What is meant by the term “emergency lighting” in building codes?

The term “emergency lighting” in building codes specifically refers to illumination provided during a power failure or other emergency situations to ensure the safe egress of occupants from a building. This is crucial for maintaining safety during emergencies when normal lighting may fail or be insufficient due to power outages, smoke, or other hazardous conditions. Emergency lighting systems are designed to activate automatically when the main power supply is interrupted, illuminating exit paths, stairways, and other critical areas to guide people safely to exits.

Effective emergency lighting is essential to minimize panic, help occupants navigate to safety, and comply with applicable codes and standards that govern building safety. This type of lighting must also meet specific performance criteria to ensure adequate visibility and functionality during such critical moments.