How to arrange cable trays in the corridor

Yes, cable trays can be installed in corridors if proper clearances, accessibility, and code requirements are met.

Feasibility and Best Practices

Cable trays are commonly installed in service corridors, electrical rooms, and plant areas to support power, control, and communication cables while maintaining organization and accessibility. When installing in a corridor, the following considerations are critical: Clearance: Maintain sufficient vertical clearance above the tray for installation, inspection, and maintenance.

NE

C 392 recommends at least 12 inches of vertical clearance above trays. Accessibility: Trays must remain accessible at all times; they cannot be installed in enclosed spaces or obstruct walkways. Ensure that trays do not block emergency exits or impede personnel movement.

Tray Type: Ladder trays are preferred for heavy power cables due to better ventilation, while solid-bottom or ventilated trough trays may be used for sensitive or smaller cables. Cable Segregation: Separate high-power, low-power, and data cables to prevent electromagnetic interference (EMI). Dedicated trays or compartments are recommended for different cable types.

Load and Fill: Avoid overloading trays. Power cables should not exceed 40% of the tray cross-section, and control cables should not exceed 50%. Proper sizing ensures heat dissipation and prevents mechanical stress.

Fire Safety: Use fire-resistant or low-smoke, zero-halogen (LSZH) cables in corridors, especially in public or escape routes. Covers may be required in areas prone to debris or accidental contact. Support and Grounding: Secure trays at regular intervals according to manufacturer specifications and building codes.

Metallic trays may serve as grounding conductors if compliant.

Summary

Installing cable trays in corridors is permissible and widely practiced in commercial and industrial buildings, provided that: Adequate clearance and accessibility are maintained. Cable segregation and fill limits are observed. Fire safety and grounding requirements are met.

The installation complies with NEC 392 and local building codes. Following these guidelines ensures a safe, organized, and maintainable cable tray system in corridor spaces.