How many foot candles are specified for stairways and landings?

The specification of 20 foot candles for stairways and landings is based on established guidelines and regulations aimed at ensuring proper visibility and safety in these areas. Adequate lighting in stairways and landings is crucial because these spaces are often high-traffic and can pose a risk for accidents if visibility is insufficient.

Having 20 foot candles ensures that individuals can clearly see the steps and surrounding areas, reducing the likelihood of slips, trips, and falls, particularly in conditions where natural light may not be available. This level of illumination provides a balance between energy efficiency and safety, aligning with safety code requirements that prioritize visibility in potentially hazardous areas.

In contrast, options suggesting lower light levels, such as 10, 15, or other lower values, may not provide adequate visibility, thereby increasing safety risks. Therefore, the requirement for 20 foot candles effectively meets the necessary standard for lighting in stairways and landings.