Section R. 460.3702 - Standard nominal service voltage; limits; exceptionsRule 702.
(1) Each electric utility or cooperative shall adopt and submit standard nominal service voltages.(2) With respect to secondary voltages, the following provisions shall apply: (a) For all retail service, the variations of voltage must not be more than 5% above or below the standard nominal voltage as submitted pursuant to subrule (1) of this rule, except as noted in subrule (4) of this rule.(b) Where 3-phase service is provided, the electric utility or cooperative shall exercise reasonable care to ensure that the phase voltages are balanced within practical tolerances.(3) With respect to primary voltages, the following provisions apply: (a) For service rendered principally for industrial or power purposes, the voltage variation must not be more than 5% above or below the standard nominal voltages as submitted pursuant to subrule (1) of this rule, except as noted in subrule (4) of this rule.(b) The limitations in subdivision (a) of this subrule do not apply to special contracts in which the customer specifically agrees to accept service with unregulated voltage.(4) Voltages above or below the limits specified in subrules (2) and (3) of this rule may not be considered a violation if the variations are infrequent fluctuations or occur from adverse weather conditions, service interruptions, causes beyond the control of the electric utility or cooperative, or voltage reductions that are required to reduce system load at times of supply deficiency or loss of supply.Mich. Admin. Code R. 460.3702
1983 AACS; 1996 AACS; 2023 MR 7, Eff. 4/10/2023