2025-05-14 00:00:00 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.