Section R. 460.3611 - Meter testing equipment; availability; provision and use of primary standardsRule 611.
(1) An electric utility or cooperative shall maintain sufficient laboratories, meter testing shops, secondary standards, instruments, and facilities to determine the accuracy of all types of meters and measuring devices used by the electric utility or cooperative. The electric utility or cooperative may, if necessary and with commission approval, have all or part of the required tests made, or its portable testing equipment checked, by another electric utility or cooperative or agency that uses standards with traceable accuracies to the United States National Institute of Standards and Technology (NIST) or National Research Council (NRC) Canada and that has adequate and sufficient testing equipment to comply with these rules.(2) At a minimum, an electric utility or cooperative shall keep all of the following testing equipment available: (a) One or more portable standard watthour meters that has a capacity and voltage range that is adequate to test all watthour meters used by the electric utility or cooperative.(b) Portable indicating instruments that are necessary to determine the accuracy of all instruments used by the electric utility or cooperative.(c) One or more secondary standards to check each of the various types of portable standard watthour meters used for testing watthour meters. Each secondary standard must consist of an approved portable standard watthour meter that is kept permanently at 1 point and that is not used for fieldwork. Standards must be well-compensated for both classes of temperature errors, practically free from errors due to ordinary voltage variations, and free from erratic registration due to any cause.(d) Suitable standards, which are not used for fieldwork, to check portable instruments used in testing.(3) An electric utility or cooperative shall provide and use primary standards that have accuracies that are traceable to the United States National Institute of Standards and Technology (NIST) or National Research Council (NRC) Canada.Mich. Admin. Code R. 460.3611
1983 AACS; 1995 AACS; 2023 MR 7, Eff. 4/10/2023