R746-310-4. Station Instruments, Voltage and Frequency Restrictions and Station Equipment

  A. Station Instruments -- Utilities shall install the instruments necessary to obtain a record of the load on their systems, showing at least the monthly peak and a monthly record of the output of their plants. Utilities purchasing electrical energy shall install the instruments necessary to furnish information regarding monthly purchases of electrical energy, unless those supplying the energy have already installed instruments from which that information can be obtained.

  Utilities shall maintain records indicating the data obtained by station instruments.

  B. Voltage and Frequency Restrictions --

  1. Unless otherwise directed by the Commission, the requirements contained in the 2011 edition of the American National Standard for Electrical Power Systems and Equipment-Voltage Ratings (60 Hz), ANSI C84.1-2011, incorporated by this reference, shall be the minimum requirements relative to utility voltages.

  2. Utilities shall own or have access to portable indicating voltmeters or other devices necessary to accurately measure, upon complaint or request, the quality of electric service delivered to its customer to verify compliance with the standard established in Subsection R746-310-4(B)(1). Utilities shall make periodic voltage surveys sufficient to indicate the character of the service furnished from each distribution center and to ensure compliance with the voltage requirements of these rules. Utilities having indicating voltmeters shall keep at least one instrument in continuous service.

  3. Utilities supplying alternating current shall maintain their frequencies to within one percent above and below 60 cycles per second during normal operations. Variations in frequency in excess of these limits due to emergencies are not violations of these rules.

  C. Station Equipment --

  1. Utilities shall inspect their poles, towers and other similar structures with reasonable frequency in order to determine the need for replacement, reinforcement or repair.

  D. General Requirements -- Unless otherwise ordered by the Commission, the requirements contained in the National Electrical Safety Code, as defined at R746-310-1(B)(13), constitute the minimum requirements relative to the following:

  1. the installation and maintenance of electrical supply stations;

  2. the installation and maintenance of overhead and underground electrical supply and communication lines;

  3. the installation and maintenance of electric utilization equipment;

  4. rules to be observed in the operation of electrical equipment and lines;

  5. the grounding of electrical circuits.