South Dakota Administrative Rules
Title 20 - PUBLIC SAFETY
Article 20:10 - PUBLIC UTILITIES COMMISSION
Chapter 20:10:39 - Stray electrical current and voltage remediation rules
Section 20:10:39:10 - General requirements for stray voltage measuring and recording

(1) The accuracy and resolution of any instrument used to measure or record cow contact voltage or 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 shall 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 is used to measure current between two points. The meters 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 required resolution and accuracy;

(4) Resistance is measured using either a volt ohmmeter or a digital multi-meter. Resolution must be to the level of one 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 fa 11 -of-potential instrument or a clamp-on resistance-to-earth tester.