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Data Center Rack Grounding Wire Size

Optical access and telecom site reference Published 04 Sep 2026

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For typical data center racks, a 6 AWG copper conductor is recommended for bonding jumpers, while the main ground ring should use a minimum of 4/0 AWG bare copper wire. Equipment Grounding Conductor (EGC) SizingThe grounding wire connecting a server rack to the data center grounding system must provide a low-impedance path for fault currents, ensuring that overcurrent protection devices trip quickly during faults. According to the NEC Table 250.

122, the size of the EGC is determined by the rating of the overcurrent protection device (OCPD) protecting the circuit. For example: For branch circuits up to 60 A, a 10 AWG copper EGC is typically sufficient. For higher-rated circuits, such as 100 A or more, 6 AWG copper is commonly used.

Aluminum conductors require one size larger than copper due to lower conductivity.

EG

Cs should be installed within the same raceway or cable as the circuit conductors to minimize impedance and ensure effective fault clearing.

Bonding Jumpers and Rack Connections

Each rack or cabinet should be individually bonded to the data center's bonding network rather than in series. For typical server racks: Bonding jumpers connecting the rack frame to the bonding grid or Mesh-BN should be 6 AWG copper, with lengths kept under 600 mm to reduce resistance and interference. All interconnections in the bonding grid should be welded or securely fastened to maintain a stable, low-resistance path.

Ground Ring and Main Grounding System

The ground ring, which ties the entire data center infrastructure together, should use a bare copper conductor of at least 4/0 AWG. This ensures a robust grounding system capable of handling large fault currents and maintaining uniform electrical potential across the facility.

Additional Considerations

Ensure all racks, PDUs, and metallic enclosures are properly bonded to prevent electrostatic discharge (ESD) and protect sensitive IT equipment. Verify that the grounding system complies with NEC Article 250 and any local electrical codes. Use copper conductors where possible for superior conductivity and durability, especially in high-density data centers.

By following these guidelines, data center racks will have a safe, code-compliant grounding system that protects personnel and equipment while maintaining reliable operation.

Data Center Rack Grounding Wire Size - CGWEB NETWORK INFRASTRUCTURE [PDF]

Data Center Rack Grounding Wire Size
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