GESTIONVAL ODNODN INFRASTRUCTURE Technical Inquiry

Selection and Verification of Tubular Busbars

Tubular busbars should be selected based on material, current rating, mechanical strength, and compliance with relevant standards, with verification through thermal, mechanical, and electrical testing.Material Selection

For new installations, aluminium tubes are typically used due to their lightweight and cost-effectiveness, while copper tubes are preferred for extensions to existing copper busbar systems unless a break in the system allows aluminium use . Material compatibility is critical, especially at copper-to-aluminium connections, to prevent electrochemical corrosion . The choice of material also affects thermal performance, mechanical strength, and electrical conductivity.

Current Rating and Sizing

Busbars must be sized according to the continuous current rating and system requirements. Standard ratings for aluminium tubular busbars are 1250 A or 2000 A . For low-voltage assemblies, the IEC 61439 standard provides guidance on calculating busbar current requirements, including the use of a diversity factor to account for non-simultaneous loads . For copper busbars, rated current calculations should include correction factors for frequent starts, high-altitude operation, and heat dissipation, with a recommended 10–15% safety margin .

Fittings and Mechanical Considerations

All fittings, including joints, clamps, and conductor connections, must be designed to avoid deformation of the tube and ensure reliable current transfer . Fixed fittings require at least two complete clamps for mechanical stability, while sliding fittings use clamps based on current rating . Support insulators and structures must withstand short-circuit forces, wind loading, and other mechanical stresses as specified in BS EN 61936-1 .

Verification and Testing

Verification ensures that busbars meet electrical, thermal, and mechanical performance requirements:

  • Thermal verification: Temperature rise tests simulate actual operating conditions to confirm current-carrying capacity .
  • Mechanical verification: Structural integrity and impact resistance are tested according to IEC 61439 and IEC 60068 standards .
  • Electrical verification: Continuity, insulation resistance, and short-circuit withstand tests ensure safe operation under rated conditions .
Environmental and Insulation Considerations

Busbars must be designed for the intended environment, including UV exposure, salt mist, and temperature extremes for outdoor installations . Insulation materials such as Nomex®, Tedlar®, Mylar®, Kapton®, and epoxy-glass provide electrical isolation and reduce inductance and impedance . Proper insulation selection enhances safety and performance.

Summary

Selecting and verifying tubular busbars involves:

  1. Choosing the appropriate material (aluminium or copper) based on system compatibility.
  2. Calculating current ratings and applying safety margins.
  3. Ensuring mechanical stability with proper fittings and supports.
  4. Conducting thermal, mechanical, and electrical tests in accordance with IEC and national standards.
  5. Considering environmental conditions and selecting suitable insulation materials. Following these steps ensures reliable, safe, and efficient operation of tubular busbar systems in substations and power distribution networks.
Selection and Verification of Tubular Busbars

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Technical note

This reference is intended for preliminary ODN and passive infrastructure research. Topology, split ratio, box or cabinet capacity, closure rating, cable type, test limits and applicable standards must be verified for the specific project.

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