1. (a) Scope. Pursuant to section 346(b)(1) of EPCA, this section provides the test procedures for measuring the full-load efficiency of small electric motors pursuant to EPCA. (42 U.S.C. 6317(b)(1)) For purposes of this part 431 and EPCA, the test procedures for measuring the efficiency of small electric motors shall be the test procedures specified in paragraph (b) of this section.

2. (b) Testing and Calculations. Determine the full-load efficiency of a small electric motor using one of the test methods listed in this paragraphs (b)(1) through (4) of this section.

   1. (1) Incorporation by reference: In § 431.443, DOE incorporated by reference the entire standard for CSA C747-09, CSA C390-10, IEC 60034-1:2010, IEC 60034-2-1:2014, IEC 60051-1:2016, IEEE 112-2017, and IEEE 114-2010 into this section; however, only enumerated provisions of those documents referenced in this section are applicable as follows:

      1. (i) CSA C747-09:

         1. (A) Section 1.6 “Scope” as specified in paragraphs (b)(2)(ii) and (b)(3)(ii) of this section;
         2. (B) Section 3 “Definitions” as specified in paragraphs (b)(2)(ii) and (b)(3)(ii) of this section;
         3. (C) Section 5 “General test requirements” as specified in paragraphs (b)(2)(ii) and (b)(3)(ii) of this section; and
         4. (D) Section 6 “Test method” as specified in paragraphs (b)(2)(ii) and (b)(3)(ii) of this section.

      2. (ii) CSA C390-10:

         1. (A) Section 1.3, “Scope” as specified in paragraph (b)(4)(ii) of this section;
         2. (B) Section 3.1, “Definitions” as specified in paragraph (b)(4)(ii) of this section;
         3. (C) Section 5, “General test requirements—Measurements” as specified in paragraph (b)(4)(ii) of this section;
         4. (D) Section 7, “Test method” as specified in paragraph (b)(4)(ii) of this section;
         5. (E) Table 1, “Resistance measurement time delay” as specified in paragraph (b)(4)(ii) of this section;
         6. (F) Annex B, “Linear regression analysis” as specified in paragraph (b)(4)(ii) of this section; and
         7. (G) Annex C, “Procedure for correction of dynamometer torque readings” as specified in paragraph (b)(4)(ii) of this section.

      3. (iii) IEC 60034-1:2010:

         1. (A) Section 7.2 as specified in paragraphs (b)(2)(iii), (b)(3)(iii), and (b)(4)(iii) of this section;
         2. (B) Section 8.6.2.3.3 as specified in paragraphs (b)(2)(iii), (b)(3)(iii), and (b)(4)(iii) of this section; and
         3. (C) Table 5 as specified in paragraphs (b)(2)(iii), (b)(3)(iii), and (b)(4)(iii) of this section.

      4. (iv) IEC 60034-2-1:2014:

         1. (A) Method 2-1-1A as specified in paragraphs (b)(2)(iii) and (b)(3)(iii) of this section;
         2. (B) Method 2-1-1B as specified in paragraph (b)(4)(iii) of this section;
         3. (C) Section 3 “Terms and definitions” as specified in paragraphs (b)(2)(iii), (b)(3)(iii), and (b)(4)(iii) of this section;
         4. (D) Section 4 “Symbols and abbreviations” as specified in paragraphs (b)(2)(iii), (b)(3)(iii), (b)(4)(iii) of this section;
         5. (E) Section 5 “Basic requirements” as specified in paragraphs (b)(2)(iii), (b)(3)(iii), and (b)(4)(iii) of this section;
         6. (F) Section 6.1.2 “Method 2-1-1A—Direct measurement of input and output” (except Section 6.1.2.2, “Test Procedure”) as specified in paragraphs (b)(2)(iii) and (b)(3)(iii) of this section;
         7. (G) Section 6.1.3 “Method 2-1-1B—Summations of losses, additional load losses according to the method of residual losses” as specified in paragraph (b)(4)(iii) of this section; and
         8. (H) Annex D, “Test report template for 2-1-1B” as specified in paragraph (b)(4)(iii) of this section.

