Yes, the electrical distribution box in a shopping mall must be properly grounded to ensure safety and prevent electrical hazards.

Importance of Grounding

Grounding a distribution box provides a safe path for stray currents, protecting both people and equipment from electric shock, short circuits, and potential fires. In commercial settings like shopping malls, where multiple stores and high electrical loads are present, proper grounding is critical to maintain system stability and safety .

Grounding Standards

• Metal enclosures of distribution boxes must be grounded. This includes the electrical installation board, metal base, and casing of appliances inside the box .
• The protective neutral wire should be reliably connected through the terminal board, and a leakage protector is recommended for additional safety .
• Grounding resistance should ideally be 25 ohms or less, and multiple rods may be required if resistance exceeds this value .
• All connections should use high-quality copper or copper-bonded steel conductors to prevent corrosion and ensure long-term reliability .

Grounding in Mall Electrical Systems

For malls with multiple stores:

• If the mall has a private transformer (separately derived system), the transformer secondary neutral must be grounded and bonded to the transformer enclosure. Downstream, each store's main panel should keep neutral and ground separate, with optional additional ground rods for each store .
• If the transformer is utility-owned, the main panel of each store still receives phase, neutral, and grounding conductors. The neutral is not bonded in the disconnect; instead, the system grounding electrode conductor bonds the enclosure and equipment ground .

Practical Considerations

• Install the distribution box in a dry, well-ventilated area to prevent corrosion and overheating .
• Ensure firm mounting to avoid movement or vibration.
• Use properly sized copper conductors for all connections, and maintain clear labeling for safety and maintenance .
• Verify that all metal parts of the box and connected equipment are electrically continuous and bonded to the grounding system . Proper grounding is not optional—it is a critical safety requirement for all distribution boxes in commercial buildings, including shopping malls, to protect both people and electrical infrastructure.