There should be a wall switch at each floor level to control lighting outlets when interior stairways have how many risers or more?

A wall switch should be installed at each floor level to control lighting outlets when interior stairways have six risers or more. This requirement is established for safety reasons, as it ensures that individuals have easy access to lighting when navigating stairs, which can be a common area for accidents, particularly in low-light situations.

The presence of a switch at both the top and bottom of the stairs allows users to control the lights without needing to navigate the stairs in darkness, which can significantly reduce the risk of trips and falls. By requiring switches for stairways with six risers or more, the electrical code aims to promote safer residential environments, particularly in multi-level homes or apartments.

This consideration is critical for both residential and commercial applications, as ensuring proper illumination in stairways is an essential aspect of building safety and accessibility.