20 : 10 : 39 : 49 . Conducting the load box test. Except for dairies with three-phase balanced primary service, each of the following five steps for the load box test is conducted for at least two minutes:

1. (1) The load box is de-energized, the dairy remains on, and the data is recorded;
2. (2) The load box is de-energized, the dairy is shut off, and the data is recorded;
3. (3) The load box is set to half load, the dairy is shut off, and the data is recorded;
4. (4) The load box is set to full load, the dairy is shut off, and the data is recorded; and

5. (5) The load box is set to full load, the dairy is turned on, and the data is recorded.

   For dairies with three-phase balanced primary service, the qualified testing professional only performs steps one and two.

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

General Authority: SDCL 49 - 47 - 2.

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