Some of these may be key switches (to control access).

Unless local codes require otherwise, this will most likely be a key switch.

It is activated by a key switch either inside the elevator itself or on a centralized control panel in the lobby.

The man turned the key switch one more time and the elevator froze in position with the doors open.

A Department of Corrections official then turned a key switch in the wall behind the electric chair, activating the system.

Kong's hand shot out to his own key switch.

Class-3B lasers must be equipped with a key switch and a safety interlock.

There was a bulb sticking out of the wall, with a key switch.

The key switch is used to return the escalator to service after it has been stopped.

I got up to my feet and reached up and turned the key switch of a hanging bulb.