Requirements for bridging connections of distribution box doors
Distribution box doors must be electrically connected to the metal enclosure using yellow-green insulated copper conductors with a minimum cross-sectional area of 4 mm².
Material and Wire Specifications
Bridging connections between the metal door and the distribution box body must use yellow-green insulated copper wires, replacing the previously used braided soft copper wires, which are prone to corrosion and breakage, compromising grounding performance . The cross-sectional area of these wires must be at least 4 mm² to ensure reliable conductivity and grounding . All connecting wires in distribution boxes should be steel-core insulated wires, with insulation color and arrangement following standard specifications .
Installation Requirements
- Connection Method: Wire branch joints must be welded and insulated, avoiding bolted connections, and there should be no exposed live parts .
- Grounding: The metal enclosure and door must be electrically connected to the PE (protective earth) line via PE line terminal blocks .
- Compliance: Installations must adhere to the JGJ46-2024 Technical Standard for Safety of Temporary Power Supply at Construction Sites and the GB 50303-2015 Code for Acceptance of Construction Quality of Building Electrical Engineering .
Safety Considerations
- Ensure mechanical strength and durability of the connection to prevent accidental disconnection or damage .
- Maintain insulation integrity to prevent short circuits or unintended grounding .
- Verify that the bridging connection does not interfere with the operation of the distribution box or create hazards for personnel .
Summary
To meet current standards, use yellow-green insulated copper conductors of at least 4 mm², ensure proper welding and insulation of joints, and connect the door and enclosure to the PE line. Avoid using old braided soft copper wires, as they no longer comply with modern safety regulations . This ensures stable grounding, reliable conductivity, and compliance with updated electrical safety codes.
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