Every public hall and public stairway in every dwelling containing four or more dwelling units shall be adequately lighted to provide at least two foot candles of illumination on all parts thereof at all times by means of properly located electric light fixtures; provided, that such electrical lighting may be omitted from sunrise to sunset where there are windows or skylights opening directly to the outside and where the total window or skylight area is at least one-tenth of the combined horizontal area of the floor and stairway of each such public hallway and where such windows or skylights provide adequate natural light to all parts of each such public hallway. Every public hall and stairway in dwellings containing two or three dwelling units shall be supplied with convenient light switches controlling an adequate lighting system that will provide at least two foot candles of illumination on all parts thereof which may be turned on when needed, instead of full-time lighting.
(1964 Code, § 12A-18)