What are NEMA Premium Efficiency Transformers?
NEMA Premium provides 30% fewer losses than the 2006 DOE 10 CFR Part 431 (commonly called TP1) or Canadian C802.2. This covers low voltage distribution transformers and is measured at 35% load.
NEMA Premium is largely obsolete as a term and has been replaced by similar efficiencies in the U.S.A’s DOE 2016 and Canada’s NRCan 2019 energy efficieny regulations. NEMA no longer promotes the NEMA Premium specification or specifications higher than the current DOE 2016 and NRCan 2019 levels.