Electrical Calculations - Version 2.49 Electrical Busbar, Cable and Powerfactor correction calculations. The rating, dissipation and voltage drop of Aluminium and Copper Busbars can be calculated for any rectangular cross section. The rating and voltage drop of PVC cable is given for both metric and US cable sizes. Power factor correction capacitor sizing is calculated to provide the maximum correction that can be statically applied to an induction motor, this can be twice that shown in tables due to the variations in motor characteristics. Units conversion between metric and imperial units is provided for area, length, volume, mass, torque and pressure.