Yes, electrical cables rated for open-air environments can be placed in a cable tray, provided installation follows NEC guidelines and tray specifications.

Cable Tray Purpose and Types

Cable trays are support structures designed to route and secure electrical, power, signal, and communication cables. They differ from conduit systems by providing an open or partially enclosed pathway, which allows for better ventilation, heat dissipation, and easy access for maintenance. Common types include ladder trays, troughs, solid-bottom trays, and wire mesh trays, each offering varying levels of protection and airflow depending on the application .

Installation Guidelines

• Cable Types: Only use cables rated for open-air environments, such as Tray Rated (Type TC) or Metal-Clad (Type MC) cables .
• Fill Limits: Power cables should not exceed 40% of the tray's cross-sectional area, and control cables should not exceed 50% .
• Separation: High-power and low-power cables must be separated to prevent electromagnetic interference (EMI) .
• Clearances: Maintain at least 12 inches of vertical clearance above trays for installation and maintenance .
• Prohibited Items: Mechanical piping, water, air, gas, or drainage tubes cannot be installed in cable trays containing electrical conductors .

Additional Considerations

• Support and Bending: Ensure proper support spacing and respect the minimum bending radius of cables to prevent damage .
• Future Expansion: Allow at least 30% extra capacity for future cable additions .
• Material Selection: Choose tray material (aluminum, steel, or FRP) based on environmental conditions and load requirements .

Summary

If the item in question is an electrical cable rated for tray use, it can safely be installed in a cable tray following NEC 392 rules and manufacturer guidelines. Avoid placing non-electrical items or piping in the tray, maintain proper fill and separation, and ensure adequate support and clearance for long-term safety and compliance .