Live voice on secondary power must be 24 hours normal rather than 15 minutes of full power.

Live voice on secondary power must be 24 hours normal rather than 15 minutes of full power.

• A. Not specified
• B. True
• C. Depends on device
• D. False

Answer: (B)

The essential idea is that emergency voice systems must stay available during a power outage. When secondary power kicks in, the live voice system needs to run at its normal operating load for a full 24 hours. This ensures that occupants can receive continuous instructions and the system can be relied upon throughout the first critical day of an incident. A shorter duration, like 15 minutes, wouldn’t provide enough protection for an extended outage, so the standard requires 24 hours of standby power for the live voice function.

The essential idea is that emergency voice systems must stay available during a power outage. When secondary power kicks in, the live voice system needs to run at its normal operating load for a full 24 hours. This ensures that occupants can receive continuous instructions and the system can be relied upon throughout the first critical day of an incident. A shorter duration, like 15 minutes, wouldn’t provide enough protection for an extended outage, so the standard requires 24 hours of standby power for the live voice function.