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This paper describes a comparative study of induction motor testing standards IEEE 112 and newly published IEC 60034-2-1, primarily used in the US and Europe, respectively. IEC 60034-2-1 has been refined from its earlier version IEC 60034-2 with reference to the IEEE counterpart. Six induction motors are tested following the two standards and the results are compared with regard to their instrumental accuracy and testing procedures. A quantitative method is devised to evaluate the measurement uncertainty which can be interpreted into an efficiency deviation by quadrature addition. This paper is aimed to provide a guideline on interpreting the measured machine efficiency values using these standards and to validate the new IEC standard.