Emergency power for means of egress systems shall supply power for a duration of not less than how many minutes?

• A. 45
• B. 60
• C. 90
• D. 120

Answer: (C)

Emergency power for means of egress systems is crucial in ensuring safe evacuation during emergencies, such as power failures or fires. The North Carolina Building Code mandates that this power supply must be reliable and adequate to support lighting and other necessary systems that facilitate safe egress from a building.

The requirement that emergency power must last for at least 90 minutes is based on the need to provide sufficient time for occupants to safely exit the building, even in more extreme situations where evacuation may not be immediate. This duration is established as a standard to account for various scenarios, ensuring that buildings are equipped to handle emergencies effectively.

This requirement is also aligned with national safety standards, demonstrating a commitment to maximizing occupant safety. By providing a minimum of 90 minutes of emergency power, the code addresses potential delays in evacuation and ensures that systems remain functional for the necessary amount of time, thereby enhancing overall safety and preparedness.