What term describes an alternate power source normally inactive but becomes active whenever the primary power is lost?

What term describes an alternate power source normally inactive but becomes active whenever the primary power is lost?

• A. Auxiliary Power
• B. Emergency Power
• C. Standby Power
• D. Backup Power

Answer: (C)

Standby power is an alternate power source kept in reserve and normally idle, designed to automatically energize and supply the fire pump when the primary power is lost. This automatic start and transfer ensures the pump can begin delivering water without manual intervention during a power outage, which is essential for reliable fire protection. Other terms are broader or imply different activation conditions, whereas standby power specifically means an automatic, inactive-at-rest source that takes over on loss of utility power.

Standby power is an alternate power source kept in reserve and normally idle, designed to automatically energize and supply the fire pump when the primary power is lost. This automatic start and transfer ensures the pump can begin delivering water without manual intervention during a power outage, which is essential for reliable fire protection. Other terms are broader or imply different activation conditions, whereas standby power specifically means an automatic, inactive-at-rest source that takes over on loss of utility power.