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An emergency light is a battery-backed lighting device that switches on automatically when a building experiences a power outage. In the United States, emergency lights are standard in new commercial and high occupancy residential buildings, such as college dormitories, apartments, and hotels.
Early exit signs generally either were made of metal and lit by a nearby incandescent light bulb [4] or were a white glass cover with "EXIT" written in red, placed directly in front of a single-bulb light fixture. A flaw in these designs was that in a fire the power to the light often failed.
As tritium illumination requires no electrical energy, it has found wide use in applications such as emergency exit signs, illumination of wristwatches, and portable yet very reliable sources of low intensity light which won't degrade human night vision. Gun sights for night use and small lights (which need to be more reliable than battery ...
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Emergency exit in Universitetet metro station in Stockholm. An emergency exit in a building or other structure is a special exit used during emergencies such as fires.The combined use of regular and emergency exits allows for faster evacuation, and emergency exits provide alternative means of evacuation if regular exits are inaccessible.
The illumination of the exit markings needs to be confirmed via a visual inspection at intervals not exceeding 30 days. If the occupancy is also required to have emergency lighting, these illuminated exit signs need to be provided with emergency power.
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