13.15.037 Phase and voltage specifications.
Electric service shall be provided to city residents in accordance with the following phase and voltage specifications:
   A.   Single-phase service.
      1.   Power
 
Voltage
Minimum Load Required
Maximum Load Required
115/230 volts
over 1-15 amp. and 1- 20 amp. branch circuit
400 amp. main switch
230 volts
none
400 amp. main switch
 
      2.   Motors
         a.   Installation consisting of one motor:
 
Voltage
Minimum Load Required
Maximum Load Allowed
115 volts
none
½ hp*
230 volts
none
10 hp
 
   *or larger provided the locked rotor current does not exceed 40 amp
         b.   For a group of motors, the voltage shall be in accordance with the specification for the largest motor in the group.
         c.   Lighting is supplied at 115/230 volts, single phase, except where otherwise specified in rate schedules.
         d.   Single-phase service may be supplied to installations having a proposed main service switch in excess of the switch capacities specified above provided the written approval of the city has been first obtained as to the number and size of motors, switches, circuits, and related facilities. 115/230 volt installations will be supplied from one 115/230 volt connection where the proposed main service switch does not exceed 600 amperes capacity.
   B.   Three-phase service.
      1.   Power and motor service.
 
Voltage
Minimum Connected Load Required
Maximum Demand Allowed
230 volts
3 hp
300 kva
460 volts
25 hp
1,000 kva
 
      2.   Where three-phase service is supplied at 208 volts from a 4-wire wye-connected service of 115/208 volts, the maximum demand allowed is 1,000 kva.
      3.   Service to all loads of 500 kva maximum demand, or over, must be approved by the city as to adequacy of facilities for service.
      4.   Three-phase load must be balanced between phases in accordance with good engineering practice.
   C.   At the option of the city, the above voltage and phase specifications may be modified because of service conditions at the service location.
(Ord 695, 2000; Ord 588, 1991).