IEC 60034-30-1:2014规定了根据IEC 60034-1或IEC 60079-0额定的单速电动机在正弦电压电源下运行的效率等级。本标准建立了一套基于频率、极数和电机功率的极限效率值。电机技术、电源电压或专为变频器运行而设计的绝缘增强电机之间没有区别，尽管这些电机技术可能并不都能够达到更高的效率等级。这使得不同的电机技术在能源效率方面具有完全的可比性。

IEC 60034-30-1:2014 specifies efficiency classes for single-speed electric motors that are rated according to IEC 60034-1 or IEC 60079-0, for operation on a sinusoidal voltage supply. This standard establishes a set of limit efficiency values based on frequency, number of poles and motor power. No distinction is made between motor technologies, supply voltage or motors with increased insulation designed specifically for converter operation even though these motor technologies may not all be capable of reaching the higher efficiency classes. This makes different motor technologies fully comparable with respect to their energy efficiency potential.