Sec.16-11-115. Voltage variations

(a) For service rendered principally for residential or commercial purposes, the voltage variation shall not exceed an upper limit as low as practically possible, not to exceed a maximum of three per cent above or five percent below standard voltage. Voltage excursions above the upper limit shall not exceed one minute. Providing voltage below the lower limit shall be limited in extent, frequency and duration. Corrective action shall be promptly taken whenever deviations result from other than temporary conditions. Temporary conditions, such as automatic switching to supply interrupted feeders, should not exceed 24 hours where practical. American National Standards Institute (ANSI) Standard c84-1 shall be used to determine the lowest temporary voltage excursions permissible.

(b) For service rendered under contracts principally for power purposes the normal variation in voltage shall not exceed ten per cent above or ten per cent below the standard for any period longer than one minute.

(c) Any electric company may furnish service under conditions of greater voltage variations than that prescribed in the foregoing if specifically provided for by contract filed with the authority.

(d) Where the electric company's distribution facilities supplying customers are reasonably adequate to carry the loads normally imposed, the utility may require that the operating characteristics of utilization equipment shall not cause objectionable voltage fluctuations or other adverse effects.

(e) When an electric company is unable to conform a portion of its distribution system to comply with subsection (a) above, said company may petition the authority for an exemption to said subsection, setting forth the reasons why it is unable to comply. For good cause shown, the authority may grant such exemption under such terms and conditions as it deems reasonable.

(f) Electric companies shall commence implementation of section 16-11-115 (a) upon the effective date of these regulations, and shall have completed said implementation throughout their respective systems or requested appropriate exemptions authorized by section 15-11-115 (e) prior to October 1, 1979.

(Effective March 22, 1990)