Should cable trays be used for wiring in charging stations

Yes, cable trays are suitable and widely used for routing power and communication cables in EV charging stations, provided NEC standards and proper installation practices are followed.

Suitability and Benefits

Cable trays serve as structural support systems for electrical wiring, offering an organized and maintainable way to route cables from switchboards to EV chargers, especially in commercial or multi-charger installations such as parking garages and depots. They help prevent tangled wires, reduce tripping hazards, and allow for future expansion of charging infrastructure. Cable trays can carry both power and communication cables, including Ethernet and fiber optics, while maintaining proper separation and ventilation.

NEC Compliance

According to NEC Article 392, cable trays can support various wiring methods, including service conductors, feeders, branch circuits, control circuits, and signaling circuits. Key compliance points include: Only approved tray-rated cables should be installed. Metallic trays must be properly grounded and bonded.

Tray fill limits must be calculated to avoid overheating. Separation of power and data cables is required to prevent interference. Firestop systems must be used at penetrations through fire-rated walls or floors.

Cables rated above 600 volts require either Type MC or a solid barrier separation from lower voltage cables, while cables rated 600 volts or less can share the same tray if NEC fill and support requirements are met.

Installation Considerations

Cable trays can be mounted on brackets, hangers, or supports and include bends, tees, and risers to navigate obstacles. Outdoor installations may require weatherproof cables or additional conduit protection. Bending radius, cable weight, and ventilation must be considered to prevent damage and overheating.

Wire mesh trays are often preferred for EV charging sites due to improved airflow, easier grounding, and simplified inspection.

Practical Applications

In multi-level parking garages or commercial EV charging sites, cable trays often act as the backbone for distributing circuits to multiple charger locations. They allow for organized routing of multiple circuits, reduce maintenance complexity, and enhance safety by keeping cables off the floor and away from high-traffic areas.

Conclusion

Cable trays are a safe, efficient, and code-compliant solution for wiring EV charging stations when installed according to NEC standards. They provide flexibility, scalability, and protection for both power and communication cables, making them ideal for commercial, industrial, and large residential EV charging setups.