During an emergency, how long must batteries maintain 87-1/2 percent of their voltage under full load in health care facilities not requiring Type 1 or Type 2 EES?

In healthcare facilities that do not require Type 1 or Type 2 Essential Electrical Systems (EES), the maintenance of battery voltage during an emergency is governed by specific requirements to ensure that critical systems remain operational. The correct duration for batteries to sustain at least 87-1/2 percent of their voltage under full load is 90 minutes.

This requirement is critical because healthcare facilities must have backup power systems that can support essential services during power outages to protect patient safety and maintain vital operations. The 90-minute timeframe is established to allow sufficient time for emergency response and transition to alternate power sources without risking the health and safety of patients.

The duration reflects both regulatory standards and the practical needs of hospitals and similar facilities, ensuring that they have adequate time to respond to emergencies and maintain operational integrity.