20 : 10 : 39 : 58 . Determination of any contributions to stray current or voltage for three-phase dairies. The utility contribution to cow contact voltage or cow contact current for dairies with three-phase balanced load service is determined by directly using the results of the load box test results for steps one and two, as specified in § 20:10:39:49.

The cow contact voltage measured during step one of the load box test shall be the total cow contact voltage. The cow contact voltage measured during step two of the load box test is the contribution to cow contact voltage from the utility, or Vccutility. The contribution to cow contact voltage by the dairy is the difference between cow contact voltage and cow contact voltage from the utility. The formula is: Vccdairy = Vcc - Vccutility.

Source: 42 SDR 174 , effective June 21, 2016 .

General Authority: SDCL 49-47-2.

Law Implemented: SDCL 49-47-2 , 49-47-3 .