Owners shall ensure that all parts of elevators, including machines, cars, hoistways, hoistway landing opening protective devices and all appurtenances are maintained in a structurally sound, firmly secured, and sufficient condition to perform safely the work for which they were intended and are kept sufficiently clean to prevent fire hazards. No existing elevator may be altered by removing, modifying or rendering inactive any safety feature that was part of the original installation or that was added at a later date, if the alteration diminishes the safety of the elevator below that which existed before the alteration.
02-041 C.M.R. ch. 521, § 6