What is the minimum illumination requirement on the tread runs of stairs within a dwelling unit?

The minimum illumination requirement on the tread runs of stairs within a dwelling unit is set at 1 footcandle. This level of lighting is considered adequate to ensure that occupants can safely navigate the stairs without the risk of tripping or falling. The purpose of this standard is to enhance safety and accessibility within residential spaces.

Lighting levels lower than 1 footcandle may not provide sufficient visibility, particularly in areas with changes in elevation like stairs. Therefore, it is crucial to adhere to this minimum requirement to promote the well-being of residents. This standard fosters a safer living environment, as well-lit stairways facilitate better awareness of one's surroundings.