Cable trays can safely pass through a light well if proper support, clearance, and NEC compliance are maintained.Key Considerations1. Tray Type and Material: Choose a cable tray suitable for the envir...
Cable trays can safely pass through a light well if proper support, clearance, and NEC compliance are maintained.
1. Tray Type and Material: Choose a cable tray suitable for the environment. Ladder trays are ideal for power cables due to excellent ventilation, while ventilated troughs or solid-bottom trays provide better support for control or instrumentation cables. For areas exposed to moisture or corrosive conditions, consider fiberglass-reinforced plastic (FRP) or stainless steel trays for corrosion resistance and safety .
2. Support and Clearance: When passing through a light well, ensure the tray is securely supported at intervals according to the tray type and load. Ladder trays can span up to 20 feet between supports depending on cable weight, while solid-bottom trays may require closer spacing. Supports should prevent sagging and stress on cables, especially at entry and exit points of the light well .
3. NEC Compliance: Follow NEC Article 392 for installation requirements, including fill limits, grounding, and separation of power and communication cables. Ensure that cables are secured to the tray at intervals specified by the manufacturer and that the tray does not exceed maximum fill capacity to prevent overheating .
4. Cable Management: Use listed cable ties or clamps to secure cables, particularly in vertical runs through the light well. Maintain proper separation between high-voltage and low-voltage cables if required, and avoid sharp bends that could damage insulation .
5. Environmental Considerations: Light wells may expose trays to sunlight, moisture, or temperature variations. Select materials and finishes that resist corrosion and UV degradation. Aluminum, stainless steel, or FRP trays are commonly used for such conditions .
By following these guidelines, a cable tray can be safely and efficiently routed through a light well while maintaining compliance with electrical codes and ensuring long-term reliability .
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