The number of layers in modern buildings is getting higher and higher, the floor space is getting bigger and bigger, the internal facilities are getting better and better, the functions are more and more complete, and the equipment and materials used are getting new and new. The internal flow of a building including horizontal traffic and vertical traffic is also growing. These buildings (including the underground part) should be supplied with uninterrupted power, and in fact various disasters are also possible. Such as: fires, explosions and earthquakes and other disasters. In the event of these disasters, the normal power supply often fails or the power must be disconnected, when normal lighting is completely extinguished. In order to protect the safety of personnel and property, and to timely operate and handle the production and work, and effectively stop the spread of disasters or accidents, emergency lighting should be put into operation immediately.
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