Temperature Rating: Bus bars should be sized to operate below their maximum temperature rating. Enter your system's parameters (e. Select the busbar Material (Copper or Aluminum). Full IEC Verification Enter your base parameters as in the standard. The busbar sizing calculator determines the required busbar dimensions based on the continuous current rating, short circuit withstand, and thermal limits for switchgear assemblies. The current rating is calculated from the conductor cross-sectional area, material (copper or aluminium), and maximum. Click here for more Electrical Calculators Bus bars are the essential components in the electrical distribution systems (EDB) serving as primary conductors that carry current between 1). Poor quality of electrical devices and materials. Busbar sizing by current and temperature rise is therefore not a formality — it is a safety-critical engineering process governed by IEC 61439-1 and.