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What is grounding in cable trays

Cable trays must be properly grounded to ensure electrical safety, either by using the tray itself as an equipment grounding conductor (EGC) or by installing a dedicated grounding wire.Purpose of Grounding

Grounding in cable trays provides a safe path for stray electrical currents to flow into the earth, protecting personnel and equipment from electric shocks, fires, and damage caused by electrical faults or surges . It ensures that any fault current is quickly diverted, maintaining system stability and compliance with safety standards .

Methods of Grounding
  1. Using the Cable Tray as the EGC Metallic cable trays can serve as the equipment grounding conductor if they meet NEC requirements. This method is suitable for qualifying facilities where the tray is electrically continuous and properly bonded . All metallic trays must be grounded regardless of whether they are used as the EGC .
  2. Dedicated Grounding Conductor A separate EGC can be installed in or on the cable tray. This conductor should be bonded to each or alternate tray sections using grounding clamps, which also mechanically secure the conductor to prevent displacement under fault conditions .
  3. Individual Cable EGCs Each multi-conductor cable may include its own EGC, which can be connected to the tray or a common grounding system .
Best Practices
  • Material Considerations: Avoid bare copper conductors in aluminum trays to prevent electrolytic corrosion. Use insulated conductors with insulation removed only at bonding points, and employ tin or zinc-plated connectors .
  • Bonding: Ensure all tray sections are electrically continuous. Bonding clamps or connectors should provide both mechanical stability and electrical continuity .
  • Grounding Resistance: Maintain low grounding resistance, ideally 4 ohms or less, to ensure effective fault current conduction .
  • Compliance: Follow NEC Article 392 and Article 250 for grounding and bonding requirements, including minimum conductor sizes and metal area requirements for trays used as EGCs .
Materials for Grounding Conductors
  • Copper Wire: Excellent conductivity, widely used.
  • Hot-Dip Galvanized Steel: Durable and corrosion-resistant.
  • Stainless Steel: Suitable for harsh environments with high corrosion potential .
Summary

Proper grounding of cable trays is essential for electrical safety and system reliability. Depending on the installation, grounding can be achieved by using the tray itself, a dedicated grounding conductor, or individual cable EGCs. Following NEC standards, using appropriate materials, and ensuring mechanical and electrical continuity are key to a safe and compliant cable tray system .

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