What are functions of an uninterruptible power system (UPS)? Select all that apply. Group of answer choices Allow time for a generator to start when there is a power outage. Provide high quality power in terms of voltage and frequency. Keep critical equipment running in the event of a utility power outage. Allow time to shut down in an orderly fashion. All of the AboveWhat nominal single phase system voltage is used in residential? Group of answer choices 277/480. 120/240. 120/208