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Where one or more lighting outlets are installed for interior stairways, there shall be a listed wall-mounted control device at each floor level and landing level that includes an entryway to control the lighting outlets where the stairway between floor levels has six or more risers. Lighting outlets installed to meet this requirement shall not be controlled by the use of listed wall-mounted control devices except where the devices provide the full range of dimming control at each switch location. [210.70(A)(2)]
Exception: In hallways, stairways, and at outdoor egress doors, remote, central, or automatic control of lighting shall be permitted. [210.70(A)(2) Exception]

Related Code Sections

E3903.3.1 Power and Lighting Distribution, Stairway Lighting Outlet Control
Where one or more lighting outlets are installed for interior stairways, there shall be a listed wall-mounted control device at each floor level ...
(2) Wiring and Protection, Additional Locations
control device at each floor level and landing level that includes an entryway to control the lighting outlet(s) where the stairway between floor levels ...