23 CAR § 463-601. Voltage and frequency standards

(a) Standard nominal voltage. (1) Each electric utility shall adopt standard nominal voltage or voltages as may be required by its distribution system for: (A) Its entire constant voltage service; or (B) Each of the several districts into which the systems may be divided. (2) The nominal voltage to be supplied to a customer shall be specifically stated in the: (A) Customer's service agreement; and (B) Electric utility's tariffs. (3) The voltage supplied to a customer shall not vary more than plus or minus five percent (5%) from the adopted nominal voltage measured at the meter. (b) Voltage variations. Voltage variations in excess of those specified in subdivision (a)(3) of this section shall not be considered a violation if variations are caused by: (1) The operation of power equipment on a customer's premises; (2) The action of the elements; or (3) Infrequent and unavoidable fluctuations of short duration in station operation. (c) Voltage recording requirement. (1)(A) Each electric utility shall have available one (1) or more portable recording voltmeters for the purpose of evaluating customer service. (B) These instruments shall be of a type and capacity suited to the voltage supplied. (2)(A) Each electric utility shall make continual voltage recordings at each distribution substation in order to verify voltage standards. (B) Each electric utility whose distribution substations do not have permanently installed recording voltmeters shall file a plan to provide facilities to comply with this subdivision (c)(2). (C) The plan shall be filed as a tariff within one (1) year of the Arkansas Public Service Commission's adoption of this part. (d) Standard frequency. (1) Each electric utility supplying alternating current shall adopt a standard frequency. (2) The electric utility shall establish a standard frequency and maintain this frequency to within five percent (5%) below the standard at all times. (3) Infrequent and unavoidable fluctuations of short duration due to system operations shall not be considered a violation of this section.