Prysmian Groups Ampacity Calculator is a quick and easy tool to get conductor ampacities for different temperature ratings. It is designed for contractors, electricians, and other electrical professionals. The ampacity values are taken from table T310.15 (B) (16). The Ampacity Calculator provides the following options: Code Selection for NEC® 2011, 2014, and 2017. Metric or standard conductors Choice of copper and aluminum conductor material Ampacity numbers according to 60°C, 75°C, and 90°C temperature ratings Ambient Temperature Correction Factors for temperatures other than 30°C ambient temperature