Article Overview
Cable trays between cable wells should be installed with proper alignment, secure supports, and continuous grounding to ensure safe and efficient cable routing.
Planning and Preparation
Before installation, review the approved shop drawings to determine the tray layout, length, and location between cable wells, ensuring proper clearance and load capacity . Inspect all materials for damage and verify that the trays, ladders, and fittings match the approved specifications . Store trays horizontally on a flat surface with timber supports at regular intervals to prevent deformation and protect from moisture .
Tray Type and Selection
Choose the appropriate tray type based on cable type and environmental conditions. Ladder trays are ideal for power cables due to ventilation and easy cable entry, while ventilated troughs provide continuous support for smaller control or instrumentation cables . Material selection (steel, aluminum, or FRP) should consider corrosion resistance and mechanical strength .
Support and Alignment
Install center-hung or side-hung supports at intervals recommended for the tray type, typically 1.5 to 3.6 meters apart, depending on load and span . Ensure trays are level, straight, and aligned between cable wells to prevent sagging and facilitate cable pulling . Use proper clamps, brackets, and connectors to secure the trays firmly to structural elements.
Connection Between Cable Wells
When connecting trays between cable wells:
- Use splice plates or tray connectors to join sections securely.
- Maintain continuous grounding and bonding across the entire tray system to comply with NEC Article 392 .
- Ensure smooth transitions to avoid sharp bends or obstructions that could damage cables during installation or maintenance .
- Verify that the tray width and depth accommodate the cable fill without overcrowding, preventing overheating .
Cable Installation
Deposit cables into the tray from each side of the well, using center-hung supports where possible for easier access . Tie cables neatly to the rungs or bottom of the tray using approved cable ties, maintaining separation between power and control cables as required. Avoid over-tightening ties to prevent conductor damage.
Final Checks
After installation, inspect the tray system for:
- Proper alignment and level between wells
- Secure attachment of all supports and connectors
- Continuous grounding and bonding
- Adequate cable spacing and fill capacity Following these steps ensures a safe, code-compliant, and maintainable cable tray system between cable wells .
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