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Federal Register / Vol. 86, No. 1 / Monday, January 4, 2021 / Rules and Regulations
further harmonize DOEs test procedures with current industry practice and reduce manufacturer test burden see section III.F.1 for more details.
For small electric motors, DOE is adding a reference to IEC 6003421 in 10 CFR 431.443 Materials incorporated by reference, paragraph c2 and making a more specific set of references to IEC 6003421:2014 Method 211A
in 10 CFR 431.444 Test procedures for the measurement of energy efficiency, paragraphs b2iii and b3iii and in 10 CFR 431.447 Department of Energy recognition of nationally recognized certification programs, paragraphs b4 and c4.
In addition, section 6.1.2.2 of IEC
6003421:2014 Method 211A
specifies that motors under test should be operated at the required load until thermal equilibrium is achieved. As required under DOEs test procedure, the motor must be rated and tested at rated load. For clarity and consistency, in the April 2019 NOPR, DOE proposed to modify these instructions by replacing the term required load with rated load. 84 FR 17004, 17013. DOE
did not receive any stakeholder comments on this proposal and is modifying these instructions by replacing the term required load with rated load.
Furthermore, IEC 6003421:2014
references IEC 600341:2010 and IEC
600511:2016 to specify required test conditions and procedures when applying the test methods for measuring energy efficiency in the following sections: 1 Section 5.4.1 of IEC 60034
21:2014 specifies that the supply voltage shall be in accordance with sections 7.2 and 8.3.1 for thermal tests of IEC 600341:2010; 2 section 5.5.2 of IEC 6003421:2014 specifies that the measuring instruments 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 IEC
60051; 19 and 3 section 5.7.1 of IEC
6003421:2014 states that the measured resistance at the end of the thermal test shall be determined in a similar way to the extrapolation 19 Section 3.8.2 of IEC 600511:2016 defines accuracy class as a class of measuring instruments, all of which are intended to comply with a set of specifications regarding uncertainty.
Furthermore, IEC 60051:2016 specifies that an accuracy class always specifies a limit of uncertainty, whatever other metrological characteristics it specifies. While IEC 600511:2006
does not define a metric for this term, in practice, accuracy classes are used to designate percentage uncertainties. For example, section 5.5.2 of IEC
6003421:2014 states that for an accuracy class of 0.2, the measuring equipment shall reach an overall uncertainty of 0.2% of reading at power factor of 1.0.

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procedure as described in section 8.6.2.3.3 of IEC 600341, using the shortest possible time instead of the time interval specified in Table 5
therein, and extrapolating to zero.
Therefore, in this final rule, DOE is also incorporating by reference IEC 60034
1:2010 and IEC 600511:2016 to specify the test conditions and procedures as referenced in IEC 6003421:2014.
b. Method 211B
Among the multiple testing methods provided in IEC 6003421:2014, Method 211B Summation of losses, additional load losses according to the method of residual loss is the IEC
6003421:2014 standards preferred testing method for three-phase motors.
This method relies on the indirect calculation of motor losses using a combination of measured values e.g., winding resistance and assumptions so that direct measurement of motor torque is not needed. This method is analogous to the methods of the other industry standards, IEEE 1122004 and CSA
C39010, currently incorporated by reference for testing polyphase small electric motors of output power greater than one horsepower and electric motors.
DOE reviewed IEC 6003421:2014, Method 211B, and stakeholder responses to the November 2017 notice of petition, as well as all of the research papers referenced in the NEMA and UL
petitions. The research papers evaluated IEC 6003421:2014, Method 211B
and the IEEE 1122004 Test Method B
and CSA C39010 testing standards with respect to a comparison of the instrumentation accuracy, test method, and calculation approach, in addition to an analysis of any variability of actual test results. DOE also considered a comparison of results from a round robin test program among 11
participants, which concluded that the same motor tested at multiple test facilities showed a maximum deviation of 0.4 percentage points, using the same IEEE 1122004 Test Method B for each test.20 84 FR 1701317014. DOE
noted that the largest difference reported by stakeholders between measured efficiency values using IEC
6003421:2014, Method 211B and IEEE 1122004 Test Method B did not exceed 0.2 percentage points. 84 FR
17004, 17014.
DOE initially concluded that 1 these methods are not identical, but the differences between these standards are 20 Hydro-Quebec Research Institute, NEMA Motor Round Robin, November 2018. Motor Summit 2018
Proceedings. Available at https
www.motorsummit.ch/sites/default/files/2018-11/
MS18_proceedings.pdf.

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within the expected measurement variation of the existing test procedure;
2 all three tests would result in measurements of efficiency that would yield the same results with respect to motor compliance; and 3 given the variable nature of tested efficiency values for electric motors and small electric motors due to manufacturing and material differences, the variation in the calculated efficiency is insignificant and not likely to result in any significant change in overall energy efficiency test results. 84 FR 17004, 17014. Accordingly, in the April 2019
NOPR, DOE proposed to incorporate by reference IEC 6003421:2014 Method 211B as an alternative to the currently incorporated industry testing standards IEEE 1122004 Test Method B and CSA
C39010 and to IEEE 1122017 Test Method B. Id.
In response to the April 2019 NOPR, NEMA reaffirmed its request for the addition of IEC 6003421:2014 Method 211B as an alternative test standard for polyphase small electric motors greater than 1 hp and electric motors.
NEMA, No. 84 at p. 3
Based on the considerations presented in the April 2019 NOPR, DOE affirms its initial conclusions regarding IEC 60034
21:2014 Method 211B. Allowing manufacturers to test according to IEC
6003421:2014 Method 211B further harmonizes DOEs test procedures with current industry practice and reduces manufacturer test burden see section III.F.2 for more details while ensuring that the test procedure reflects the energy efficiency of the relevant motors during a representative average use cycle. Therefore, in this final rule, DOE
is referencing IEC 6003421:2014
Method 211B as a permitted alternative to the current test methods IEEE 1122004 Test Method B which in this final rule will be replaced with IEEE 1122017 Test Method B and CSA
C39010. In addition, as described in section III.B.2.a, DOE is also incorporating by reference IEC 60034
1:2010 and IEC 600511:2016, which specify the test conditions and procedures for IEC 6003421:2014.
Accordingly, reference to IEC 60034
21:2014 Method 211B is being added to the following sections of the CFR:
For small electric motors, IEC 60034
21 is referenced in 10 CFR 431.443
Materials incorporated by reference, paragraph c2. The specific references to IEC 6003421:2014 Method 211B
are in 10 CFR 431.444 Test procedures for the measurement of energy efficiency, paragraph b4iii and 10
CFR 431.447 Department of Energy recognition of nationally recognized
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