Metallic cable trays can serve as the equipment grounding conductor in installations where qualified personnel service the system, provided the tray meets the minimum cross-sectional area requirements for the expected fault current . Steel trays should not be used as EGCs for circuits with ground-fault protection above 600 A, and aluminum trays should not be used above 2000 A . The tray must be electrically continuous, and all sections should be bonded to maintain a low-impedance path for fault currents .
To ensure electrical continuity, bonding jumpers should be installed between adjacent tray sections, supports, and accessories. These jumpers provide a reliable path for fault currents and minimize touch and step potentials . Mechanical connections alone may not guarantee continuity, so bonding clamps or jumpers are recommended, especially in fire-resistant installations where thermal expansion or mechanical stress could compromise connections .
If a separate EGC is used, it should be insulated when installed in aluminum trays to prevent electrolytic corrosion, with insulation removed only at bonding points using tin- or zinc-plated connectors . The conductor size must be calculated based on maximum fault current, distance to the grounding electrode, and desired fault clearing time, following NEC or IEC guidelines . Copper is preferred for its conductivity and corrosion resistance.
The cable tray system must be securely connected to the facility's grounding electrode system, which may include ground rods, plates, water pipes, or concrete-encased electrodes, depending on local soil conditions and fault current requirements . This ensures that any fault current is safely directed to ground, reducing the risk of electric shock, equipment damage, or fire.
Steel and aluminum cable tray systems can serve as equipment grounding conductors if specific criteria are met. These include
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