To help you choose the right conductor cross-section depending on the current rating, we have prepared a table with guideline figures for you. These ratings are nominal values based on 35 deg C room temperature and max conductor temperature of 70 deg C assuming standard air flow ventilation.
For more specific information please consult our highly qualified engineers who have many years of experience in the design of electrical equipment and are able to provide technical advise on your application including temperature rise calculations, voltage drop calculations and vibration withstand capability.
How are Current Ratings Calculated?
Current ratings for copper braid are based on how much heat the conductor generates when current flows. Copper dissipates heat well by radiation, convection, and conduction, so the temperature rise stays within safe limits. For example, a 4 mm² copper braid carrying 40 A will typically rise less than 35 °C in most applications.