Every common hallway and stairway shall be supplied with a lighting system which produces illumination sufficient to protect the safety of all persons using those facilities. Such lighting systems shall either be kept in continuous operation or shall be controlled by switches which are conveniently located for all persons who might use the stairway or hallway. ('71 Code, § 13-77) (Ord. passed 4-15-80) Penalty, see § 150.999