ZITHA SPECIALTYSPECIALTY FIBER CABLES Technical Inquiry

What is the grounding strip of the cable tray called

The grounding strip of a cable tray is commonly called an "earthing jumper" or "equipment grounding conductor (EGC)."Definition and Purpose

The grounding strip, or earthing jumper, is a conductor that provides a low-resistance path for stray electrical currents from the cable tray to the ground, ensuring safety and preventing electric shock or equipment damage . It effectively bonds the cable tray sections together and connects them to the main grounding system, allowing fault currents to safely return to the power source .

Materials and Construction

Earthing jumpers are typically made of tin-plated flexible copper and may be insulated with PVC or other protective coatings to resist corrosion and environmental damage . They are available in various cross-sectional areas, commonly ranging from 4 sq. mm to 35 sq. mm, and can carry currents up to 500A depending on the system requirements . The jumper often includes compression lugs for secure attachment to the tray and grounding points.

Installation Practices
  • Bonding: The earthing jumper is installed between cable tray sections or from the tray to equipment cabinets to maintain electrical continuity .
  • Connection: Bolts or clamps secure the jumper to the tray and grounding points, ensuring a reliable mechanical and electrical connection .
  • Insulation Considerations: In aluminum trays, insulated conductors are preferred to prevent electrolytic corrosion, with insulation removed only at bonding points .
  • Compliance: Installation must follow local and international electrical standards, such as NEC Article 250, to ensure proper grounding and safety .
Alternative Grounding Methods

In some installations, the metallic cable tray itself can serve as the EGC if it meets specific criteria, but using a dedicated earthing jumper is often preferred for reliability and safety . Additionally, individual cables within the tray may include their own EGCs, which can be tapped into the tray grounding system. In summary, the earthing jumper or EGC is the standard grounding strip used in cable tray systems, providing a safe path for fault currents and ensuring electrical continuity across the tray network .

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This reference is intended for preliminary specialty-cable research. Compatibility, link budgets, fire performance, installation methods, test limits and applicable standards must be verified for the specific project.

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