Requirements for elevator controls and indicators are governed by local accessibility codes. So, if you own an elevator, you then must refer to the accessibility codes in your local jurisdiction.
Floor selection buttons are used to select floors that the elevator will stop at. The highest floor button shall be at 54" above finished floor or lower. Buttons are 3/4" diameter and illuminate on being pressed.
Operation and emergency buttons are offset below the floor selection buttons. These buttons include door open, door close, emergency stop, emergency alarm, intercom or telephone, etc. The lowest of these buttons shall be at 35" above the finished floor or higher.
Key switch sontrols are sometimes located above the floor selection buttons and sometimes below the operation and emergency buttons. These allow different functions to be turned on or off by building operations personnel. Included may be buttons for fire department control, door hold open, elevator on/off, maintenance function on/off, etc.
Any building in most large cities taller than, say, five stories usually has an elevator, and often, new buildings of even three stories have one. If you live in a large city, chances are that you use an elevator every day.
Chances also are that you don’t give much thought to it, and when you look at the inspection report posted inside the elevator cab, you don’t spend much time analyzing it. Yet, elevators are essential to any mid-rise or high-rise building. See how upset people are when their elevator is out of service for even a few hours!
There have been elevator-like hoist devices throughout history, but in 1853, American inventor Elisha Otis invented a freight elevator equipped with a safety device to prevent the elevator from falling in case a cable broke. This increased the use of elevators. Other improvements followed, such as telephone communications between the operator and an “elevator supervisor” and signal-controlled elevators.