I. Standards and Requirements

1. National Standards
   • GB 7251.1-2005: "Low-Voltage Complete Switchgear and Control Equipment - Part 1: Type Tests and Part Type Tests for Complete Equipment."
   • GB 7251.2-2006: "Low-Voltage Complete Switchgear and Control Equipment - Part 2: Special Requirements for Bus Duct Systems."
   • GB 4208-1993: "Degrees of Protection Provided by Enclosures (IP Code)."
   • GB 5585.1-1985: "Copper, Aluminum, and Their Alloy Busbars - Part 1: General Provisions."
   • JB/T 9662-1999: "Dense Insulated Bus Duct Systems."
   • IEC 439: International Electrotechnical Commission Standard.

II. Electrical Technical Specifications for Bus Ducts

1. Rated Working Voltage: 1000 VAC
2. Rated Insulation Voltage: 1000 VAC
3. Ambient Temperature: -5°C to 40°C
4. Relative Humidity: Not exceeding 90% (at 20°C)
5. Altitude: 2000 meters
6. Rated Frequency: 50 Hz
7. Insulation Resistance:
   • Phase-to-phase insulation resistance > 500 MΩ

   • Resistance between copper busbars and enclosure > 500 MΩ

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III. Material Requirements and Performance Indicators for Dense Bus Ducts

1. Enclosure Material:

   • The enclosure should be made of cold-rolled galvanized steel with a thickness of no less than 2mm to ensure strength and rigidity.
   • It must have adequate mechanical impact resistance and cannot use ordinary aluminum alloy enclosures.

2. Corrosion Resistance of the Enclosure:

   • The surface of the enclosure should undergo electrostatic powder coating treatment to achieve excellent corrosion resistance.

3. Conductors:

   • Conductors must comply with the GB 5585 national standard for electrical pure copper busbars.
   • Copper purity should be ≥ 99.95% (original purchase certificates must be provided).
   • The surface of the conductors should undergo reliable, environmentally friendly anti-corrosion treatment to extend their service life.

4. Integrity of Conductors:

   • To ensure current-carrying capacity and structural strength, the entire length of the busbar conductor should remain densely intact (including connection units).
   • There should be no intermediate punch holes or end-section shrinkage in design.
   • The busbar format is TPN.

5. Insulation Materials:

   • Insulation materials should be produced by reputable domestic or international manufacturers.
   • They should use B-class or higher insulation (130°C) polyester film for complete wrapping.

   • A third-party test report for the insulation materials must be provided.

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Conclusion

Ensuring compliance with these technical specifications is crucial for the performance and safety of dense insulated bus ducts. Adhering to national standards not only enhances the reliability of electrical systems but also contributes to overall operational efficiency. For more information on electrical components and standards, visit our website or contact us directly.