3 AAC 52.460. Quality of service

(a) A utility shall, except in the case of conditions caused by the utility's customers, maintain a steady-state standard frequency of 60 Hertz within the following tolerances:

(1) wherever 2,000 or more customers of one or more utilities are served by an isolated or interconnected transmission or distribution system, frequency must be held within plus or minus two percent of standard frequency; cumulative error registered by an electric clock over a 24-hour period may not exceed 90 seconds; and

(2) for other service areas, frequency must be held within plus or minus two cycles of standard frequency.

(b) A utility shall provide various standard voltages as stated in its tariff, and shall comply with the voltage standard set out in section C84.1-1982 of the American National Standards Institute.

(c) At intervals not to exceed one year a utility shall calculate customer primary voltage to determine the voltage profile of its primary distribution feeders over a 12-hour period during the season of peak demand and including the hours of maximum load. Records supporting the voltage profiles must include the location and parameters of any test and must be available for inspection by the commission for a period of two years after the date of the test.

(d) A utility shall establish planning and preventive maintenance procedures designed to provide a reasonable level of uninterrupted service and, if interruptions occur, to speed the restoration of service.

(e) If planned outages are necessary, a utility shall make a good faith effort to do the work at a time that will cause minimal inconvenience to customers, and to notify customers in advance of the interruption, in conformity with the utility's plan required by 3 AAC 52.490(a) (2).

(f) A utility shall develop and maintain an outage contingency plan, including a public information plan, which is appropriate to the utility's location and size.

(g) A utility shall maintain detailed records of planned and unplanned outages and of interruptions of service. These records must include the cause, whether planned or unplanned, duration, location of the outage, and the approximate number of customers affected. These records must be available to the public. For purposes of this subsection, a momentary fluctuation does not constitute an interruption of service.

History: Eff. 1/1/87, Register 100

Authority: AS 42.05.141

AS 42.05.151

AS 42.05.291

AS 42.05.691

Editor's note: Copies of section C84.1-1982 of the American National Standards Institute, mentioned in 3 AAC 52.460(b) , may be obtained at the offices of the Regulatory Commission of Alaska as specified in 3 AAC 48.010(a) .

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