To achieve the lowest possible voltage drop or transport loss, we use highly conductive pure copper Cu-ETP or OF-Cu for busbars. With the same cross-sectional area, copper offers the best current strength and thus also current density compared to CoppAl® and aluminum. We look forward to hearing from you! Copper busbars are used, among other things, as electrical connection elements in high-current technology, high-voltage technology. An alternative to multiple, large cables, ERIFLEX copper busbars are used for making strong and reliable power and earth-ground connections with ease. See how simple installation can be in distribution switchgear, marine transportation, machinery manufacturing, busduct and power generation. In this new edition the calculation of current-carrying capacity has been greatly simplified by the provision of exact formulae for some common busbar configurations and graphical methods for others. Other sections have been updated and modified to reflect current practice. Copper Development. A Busbar is a clever bit of kit used to make complex power distribution easier, less expensive, and more flexible. Electrical busbars come in various forms such as solid bars, flat strips, or insulated combs.