Final answer:
Standby time for alarm systems on secondary power is defined in technical specifications or standards related to security systems and emergency power, often governed by building codes or industry groups like NFPA or UL.
Step-by-step explanation:
The standby time for the operation of an alarm system on secondary power is typically defined in the technical specifications or standards associated with security systems and emergency power provisions. These specifications are often governed by building codes or may also be included in the standards set by industry groups like the National Fire Protection Association (NFPA) for fire alarms or Underwriters Laboratories (UL) for security equipment. These standards ensure that alarm systems remain operational during power outages, providing essential safety measures for buildings and occupants.