(a) General. Where Sec. 429.14 through Sec. 429.54 authorize the use of an alternative method for determining a physical or operating characteristic other than the energy consumption or efficiency, such characteristics must be determined either by testing in accordance with the applicable test procedure and applying the specified sampling plan provisions established in those sections or as described in the appropriate product-specific paragraph below. In all cases, the computer-aided design (CAD) models, measurements, and calculations used to determine the rating for the physical or operating characteristic shall be retained as part of the test records underlying the certification of the basic model in accordance with Sec. 429.71.
(b) Testing. [Reserved]
(c) Residential refrigerators, refrigerator-freezers, and freezers. The total refrigerated volume of a basic model of refrigerator, refrigerator-freezer, or freezer may be determined by performing a calculation of the volume based upon computer-aided design (CAD) models of the basic model in lieu of physical measurements of a production unit of the basic model. Any value of total refrigerated volume of a basic model reported to DOE in a certification of compliance in accordance with Sec. 429.14(b)(2) must be calculated using the CAD-derived volume(s) and the applicable provisions in the test procedures in 10 CFR part 430 for measuring volume, and must be within two percent, or 0.5 cubic feet (0.2 cubic feet for compact products), whichever is greater, of the volume of a production unit of the basic model measured in accordance with the applicable test procedure in 10 CFR part 430. [79 FR 22348, Apr. 21, 2014]
Sec. Appendix A to Subpart B of Part 429--Student's t-Distribution
Values for Certification Testing
Figure 1--t-Distribution Values for Certification Testing
[One-Sided]------------------------------------------------------------------------
Confidence Interval
Degrees of freedom (from -----------------------------------------
Appendix A) 90% 95% 97.5% 99%------------------------------------------------------------------------1............................. 3.078 6.314 12.71 31.822............................. 1.886 2.920 4.303 6.9653............................. 1.638 2.353 3.182 4.5414............................. 1.533 2.132 2.776 3.7475............................. 1.476 2.015 2.571 3.3656............................. 1.440 1.943 2.447 3.1437............................. 1.415 1.895 2.365 2.9988............................. 1.397 1.860 2.306 2.8969............................. 1.383 1.833 2.262 2.82110............................ 1.372 1.812 2.228 2.76411............................ 1.363 1.796 2.201 2.71812............................ 1.356 1.782 2.179 2.68113............................ 1.350 1.771 2.160 2.65014............................ 1.345 1.761 2.145 2.62415............................ 1.341 1.753 2.131 2.60216............................ 1.337 1.746 2.120 2.58317............................ 1.333 1.740 2.110 2.56718............................ 1.330 1.734 2.101 2.55219............................ 1.328 1.729 2.093 2.53920............................ 1.325 1.725 2.086 2.528------------------------------------------------------------------------ [76 FR 12451, Mar. 7, 2011; 76 FR 24780, May 2, 2011]