Practices for grounding and bonding of cable trays
All metallic cable trays shall be grounded as required in Article 250.96 regardless of whether or not the cable tray is being used as an equipment grounding conductor (EGC). The EGC
Cable trays need to be grounded
Yes, all metallic cable trays must be grounded to ensure electrical safety and compliance with NEC standards.NEC and Safety RequirementsMetallic cable trays are required to be grounded according to NEC Article 250.96 and Article 392. Grounding ensures that any fault current is safely conducted to the earth, reducing the risk of electric shock, fire, or equipment damage. Cable trays can serve as the equipment grounding conductor (EGC) in qualifying installations, but even when not used as an EGC, all metallic trays must still be grounded .Bonding PracticesCable tray sections should be electrically continuous. This is achieved by bonding adjacent tray sections using clamps, connectors, or bonding jumpers. If an EGC is installed within the tray, it should be bonded to each or alternate tray sections to maintain mechanical stability and electrical continuity under fault conditions . Both side rails of ladder or trough trays must be bonded together to the next section, and the tray system must be bonded back to the power source .Material ConsiderationsAluminum trays: Avoid using bare copper EGCs due to potential electrolytic corrosion; insulated conductors with exposed bonding points are recommended .Steel trays: Cannot be used as the sole EGC for circuits with ground-fault protection above 600 amperes .Additional Grounding ConsiderationsCable trays carrying signal or communication circuits should also be grounded to prevent electrical noise, lightning damage, and electromagnetic interference .Grounding resistance should ideally be 4 ohms or less to ensure effective fault current dissipation .Proper grounding improves system stability, protects equipment, and ensures compliance with inspections and safety regulations .SummaryGrounding metallic cable trays is mandatory for safety and NEC compliance. Whether the tray serves as the EGC or a separate grounding conductor is used, all sections must be bonded, electrically continuous, and connected to the building's grounding system. Following these practices ensures protection against electrical faults, reduces fire and shock hazards, and maintains system reliability .
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