20 : 10 : 39 : 13 . Field check of measuring equipment. Before voltage or current measurement or testing is performed, the instrument sha11 be field-checked by the service provider. A field-check is done by comparing the measurements of the instrument to the measurements of another instrument or against a known source.

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

General Authority: SDCL 49 - 47 - 2.

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