Electroacoustic systems for emergency alarm

Voice alarm systems and electroacoustic emergency alarm systems

When used in Emergency Acoustic Alarm (ELA) systems, electroacoustic systems (ENS) must meet a range of national and international standards and be certified to DIN 14675, which has been in force since 2003. The examination questions also apply to an expanded extent to the planning, operation and maintenance of voice alarm systems. The Central Association of the Electrical Industry (ZVEI) has also published corresponding quality guidelines.

But what exactly does an ENS do and how does it differ from a voice alarm system, SAA for short?

In short, an ENS is used for targeted acoustic alarming, for example in case of fire. But it is not part of the fire alarm system, but an independent system. In case of danger, the fire alarm system triggers an audible alarm signal, which automatically occurs on preprogrammed loudspeaker lines. To ensure that the system is ready for use around the clock, it works with an emergency power system for a period of at least 30 minutes. That’s about the time it takes to evacuate. Standby time requirements are provided by the local security authorities. In contrast, ELA refers to an electrical loudspeaker or sound system, which essentially serves to pass on information. For example in airports, railway stations or other public buildings

Certification DIN 14675
What additional benefits do electroacoustic emergency alarm systems offer?

In case of danger, a voice alarm system has some advantages over normal signaling. Especially in complex building structures, in which we usually move, an SAA assumes the function of interpersonal communication: it warns quickly and via language unequivocally. A mere acoustic signal is easily perceived as non-binding and only works one-dimensionally. In the worst case scenario, this increases the window of opportunity between alerting and the eviction of the building in the worst case scenario.

Speech alarming combines two important things: a loud, warning sound signal to attract the necessary attention and a content message that clearly guides to action. Say, she communicates exactly what to do or what to refrain from doing. This is especially true in public buildings, stadiums or other meeting places, schools, hotels and department stores. Here an SAA is indispensable.

As a result, the actual system design is subject to a number of other standards: the application standard DIN VDE 0833-4 (Part 4 Voice Alarm) and the corresponding product standards of the EN 54 series for the power supply, the control center and EN 54-24 for passive loudspeakers. The EN 60268-16 annexed to the above VDE standard explains how the speech intelligibility of a SAA is defined. In addition, voice alarm systems are differentiated according to certain security levels.

ENS and SAA are complex systems. In an emergency, lives depend on their reliability.

Concepture helps you to plan and implement the right system for your requirement profile.

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