On Dec. 19, 2013, the US Department of Energy (DoE) issued a Notice of Proposed Rulemaking covering 1-HP to 500-HP, three-phase induction motors. These recommended changes are based on a study conducted in late 2010. The rule was adopted from a petition filed by the National Electrical Manufacturers Association (NEMA) and a coalition of energy advocates to broaden the scope of coverage while retaining the premium efficiency level and making compliance and enforcement easier.
With the new proposed rule, almost all three-phase motors in three-digit NEMA frames and enclosed 56 frames (plus IEC equivalents) will need to meet premium efficiency levels per NEMA MG 1 Table 12-12. This includes NEMA Designs A, B, and C and IEC Designs N and H. Many designs, such as gear motors, partial motors, vertical, TENV, encapsulated, immersible, and others previously not covered, will also need to comply. The DoE also issued a Final Rule for testing motors that cover these configurations.
A Final Rule on these 1-HP to 500-HP motors is expected in May 2014, with a proposed compliance date of Dec. 19, 2015. The coalition proposal requested two years from Final Rule as the compliance date.