20 : 10 : 39 : 10 . General requirements for stray voltage measuring and recording. Equipment used for the measurement or testing of stray voltage, stray current, and resistance shall meet the following criteria:
- (1) The accuracy and resolution of any instrument used to measure or record cow contact voltage or cow contact current shall limit the error to five percent or less at one volt or two milliampere;
- (2) Instruments used to measure cow contact voltage must be capable of separating and independently measuring alternating current and direct current voltages. These instruments must have a minimum internal impedance of 10,000 ohms and must be capable of measuring the true-root mean square voltage;
- (3) A clamp-on ammeter, a digital multi-meter with clamp-on device, or an in-line ammeter must be capable of separating and independently measuring alternating current and direct current and capable of measuring the true-root mean square current. A clamp-on ammeter must have the resolution and accuracy required in subdivision (1);
- (4) Resistance is measured using either a volt ohmmeter or a digital multi-meter. Resolution must be to the level of 1 ohm or less when measuring a resistance of less than 1,000 ohms. Accuracy must be within plus or minus 5 ohms for a 500 ohm resistance; and
- (5) Grounding electrode resistance-to-earth measurements are made with a three-point fall-of-potential instrument or a clamp-on resistance-to-earth tester.
Source: 42 SDR 174 , effective June 21, 2016 .
General Authority: SDCL 49 - 47 - 2.
Law Implemented: SDCL 49-47-2 , 49 - 47 - 3 .