Metallic cable trays can serve as an equipment grounding conductor (EGC) if they are electrically continuous and properly bonded at all splice points. Mechanical connections alone may not ensure reliable continuity, so bonding jumpers are often required to maintain a safe grounding path. All tray sections should be mechanically tight and electrically continuous, with connections made using UL-listed connectors to ensure proper electrical contact between the tray and conduits or cables .
The cross-sectional area of the tray side rails determines whether the tray can function as an EGC. NEC Table 392.60(A) specifies the minimum metal area required for aluminum or steel trays based on the highest rating of any protective device (fuse or circuit breaker) in the tray. If the tray's cross-section is insufficient, a separate EGC conductor must be installed within the tray or included in each multiconductor cable . For single-conductor EGC cables, #4 AWG or larger may be used, sized according to NEC Table 250-95 for the highest capacity circuit .
Grounding ensures that fault currents are safely conducted, limiting voltage to ground and facilitating the operation of protective devices. Properly installed EGCs reduce the risk of shock hazards, equipment damage, and failed inspections. All installations must comply with NEC Article 392 and related sections (110-10, 250-1(f), 250-51, 318-6(a), 318-3(b)(1)) to ensure safety and regulatory compliance . By following these requirements, electrical cable tray systems can provide a safe, reliable, and code-compliant grounding path for industrial and commercial installations.
All metallic cable trays shall be grounded as required in Article 250.96 regardless of whether or not the cable tray is
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