Mass. Gen. Laws ch. 143 § 68
The board of elevator regulations shall promulgate amendments to the regulations relating to the construction, installation, alteration and operation of all elevators, and relative to the location, design and construction of shafts or enclosures for elevators, safety devices, gates and other safeguards, protection against the elevator or hoisting machinery, and means to prevent the spread of fire, and also amendments to the regulations designed to make uniform the work of inspectors assigned to the office of public safety and inspections by the commissioner of the division of occupational licensure.
All elevators in multi-story buildings containing dwelling units shall be of sufficient size to allow the transport of a person on a stretcher in a fully supine position, without having to raise, lower or bend such stretcher in any way and said board shall promulgate regulations necessary to carry out the provisions of this paragraph.
Mass. Gen. Laws ch. 143, § 68