      5. (v) IEC 60051-1:2016:

         1. (A) Section 5.2 as specified in paragraphs (b)(2)(iii), (b)(3)(iii) and (b)(4)(iii), of this section; and
         2. (B) [Reserved]

      6. (vi) IEEE 112-2017:

         1. (A) Test Method A as specified in paragraph (b)(3)(i) of this section;
         2. (B) Test Method B as specified in paragraph (b)(4)(i) of this section;
         3. (C) Section 3, “General” as specified in paragraphs (b)(3)(i) and (b)(4)(i) of this section;
         4. (D) Section 4, “Measurements” as specified in paragraphs (b)(3)(i) and (b)(4)(i) of this section;
         5. (E) Section 5, “Machine losses and tests for losses” as specified in paragraphs (b)(3)(i) and (b)(4)(i) of this section;
         6. (F) Section 6.1, “General” as specified in paragraphs (b)(3)(i) and (b)(4)(i) of this section;
         7. (G) Section 6.3, “Efficiency test method A—Input-output” as specified in paragraph (b)(3)(i) of this section;
         8. (H) Section 6.4, “Efficiency test method B—Input-output” as specified in paragraph (b)(4)(i) of this section;
         9. (I) Section 9.2, “Form A—Method A” as specified in paragraph (b)(3)(i) of this section;
         10. (J) Section 9.3, “Form A2—Method A calculations” as specified in paragraph (b)(3)(i) of this section;
         11. (K) Section 9.4, “Form B—Method B” as specified in paragraph (b)(4)(i) of this section; and
         12. (L) Section 9.5, “Form B2—Method B calculations” as specified in paragraph (b)(4)(i) of this section.

      7. (vii) IEEE 114-2010:

         1. (A) Section 3.2, “Test with load” as specified in paragraph (b)(2)(i) of this section;
         2. (B) Section 4, “Testing Facilities as specified in paragraph (b)(2)(i) of this section;
         3. (C) Section 5, “Measurements” as specified in paragraph (b)(2)(i) of this section;
         4. (D) Section 6, “General” as specified in paragraph (b)(2)(i) of this section;
         5. (E) Section 7, “Type of loss” as specified in paragraph (b)(2)(i) of this section;
         6. (F) Section 8, “Efficiency and Power Factor” as specified in paragraph (b)(2)(i) of this section;
         7. (G) Section 10 “Temperature Tests” as specified in paragraph (b)(2)(i) of this section;
         8. (H) Annex A, Section A.3 “Determination of Motor Efficiency” as specified in paragraph (b)(2)(i) of this section; and
         9. (I) Annex A, Section A.4 “Explanatory notes for form 3, test data” as specified in paragraph (b)(2)(i) of this section.
      8. (viii) In cases where there is a conflict, the language of this appendix takes precedence over those documents. Any subsequent amendment to a referenced document by the standard-setting organization will not affect the test procedure in this appendix, unless and until the test procedure is amended by DOE.

   2. (2) Single-phase small electric motors. For single-phase small electric motors, use one of the following methods:

      1. (i) IEEE 114-2010, Section 3.2, “Test with load”, Section 4, “Testing Facilities, Section 5, “Measurements”, Section 6, “General”, Section 7, “Type of loss”, Section 8, “Efficiency and Power Factor”; Section 10 “Temperature Tests”, Annex A, Section A.3 “Determination of Motor Efficiency”, Annex A, Section A.4 “Explanatory notes for form 3, test data”;
      2. (ii) CSA C747-09, Section 1.6 “Scope”, Section 3 “Definitions”, Section 5, “General test requirements”, and Section 6 “Test method”;

      3. (iii) IEC 60034-2-1:2014 Method 2-1-1A, Section 3 “Terms and definitions”, Section 4 “Symbols and abbreviations”, Section 5 “Basic requirements”, and Section 6.1.2 “Method 2-1-1A—Direct measurement of input and output” (except Section 6.1.2.2, “Test Procedure”). The supply voltage shall be in accordance with section 7.2 of IEC 60034-1:2010 (incorporated by reference, see § 431.443). The measured resistance at the end of the thermal test shall be determined in a similar way to the extrapolation procedure described in section 8.6.2.3.3 of IEC 60034-1:2010, using the shortest possible time instead of the time interval specified in Table 5 therein, and extrapolating to zero. The measuring instruments for electrical quantities shall have the equivalent of an accuracy class of 0,2 in case of a direct test and 0,5 in case of an indirect test in accordance with section 5.2 of IEC 60051-1:2016 (incorporated by reference, see § 431.443).

         1. (A) Additional IEC 60034-2-1:2014 Method 2-1-1A Torque Measurement Instructions.

