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The distribution box was not properly grounded

A distribution box that is not reliably grounded poses serious safety risks, including electric shock, equipment damage, and fire hazards, and must be corrected by proper grounding according to standards.

Risks of Poor Grounding

Poor grounding in a distribution box can lead to electrical leakage, short circuits, and potential electric shock for anyone interacting with the system. Ungrounded metal parts, such as the cabinet body or door, can become live if a fault occurs, creating a direct path to earth through a person, which is extremely dangerous . Additionally, insufficient grounding can compromise the operation of sensitive equipment and increase the risk of electrical fires .

Proper Grounding Requirements
  1. Ground Resistance: The resistance between all grounded parts should be less than 0.1 Ohm for reliable safety. This ensures that fault currents are safely dissipated . Some standards allow up to 25 Ohms for certain installations, but lower resistance is always safer .

  2. Grounding Connections:

    • The metal box should be connected to the grounding bus (PE bus) using a dedicated grounding bolt and copper wire or braided conductor .
    • All metallic components inside the box that require grounding must also be connected to the PE bus .
    • Metal doors must be bonded to the cabinet body with a dedicated grounding wire to prevent static discharge or accidental shock .
    • Conduits connected to the box should be electrically bonded to the box, either by welding or proper mechanical connection .
  3. Wire Sizing and Parallel Paths: Ground wires should be sized appropriately (e.g., 16 mm² or 6 AWG in the US) to maintain low resistance. In systems with multiple spindles or long tool cables, parallel grounding paths may be used to reduce total resistance to safe levels .

Maintenance and Verification
  • Regular Inspection: Check all grounding connections for corrosion, looseness, or damage.
  • Testing: Measure ground resistance periodically to ensure it remains below the required threshold .
  • Material Quality: Use high-quality copper or copper-bonded steel for grounding rods and conductors to prevent premature failure .
Summary

A distribution box must be reliably grounded to protect personnel and equipment. This involves connecting the metal enclosure, doors, internal components, and conduits to a properly sized grounding system, maintaining low resistance, and performing regular inspections. Ignoring grounding requirements can result in serious safety hazards and code violations .

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Technical note

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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