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Fireproof cable tray grounding hole

Fireproof cable tray grounding hole

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Fireproof cable tray grounding hole - BENNIE OPTICAL [PDF]

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Grounding holes in fireproof cable trays are used to bond the tray to the electrical grounding system while maintaining firestopping integrity and compliance with NEC standards.

Purpose of Grounding Holes

Grounding holes in metallic cable trays allow for secure attachment of grounding clamps or conductors, ensuring the tray can function as an Equipment Grounding Conductor (EGC). Proper grounding prevents electrical shock hazards and ensures fault currents are safely conducted to the earth, protecting both personnel and equipment .

Fireproofing Considerations

When installing fireproof cable trays, all penetrations, including grounding holes, must maintain the fire-resistance rating of the tray system. This involves:

  • Sealing gaps around cables and tray penetrations with firestop materials such as fire-rated boards, mineral wool, or intumescent caulks .
  • Ensuring that any holes drilled for grounding do not compromise the tray's structural integrity or fireproof coating .
  • Using aluminum or steel trays with appropriate coatings for fire resistance, and inspecting periodically for coating integrity .

Installation Guidelines

  • Clamp Attachment: Grounding clamps should be installed at each tray section or at alternate sections to bond the tray to the EGC. This provides both electrical continuity and mechanical stability under fault conditions .
  • Material Compatibility: Avoid bare copper conductors in aluminum trays to prevent electrolytic corrosion. Use insulated conductors and remove insulation only at bonding points with tin- or zinc-plated connectors .
  • Hole Size and Placement: Holes should be sized to accommodate the grounding hardware without weakening the tray. For aluminum trays, field-drilled holes are typically 13/32” in diameter for side rails .
  • Compliance: Follow NEC Article 392 for metallic tray grounding, ensuring the tray meets minimum cross-sectional area requirements for the intended fault current rating .

Maintenance and Inspection

  • Periodically inspect fireproof trays for coating damage, corrosion, or loose grounding connections.
  • Ensure firestop seals around tray penetrations remain intact and free of cracks or voids . By following these guidelines, grounding holes in fireproof cable trays can provide safe, code-compliant electrical bonding while maintaining the tray's fire-resistance performance.
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