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Idaho State University

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Auxiliary Power
  • An alternate source of electric power, serving as backup for the primary power at the station main bus or prescribed sub-bus. Note: An off-line unit provides electrical isolation between the primary power and the critical technical load; an on-line unit does not. Class A power source is a primary power source; i. e. , a source that assures an essentially continuous supply of power. Types of auxiliary power service include: Class B: a standby power plant to cover extended outages (days); Class C: a quick-start (10 to 60 seconds) unit to cover short-term outages (hours); Class D: an uninterruptible (no-break) unit using stored energy to provide continuous power within specified voltage and frequency tolerances. See also power, primary power, station battery.