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See Chinese contents: GB 25958-2010 GB 25958-2010: Minimum allowable values of energy efficiency and values of efficiency grade for small-power motors
This Standard specifies energy efficiency grade, minimum allowable values of energy efficiency, target minimum allowable values of energy efficiency, evaluating values of energy conservation, and test method for small-power asynchronous motors. This Standard is applicable to general purpose motors - small-power 3-phase asynchronous motor (10 W to 2200 W) powered by 50 Hz 690 VAC and below voltage; capacitor running asynchronous motor (10 W to 2200 W); capacitor starting asynchronous motor (120 W to 3700 W), double-value capacitor asynchronous motor (250 W to 3000 W); and motor (6 W to 550 W) for air conditioning fan in room etc.
