15-61   Service Specifications
New Three-Phase Commercial Services are supplied at three phase, four wire wye, at 120/208 Volts or 277/480 Volts. Delta services must operate ungrounded, unless prior written approval is obtained by the customer from the City Utilities Department.
Current unbalance between phases should not exceed 15%. (Amended by Ordinance No. 9578, effective 03-29-2016)