10 CFR § 429.28 - Faucets.

(a) Sampling plan for selection of units for testing.

(1) The requirements of § 429.11 are applicable to faucets; and

(2) For each basic model of faucet, a sample of sufficient size shall be randomly selected and tested to ensure that any represented value of water consumption of a basic model for which consumers favor lower values shall be no less than the higher of the higher of:

(i) The mean of the sample, where:

$\begin{array}{c}\stackrel{—}{x}=\frac{1}{n}\sum _{i=1}^n{x}_i\\ \text{and,}\stackrel{—}{x}\text{is the sample mean; n is the number of samples; and}{x}_i\text{is the}{i}^{\mathrm{th}}\text{sample;}\end{array}$

Or,

(ii) The upper 95 percent confidence limit (UCL) of the true mean divided by 1.05, where:

$\begin{array}{c}UCL=\stackrel{—}{x}+t_{.95}\left(\frac{s}{\sqrt{n}}\right)\\ \mathrm{And}\stackrel{—}{x}\text{is the sample mean; s is the sample standard deviation; n is the number of}\\ \text{samples; and}{t}_{0.95}\text{is the t statistic for a 95\% one-tailed confidence interval with n-1}\\ \text{degrees of freedom (from Appendix A).}\end{array}$

(b) Certification reports.

(1) The requirements of § 429.12 are applicable to faucets; and

(2) Pursuant to § 429.12(b)(13), a certification report shall include the following public product-specific information: For non-metering faucets, the maximum water use in gallons per minute (gpm) rounded to the nearest 0.1 gallon; for metering faucets, the maximum water use in gallons per cycle (gal/cycle) rounded to the nearest 0.01 gallon; and for all faucet types, the flow water pressure in pounds per square inch (psi).

[76 FR 12451, Mar. 7, 2011; 76 FR 24771, May 2, 2011, as amended at 78 FR 62985, Oct. 23, 2013]