Interior stairways with at least how many risers require wall switches at each floor level?

Interior stairways that have a specific number of risers, typically five or more, need to be equipped with wall switches at each floor level to facilitate safe and convenient lighting. This requirement aims to ensure that users can easily illuminate stairways, which can be hazardous if poorly lit.

The reasoning behind requiring switches at both levels of the stairway is related to safety. As individuals ascend or descend, they should have access to controls that allow them to turn the lights on or off, reducing the risk of accidents. With five or more risers, the stairs are considered a significant vertical change, and providing this lighting control is vital for visibility in these higher-risk areas.

The importance of this requirement is emphasized in various building codes and safety standards, as proper lighting is essential in preventing falls and ensuring safe navigation of stairs. Thus, the number of risers, particularly five, dictates the necessity for wall switches at each level to meet safety regulations and promote the well-being of building occupants.