A 45° downward cable tray tee allows a branch to descend at a 45° angle from the main tray, providing smooth directional changes while maintaining structural integrity.

Overview

A cable tray tee angled downwards at 45° is a specialized fitting used in cable tray systems to split or branch a tray line while directing cables downward at a 45° angle. This is particularly useful in industrial or commercial installations where cables need to descend to lower levels or connect to equipment without sharp bends that could damage the cables or reduce airflow. These fittings are designed to maintain load capacity and comply with industry standards such as NEMA or BS EN 10346:2015 .

Types and Materials

• Medium Duty Tees: Often made from pre-galvanized steel, suitable for standard commercial applications. They provide durability and corrosion resistance, with punched holes for easy alignment and secure fixing .
• Heavy Duty Tees: Constructed from Zinc Magnesium (ZM) steel, these are designed for higher load capacities and larger cable volumes. They may include integral couplers or fishplates to simplify installation .
• Finish Options: Pre-galvanized, powder-coated, or bespoke finishes are available depending on environmental requirements and aesthetic preferences .

Installation Considerations

• Alignment: Ensure the tee is properly aligned with the main tray and branch to avoid stress on cables. Pre-punched holes or integral couplers facilitate precise installation .
• Fasteners: Use appropriate bolts, nuts, and washers (e.g., M6x16mm for medium duty) to secure the fitting .
• Load Capacity: Verify that the chosen tee can support the weight of the cables and any additional accessories, especially for heavy-duty applications .
• Smooth Transition: A 45° angle provides a gradual descent, reducing strain on cables and maintaining proper bend radius, which is critical for fiber optic or sensitive power cables .

Compatibility

• Ensure the tee matches the width and class of the main cable tray (e.g., 450mm medium duty, 300mm heavy duty) to maintain structural integrity and compliance with standards .
• Check that the side rail flanges and splice plates are compatible with the existing tray system, especially when integrating with NEMA Class 12B, 20A, or higher .

Summary

A 45° downward cable tray tee is an essential fitting for installations requiring a smooth, angled branch from a main tray. Selecting the correct material, duty rating, and size ensures safe, reliable, and code-compliant cable management. Proper installation with aligned fasteners and attention to load capacity will maintain the structural integrity and longevity of the cable tray system .