines

Match the elbow OD to the tray width and height to ensure proper fit.

Choose L

R elbows for high-density or sensitive cables to minimize bending stress. Verify center-to-end dimensions to plan installation space and avoid interference with walls or other equipment. Check material and finish (e.g., hot-dip galvanized, stainless steel) for environmental compatibility.

This table provides a practical reference for engineers, contractors, and project managers to select cable tray elbows that are dimensionally compatible with standard tray systems and maintain proper cable routing.