Can cable trays pass through stairwells
Cable trays can pass through stairwells if proper clearance, accessibility, and firestopping measures are maintained according to NEC and industry best practices.
Code Compliance and Safety
Cable trays are permitted to extend vertically through floors, platforms, or partitions, which includes stairwell areas, provided the installation meets firestopping requirements outlined in NEC Section 300.21 and Sec. 392.18(D) for metal cable trays . This ensures that the tray does not compromise the fire-resistance rating of the stairwell or building structure. The tray must remain exposed and accessible for maintenance, as required by Sec. 392.18(E), and sufficient space must be maintained around the tray for safe access .
Mechanical and Structural Considerations
When routing cable trays through stairwells, ensure that the tray is mechanically supported and aligned properly. Avoid placing foreign objects or structural elements through the tray unless they are fire-resistant and do not interfere with cable support . Perforated or wire mesh trays are recommended to improve airflow and prevent heat accumulation, which is especially important in vertical runs through confined spaces like stairwells .
Fireproofing and Penetration Sealing
Any openings created for cable trays in stairwell floors or walls must be sealed with fire-rated penetration materials to maintain the integrity of fire barriers . Fireproof trays should be used only for flame containment or isolation, and the tray coating or structure should not be modified or damaged during installation.
Access and Maintenance
Design the tray path to be as direct and linear as possible, avoiding unnecessary bends or obstacles that could hinder maintenance personnel . Ensure that lighting, ventilation, and clearance are adequate for safe access, and schedule periodic inspections to check for corrosion, deformation, or compromised fireproofing .
Summary
In conclusion, cable trays can pass through stairwells if the installation:
- Complies with NEC firestopping and accessibility requirements
- Maintains proper mechanical support and alignment
- Uses fireproofing and penetration sealing where necessary
- Provides sufficient clearance for maintenance and heat dissipation Following these guidelines ensures both safety and code compliance while allowing cable trays to traverse stairwell areas effectively.
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