What is the minimum requirement for foot candles at floors, landings, and treads of exterior stairways in non-residential occupancies?

The minimum requirement of 1 foot candle at floors, landings, and treads of exterior stairways in non-residential occupancies is established to ensure adequate visibility and safety in these areas. Foot candles refer to the amount of light that a light source provides on a surface, and having a minimum level of illumination is crucial for preventing accidents, especially in areas that can be subject to weather conditions, wear, and potentially hazardous situations.

A level of 1 foot candle allows for sufficient light to see the steps and other potential hazards, thereby reducing the risk of falls and injuries. This standard reflects a balance between safety requirements and practical lighting solutions. Adequate lighting in such spaces is particularly important during hours of low natural light, ensuring that all building occupants can navigate safely.