Emergency lighting should provide average illumination at floor level for egress components of at least how many foot-candles?

Emergency lighting should provide average illumination at floor level for egress components of at least how many foot-candles?

• A. 0.5
• B. 2
• C. 1
• D. 5

Answer: (C)

Emergency lighting is meant to keep the exit path usable when power is out, so the floor along the egress path must be lit well enough to see obstacles, steps, doors, and signage. The standard sets a practical baseline: the floor-level illumination along the egress components should average at least one foot-candle. This level provides sufficient visibility for safe movement without being unnecessarily bright or glare-inducing. Reading it as an average accounts for variations along long paths or different luminaires, ensuring the entire route remains navigable during an outage. The other options are either below the required baseline or exceed what’s typically required for standard occupancies.

Emergency lighting is meant to keep the exit path usable when power is out, so the floor along the egress path must be lit well enough to see obstacles, steps, doors, and signage. The standard sets a practical baseline: the floor-level illumination along the egress components should average at least one foot-candle. This level provides sufficient visibility for safe movement without being unnecessarily bright or glare-inducing. Reading it as an average accounts for variations along long paths or different luminaires, ensuring the entire route remains navigable during an outage. The other options are either below the required baseline or exceed what’s typically required for standard occupancies.