Local warning systems are a complex that combines a human resource consisting of those on duty at a potentially dangerous facility, technical means designed to alert about emergencies, communication lines and broadcasting networks.
Their task is:
- Providing information to personnel on site at the time of the accident.
- Urgent notice to company management.
- Bringing information to civil defense services, rescuers.
When setting up local warning systems at the factory, one should strictly ensure that they are interfaced with the automated central warning system of the city, village, etc. in which they are located.
In the event of an emergency, the LSO solves the tasks of loud notification, ensures the transmission of evacuation messages, commands evacuation, and prevents panic.
At other times, SALW may be used to transmitannouncements or background music. In any space that provides for a large crowd of people (a workshop, a stadium, a shopping center, a theater, educational institutions, hotels, railway stations, etc.), a local public address system must be present without fail.
If we consider local warning systems as technical devices, it becomes clear: these are several blocks connected together.
- Control unit. Includes a computer or, in the case of an analog system, a matrix control unit.
- Signal switching unit.
- Sources and sound amplifiers. These can be microphones on the announcement console, howlers, tones, sirens, etc.
- Console, stationary and remote, allowing to provide a place of work for the dispatcher on duty.
- Loudspeakers.
It should be noted that full-fledged local warning systems should include sirens for giving an alarm signal, equipment for voice or voice communication, indicator lights, beacons, or the like. lighting devices.
Audio message system, emitting an alarm signal with a siren or howler, attracts the attention of people, reporting an emergency. Upon hearing this sound, workers should quickly evacuate the area along a predetermined path.
The voice announcement system (or voice) can transmit pre-recorded short information or the speech of the dispatcher on duty. Such information is usually transmitted in the form of short messages. Voice notification is considered the most informative.
The light warning system is designed, firstly, to draw attention to what is happening by flashing signal lights, strobe lights or the like. Secondly, the light warning system includes autonomous signs indicating the location of exits or other escape routes.
The local warning system is calculated taking into account the characteristics of the enterprise, its area, and the number of premises. In addition, it must take into account the architectural features of the building, its plan, the acoustic properties of the material from which the building is built.
That is why the local public address system and all the equipment included in it must meet certain standards.
