How to install a trough-type cable tray

Trough-type cable trays are installed as rigid, continuous pathways with solid or ventilated bottoms, providing superior cable support and protection in industrial and commercial settings.

Overview

A trough-type cable tray is a rigid structure designed to support insulated electrical and data cables. Unlike ladder trays, it has a solid or ventilated bottom, offering enhanced protection against dust, moisture, and falling debris, making it ideal for horizontal runs and environments where minimal cable sag is critical . The tray typically includes side rails for structural strength and modular sections for easy customization and expansion .

Pre-Installation Planning

• Route Planning: Review engineering drawings and plan the tray path to avoid obstructions such as pipes, ducts, or HVAC systems .
• Component Verification: Ensure all tray sections, splice plates, supports, and hardware are available and compatible .
• Load Assessment: Calculate the total cable weight and select a tray with a load rating exceeding this weight, considering future cable additions .

Support Structure

• Support Spacing: Install supports at intervals specified by the manufacturer or load capacity charts. Shorter spans allow heavier loads .
• Leveling and Alignment: Ensure supports are level and plumb to maintain structural integrity .
• Anchoring: Secure supports to the building structure using appropriate fasteners to handle the tray and cable weight .

Assembly and Installation

• Tray Connection: Use splice plates and connectors to join tray sections, ensuring smooth internal surfaces to prevent cable jacket abrasion .
• Bend Radius: Maintain the minimum bend radius for cables when routing through turns, tees, or transitions .
• Cable Management: Use cable ties, cleats, or straps to organize cables, separate by voltage or signal type, and prevent stress on terminations .
• Expansion Joints: Install expansion joints in areas with significant temperature fluctuations to accommodate thermal expansion and contraction .

Grounding and Bonding

• Continuous Grounding: Bond the entire tray system to act as a continuous electrical conductor, protecting against fault currents .
• Compliance: Follow NEC and IEC standards for grounding and bonding to ensure safety and code compliance .

Material Selection

• Steel vs. Aluminum: Steel trays offer higher load capacity, while aluminum provides corrosion resistance and lighter weight .
• Solid vs. Ventilated Bottom: Solid bottoms maximize protection for sensitive cables, while ventilated bottoms improve heat dissipation and reduce weight .

Advantages of Trough-Type Trays

• Superior cable protection from dust, moisture, and falling objects .
• Continuous support for smaller-diameter control and data cables, preventing sagging .
• Containment of spills or leaks, reducing risk to equipment and personnel . By following these guidelines, a trough-type cable tray installation can achieve structural integrity, safety compliance, and ease of maintenance, ensuring reliable cable management for industrial and commercial applications .