{"entityMap":{},"blocks":[{"key":"ccm3v","text":"The purpose of an evacuation alarm system is to warn the individuals in a particular room\/area about a fire or dangerous situation. It tells all persons present to leave the building. ","type":"unstyled","depth":0,"inlineStyleRanges":[],"entityRanges":[],"data":{}},{"key":"9kog5","text":"","type":"unstyled","depth":0,"inlineStyleRanges":[],"entityRanges":[],"data":{}},{"key":"3lm7n","text":"This can be done in several ways:","type":"unstyled","depth":0,"inlineStyleRanges":[],"entityRanges":[],"data":{}},{"key":"54lp2","text":"Loud alarm: with a tone signal (so-called \"slow-whoop\")","type":"unordered-list-item","depth":0,"inlineStyleRanges":[],"entityRanges":[],"data":{}},{"key":"fmffq","text":"Silent alarm: often used to avoid panic; an alarm is given by a tone signal via pagers, a DECT system or a communication system.","type":"unordered-list-item","depth":0,"inlineStyleRanges":[],"entityRanges":[],"data":{}},{"key":"as6jp","text":"Spoken word alarm: a pre-programmed voice gives instructions, possibly in multiple languages. These phrases are interspersed with a tone signal. A spoken word alarm is used in complex situations, such as airports, large shopping centres or other large buildings where there are many different rooms and people.","type":"unordered-list-item","depth":0,"inlineStyleRanges":[],"entityRanges":[],"data":{}},{"key":"66rl","text":"","type":"unstyled","depth":0,"inlineStyleRanges":[],"entityRanges":[],"data":{}},{"key":"eph2d","text":"The system","type":"unstyled","depth":0,"inlineStyleRanges":[{"offset":0,"length":10,"style":"BOLD"}],"entityRanges":[],"data":{}},{"key":"cns10","text":"Commonly, the wiring of evacuation system must be installed in function preservation in order to ensure continued operation for a particular length of time during a fire, usually 30 minutes. This can be achieved by special cables and fitting or by ring loop systems with two-way operation in the event of a break or short circuit.","type":"unstyled","depth":0,"inlineStyleRanges":[],"entityRanges":[],"data":{}}]}
