In the event of a building fire, elevator safety and communication are governed byASME A17.1 (Safety Code for Elevators and Escalators)and theNFPA 101 (Life Safety Code). These codes require that two-way emergency communication systems between the elevator car and a constantly attended central location (such as a security desk or an off-site monitoring service) be maintained for a minimum of60 minutesduring a power failure or fire emergency. While the primary communication systems must have back-up power for a longer duration (often 4 hours for voice), the specific operational survival and signaling requirement for the two-way emergency system and its audible alarm often centers on the 60-minute mark to ensure that passengers trapped during a fire-related shutdown can be located and comforted by rescue personnel.

The 60-minute duration is critical because elevator cars often enter "Phase I Emergency Recall" or "Phase II Emergency In-Car Operation" during a fire. If a car becomes stuck between floors due to a power outage or mechanical failure caused by the fire, the occupants' only link to the outside world is the emergency phone. Providing a minimum of one hour of operational time allows fire departments and building engineers to prioritize their initial life-safety tasks while maintaining contact with anyone potentially trapped in the vertical transport system.

For aCEDPprofessional or a Facility Safety Manager, verifying this 60-minute communication capability is a vital part of theHazard Vulnerability Analysis (HVA)for high-rise structures. If the battery backup for the elevator's internal communication panel fails before this time, it creates a "communication blackout," significantly increasing the risk of panic and complicating the rescue mission. This standard ensures that even if the building's main power grid is compromised by the fire, the "lifeline" to the elevator remains intact long enough for theIncident Commandto execute a coordinated extraction.