CFR›Title 10›Chapter II›Part 431›Subpart X ContainsSections 431.441–431.442; Subject groups Energy Conservation Standards–Test ProceduresCorpusDaily eCFRDisplayed edition2026-04-15Last updated2026-04-15 Subpart X—Small Electric Motors Contents 431.441 § 431.441 Purpose and scope. 431.442 § 431.442 Definitions. Energy Conservation Standards Energy Conservation Standards Sections 431.446–431.448 Test Procedures Test Procedures Sections 431.443–431.445 Source74 FR 32072, July 7, 2009, unless otherwise noted. Previous W Subpart W—Petitions To Exempt State Regulation From Preemption; Petitions To Withdraw Exemption of State Regulation Next Y Subpart Y—Pumps