SECTION 165:35-15-11. Meter testing facilities and equipment

(a)   General. Each utility furnishing metered electric service shall own or arrange for equipment and facilities and follow test procedures necessary for testing its meters to limits of accuracy specified in this Chapter. The equipment facilities and procedures shall be available for inspection by PUD or its authorized representative. A utility may contract for testing of its meters by another utility or by a non-utility concern performing meter testing service.

(b)   Test standards.

(1)   Each utility furnishing metered electric service shall provide for and have available portable indicating electrical testing instruments or watt-hour meters of suitable range and type for testing service watt-hour meters, demand meters, switchboard instruments, recording voltmeters, and other electrical instruments.

(2)   For testing the accuracy of portable watt-hour meters, commonly called "rotating standards", and other portable instruments used for testing service meters, each utility shall provide for and have available as reference or check standards suitable indicating electrical instruments, watt-hour meters, watt meters, or any or all of them, hereinafter called reference standards. Service type of watt-hour meters may be used as a check standard, but if so, such watt-hour meters shall be permanently mounted in a meter testing facility and shall be used for no purpose other than for checking working rotating standards.

(c)   Reference standards. Reference standards shall be submitted at least once each year to the National Bureau of Standards or to a laboratory approved by the Commission for the purpose of test, adjustment, and certification. Utilities maintaining standardizing laboratories will be permitted to make their own test and certifications of reference standards, provided the instruments and methods in use are acceptable to the Commission.

(d)   Portable test standards. All working rotating standards (portable watt-hour meters) shall be compared with the reference standards at least once every three (3) months, and solid-state watt-hour standards every six (6) months, during the time such working standards are being regularly used. Each rotating standard (portable watt-hour meter) shall at all times be accompanied by a calibrating card, giving the date when it was last calibrated and adjusted. Records of calibration shall be kept on file in the office of the utility, for the life of the instrument.

[Source: Amended at 36 Ok Reg 620, eff 7-25-19]