(a) Each utility shall develop a meter testing program for the calibration, recertification, care and maintenance of meters, recording devices, field testing equipment and meter calibration equipment (hereinafter referred to in this section as "equipment") in order to keep the equipment in proper working condition. The utility shall have access to a meter laboratory, standard meters, instruments, meter calibration equipment and facilities necessary to carry out its meter testing program. The facilities and equipment shall be available at reasonable times for inspection by any authorized representative of the Commission.
(b) Each utility shall submit its meter testing program to the Commission for approval.
(c) At a minimum, the meter testing program shall include: - (i) Identification of all equipment requiring calibration or recertification;
- (ii) Identification of the nationally recognized standards for the proposed testing and calibration, testing intervals and degree of accuracy for all equipment;
- (iii) A plan for proper care and maintenance of equipment;
- (iv) A requirement that equipment used as a reference or transfer standard shall have a higher degree of accuracy than the item being calibrated and the calibration is traceable to NIST;
- (v) A requirement that equipment used as a reference or transfer standard to certify other equipment shall be kept in temperature-stable environments and calibrated annually;
- (vi) A requirement that equipment used as a reference or transfer standard shall only be used for calibration purposes and shall not be used for trouble shooting, corrective maintenance or any other activity that might jeopardize the instrument's calibration accuracy;
- (vii) For natural gas utilities, a requirement that bell provers, transfer provers or sonic nozzles shall be recertified at not more than five-year intervals and after being moved or dimensionally altered. Recertification shall be accomplished by use of standard-cubic foot bottles, by strapping or by optical measurement techniques, the latter being the preferable method;
- (viii) For natural gas utilities, a requirement that calibrating meters equate a cubic foot of gas with the amount of gas that occupies one cubic foot, dry, at 60° F at 14.73 pounds per square inch absolute; and
- (ix) For electric utilities, a requirement that instrument transformers shall have its installation verified and be tested for ratio and burden performance at the same intervals as the associated meter.
(d) All meter calibration equipment shall bear the last calibration date.
(e) Each electric utility furnishing metered electric service shall provide or have available portable indicating electrical testing instruments of suitable range and type for testing and confirming equipment installations are performing properly.
(f) Each water utility furnishing metered water service using portable test meters to determine the accuracy of meters in service shall recalibrate the portable test meters at sufficiently frequent intervals to ensure correct registration at the specified rates of flow.
023-3 Wyo. Code R. § 3-18