Grounding of flat iron for cable tray support

A flat iron connection inside a cable tray should be properly bonded to the tray using approved grounding conductors or clamps to ensure electrical continuity and safety.Using the Cable Tray as an Equipment Grounding Conductor (EGC)Metallic cable trays can serve as the equipment grounding conductor if they meet NEC requirements for cross-sectional area and conductivity . When using the tray as an EGC:Ensure the tray is electrically continuous across all sections, either via bolted connections or bonding jumpers .Bond the flat iron to the tray using tin- or zinc-plated connectors to prevent corrosion, especially if the tray is aluminum .Avoid placing bare copper conductors directly in aluminum trays in moist environments; use insulated conductors with exposed ends at bonding points .Grounding Methods for Flat Iron ConnectionsDirect Bonding to Tray Sections: Attach the flat iron to the tray using mechanical clamps or bolted connections. This ensures both electrical continuity and mechanical stability under fault conditions .Using a Dedicated Grounding Conductor: Run a single insulated EGC along the tray and bond it to the flat iron at each section. This is recommended for added reliability and is compliant with NEC Section 250-95 .Bonding Jumpers: Required at adjustable or expansion splice plates or discontinuous tray sections to maintain a continuous grounding path .Material and Safety ConsiderationsUse copper, tin-plated copper, or stainless steel for connectors and grounding conductors to resist corrosion .Ensure the grounding path has low impedance to safely carry fault currents and facilitate operation of protective devices .Inspect the grounding system before energizing the cables to verify continuity and compliance with NEC Sections 250.96 and 392.60 .Best PracticesMaintain mechanical stability of the flat iron connection to prevent dislodging during fault currents .Verify that the tray and bonding meet the minimum cross-sectional area for the circuit's protective device rating .Consider using both the tray and a dedicated EGC for critical installations to enhance safety and reliability . By following these practices, the flat iron connection inside a cable tray will be safely grounded, electrically continuous, and compliant with NEC standards, reducing the risk of electrical hazards and equipment damage.