            If using IEC 60034-2-1:2014 Method 2-1-1A to measure motor performance, follow the instructions in paragraph (b)(2)(iii)(B) of this section, instead of section 6.1.2.2 of IEC 60034-2-1:2014;

         2. (B) Couple the machine under test to a load machine. Measure torque using an in-line, shaft-coupled, rotating torque transducer or stationary, stator reaction torque transducer. Operate the machine under test at the rated load until thermal equilibrium is achieved (rate of change 1 K or less per half hour). Record U, I, Pel, n, T, θc.

   3. (3) Polyphase small electric motors of less than or equal to 1 horsepower (0.75 kW). For polyphase small electric motors with 1 horsepower or less, use one of the following methods:

      1. (i) IEEE 112-2017 Test Method A, Section 3, “General”, Section 4, “Measurements”, Section 5, “Machine losses and tests for losses”, Section 6.1, “General”, Section 6.3, “Efficiency test method A—Input-output”, Section 9.2, “Form A—Method A”, and Section 9.3, “Form A2—Method A calculations”;
      2. (ii) CSA C747-09, Section 1.6 “Scope”, Section 3 “Definitions”, Section 5, “General test requirements”, and Section 6 “Test method”;

      3. (iii) IEC 60034-2-1:2014 Method 2-1-1A, Section 3 “Terms and definitions”, Section 4 “Symbols and abbreviations”, Section 5 “Basic requirements”, and Section 6.1.2 “Method 2-1-1A—Direct measurement of input and output” (except Section 6.1.2.2, “Test Procedure”). The supply voltage shall be in accordance with section 7.2 of IEC 60034-1:2010. The measured resistance at the end of the thermal test shall be determined in a similar way to the extrapolation procedure described in section 8.6.2.3.3 of IEC 60034-1:2010 using the shortest possible time instead of the time interval specified in Table 5 therein, and extrapolating to zero. The measuring instruments for electrical quantities shall have the equivalent of an accuracy class of 0,2 in case of a direct test and 0,5 in case of an indirect test in accordance with section 5.2 of IEC 60051-1:2016.

         1. (A) Additional IEC 60034-2-1:2014 Method 2-1-1A Torque Measurement Instructions.

            If using IEC 60034-2-1:2014 Method 2-1-1A to measure motor performance, follow the instructions in paragraph (b)(3)(iii)(B) of this section, instead of section 6.1.2.2 of IEC 60034-2-1:2014;

         2. (B) Couple the machine under test to load machine. Measure torque using an in-line shaft-coupled, rotating torque transducer or stationary, stator reaction torque transducer. Operate the machine under test at the rated load until thermal equilibrium is achieved (rate of change 1 K or less per half hour). Record U, I, Pel, n, T, θc.

   4. (4) Polyphase small electric motors of greater than 1 horsepower (0.75 kW). For polyphase small electric motors exceeding 1 horsepower, use one of the following methods:

      1. (i) IEEE 112-2017 Test Method B, Section 3, “General”; Section 4, “Measurements”; Section 5, “Machine losses and tests for losses”, Section 6.1, “General”, Section 6.4, “Efficiency test method B—Input-output with loss segregation”, Section 9.4, “Form B—Method B”, and Section 9.5, “Form B2—Method B calculations”; or
      2. (ii) CSA C390-10, Section 1.3, “Scope”, Section 3.1, “Definitions”, Section 5, “General test requirements—Measurements”, Section 7, “Test method”, Table 1, “Resistance measurement time delay, Annex B, “Linear regression analysis”, and Annex C, “Procedure for correction of dynamometer torque readings”; or
      3. (iii) IEC 60034-2-1:2014 Method 2-1-1B Section 3 “Terms and definitions”, Section 4 “Symbols and abbreviations”, Section 5 “Basic requirements”, Section 6.1.3 “Method 2-1-1B—Summation of losses, additional load losses according to the method of residual losses.”, and Annex D, “Test report template for 2-1-1B. The supply voltage shall be in accordance with section 7.2 of IEC 60034-1:2010. The measured resistance at the end of the thermal test shall be determined in a similar way to the extrapolation procedure described in section 8.6.2.3.3 of IEC 60034-1:2010 using the shortest possible time instead of the time interval specified in Table 5 therein, and extrapolating to zero. The measuring instruments for electrical quantities shall have the equivalent of an accuracy class of 0,2 in case of a direct test and 0,5 in case of an indirect test in accordance with section 5.2 of IEC 60051-1:2016.

[86 FR 23, Jan. 4, 2021]