Efficiency.
401.2.1 Efficiency. NEMA design A & B squirrel-cage, foot-mounted, T-frame induction motors having synchronous speeds of 3600, 1800, 1200, and 900 rpm, expected to operate more than 1000 hours per year shall have a nominal full-load efficiency no less than that shown in Table 401.2.1 or shall be classified as an energy efficient motor in accordance with RS-3 (incorporated by reference, see 434.701). The following are not covered:
(a) Multispeed motors used in systems designed to use more than one speed.
(b) Motors used as a component of the equipment meeting the minimum equipment efficiency requirements of subsection 403, provided that the motor input is included when determining the equipment efficiency.