Yes, socket wiring can be run through cable trays if it complies with NEC Article 392 and the wiring is properly rated, supported, and secured.

Key Considerations

Permissible Wiring Types: Cable trays are designed to support various electrical conductors, including service conductors, feeders, branch circuits, and control circuits (NEC 392.3) . For socket wiring, the conductors must be rated for the voltage and type of installation. Typically, branch circuit cables such as THHN/THWN in conduit or MC cables are suitable for tray installation . Voltage and Separation Requirements: Cables rated 600 volts or less can share the same tray without additional separation, provided tray fill and support requirements are met. Higher voltage cables must either be Type MC or separated by a solid barrier from lower voltage circuits . This ensures safety and prevents electrical interference. Support and Securing: Cables must be secured at intervals according to manufacturer instructions and NEC requirements. For single conductor cables sized 1/0 AWG to 4/0 AWG, the maximum rung spacing is 9 inches (229 mm) . Proper fastening prevents sagging and maintains mechanical integrity. Cable Tray Fill: The tray should not exceed its rated fill capacity. Overfilling can lead to overheating and mechanical stress. Ventilated trays are preferred for heat dissipation, especially when carrying power circuits . Prohibited Uses: Cable trays are intended for electrical conductors only. Mechanical piping, water, air, or other non-electrical services cannot be installed in the same tray . Additionally, certain flexible cords like SO cord are not suitable for tray installations . Practical Tips: Use trays with solid or ventilated bottoms depending on environmental conditions. Ensure bends respect the minimum bend radius of the cables, and consider covers for protection against dust or accidental contact . In summary, socket wiring can be safely routed through cable trays if the cables are properly rated, supported, secured, and installed according to NEC Article 392 and manufacturer guidelines. Proper attention to voltage separation, tray fill, and cable type ensures compliance and long-term reliability.