Flexible Insulated Busbars

Flexible insulatedbusbars consi st of several layersofuncoated or tinned copper stri ps and are insulated with flexi ble high quality PVC compound.

Technical data of electrical conductor

  • Copper strips(≥99.9%Cu)
  • Surface: uncoated or tinned
  • Resi stivi ty: ≤1.785Ωcm2 /cm
  • Electrical conductivi ty: ≥56Sm/mm2
  • Tensil e strength: ≥200N/mm2
  • Extensibi lity: ≥30%

Technical data of insulation

  • Material : PVC
  • Color: black
  • Thickness: 1.8-2.1mm
  • Shorehardness: A70-80
  • Electrical strength: ≥23kV/mm
  • Oxygen index: 30%
  • Flameretardant; self-extinguishing
  • Elastici ty: ≥180% after 7-day aging-test wi th 135℃
  • Tensil e strength: ≥20MPa

Technical data of flexibleinsulated busbars

  • Operating temperature: -30℃ to +105℃
  • Operating voltage: 750V
  • Voltage wi thstand performance wi th 15min / 50HzAC:
    • between flexibleinsul ated busbar and earth: ≥15kV
    • between two flexi ble insul ated busbars: ≥30kV


Main features of flexible insulated busbars

  • Easy assembly: it could be easily bended and fixed with handsor easy tools.
  • Possibility of reducing sizes of the equipment:
    • Due to favorable thermal radi ation properti es, the flexible insul ated busbars canhandl e
      heavier current loads than solid busbars of the same cross-section.
    • Due to good insulating performance of the PVC, i t could be possible to reduce the di stances
      between di fferent flexible insulated busbars and between the flexible insul ated busbars and
    • The bendi ng-radius could be smaller than that of normal cable or solid copper bars, so that
      the connections could be more simple and short, and visually it could have better effect.
  • Lower temperature riseon the flexi ble insul ated busbars than onnormal copper bars.
  • High flexibility: no problem wi th vi brationsor thermal expansions.

Application of flexible insulated busbars

The flexi bil ity of the bars makes i t possible to install them into di fficul t equipment or small places
very easily. They wil l be particul arly well used as connectors i n switchgears and between transformers, switching devi ces and prefabricated power networks.

Dimensions and ampacity

  • Standard conductor: copper (99.9%), uncoated or tinned.
  • Standard length: 2m(for 1-layer busbar, 25m is possible).
  • Cross-section: up to 1200mmm 2
  • Color of insulation: black.
  • Ampacity: values are only for information because the actual ampacity is related to the application conditions.

Guidance for selecting the correct dimensions

The ampacities are related to the cross-sections and operating ambient temperature,as shown in above table.
Therefore, three factors should be consideredfor deciding the dimensions:

  • Ampacity
  • Allowed temperature-rise on the bars
  • Width of the bars

The temperature-rise(△T) of bars can be calculated wi th following formula:
△T=Tr – Ta

  • Ta: ambient temperature
  • Tr: temperatureof bars wi th rated current(pay attention: for general electri cal apparatus, Tr
    should be ≤105℃).

Example (justfor reference):

If your operating ambient temperature is 40℃, and you need ampacity 510A with bar width <40mm, you could get allowed highest temperature-rise 65K (105℃-40℃=65K), so you coul d decide dimension 32×1×4. With this bar, the highest temperature-rise will be50K with current 520A.