For which type of occupancy does NEC require emergency circuits?

The National Electrical Code (NEC) specifies emergency circuits to ensure that critical systems remain operational during power outages, particularly in environments where the safety and well-being of individuals are at stake. The requirement for emergency circuits is particularly applicable in health care facilities, assembly occupancies, and large commercial buildings because these settings often have a high number of occupants or vulnerable populations who may require ongoing care or safe evacuation in emergencies.

Health care facilities need to ensure that critical medical equipment and lighting are maintained in the event of a power failure; assembly occupancies, such as theaters and auditoriums, require emergency lighting to safely guide crowds out of the building; and large commercial buildings need systems in place to prevent accidents and ensure employee safety. These environments have specific needs for emergency systems to comply with safety regulations, reflecting a higher standard of care and accessibility in emergency situations.

In contrast, other types of occupancy, such as single-family homes or industrial settings, may not have the same level of requirement for emergency circuits under the NEC. Therefore, the distinction made in the correct response highlights the NEC's focus on public safety and strong emergency preparedness measures in specific types of occupancy.