Grounding can be connected to the cable tray

Cable trays must be properly grounded and bonded to ensure electrical safety, prevent shocks, and maintain system reliability.Purpose of Grounding Cable TraysGrounding a cable tray provides a safe path for fault currents, preventing electric shocks, equipment damage, and fire hazards. It also reduces electrical noise and stabilizes voltage levels, which is especially important in industrial and data center environments where sensitive equipment is used . Grounding ensures that any electrical leakage from cables or tray surfaces is safely directed to the earth .Using Cable Trays as Equipment Grounding ConductorsMetallic cable trays can serve as the Equipment Grounding Conductor (EGC) if they meet specific cross-sectional area requirements and are installed in accordance with NEC Article 392 . Steel trays are generally limited to circuits with ground-fault protection below 600 amperes, while aluminum trays are limited to 2000 amperes . When a separate EGC is installed in the tray, it should be bonded to each or alternate tray sections using grounding clamps to maintain electrical continuity and mechanical stability .Bonding Between Tray SectionsBonding ensures that all metallic components of the tray system are electrically connected, maintaining equal potential across the system. This prevents voltage differences that could cause arcing, system failures, or electromagnetic interference . Bonding jumpers, typically thick copper or green wires, are used to connect tray sections, and connections should be inspected for low resistance (less than 0.01 ohms) to confirm safety .Installation ConsiderationsInsulated Conductors: In aluminum trays, use insulated conductors to prevent electrolytic corrosion, removing insulation only at bonding points with tin or zinc-plated connectors .Tray Fill and Separation: Ensure proper separation of power, control, and data cables to reduce interference and heat buildup .Inspection: Regularly check joints, expansion points, and bonding connections to prevent loose screws or corrosion that could compromise grounding .SummaryProper grounding and bonding of cable trays is mandatory for safety and compliance. It involves connecting the tray to the earth, bonding all metallic sections, and following NEC and manufacturer guidelines. Regular inspection and use of appropriate materials, such as insulated conductors and plated connectors, ensure long-term reliability and protection for both personnel and equipment .