inevitability

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In safety technology, inevitability describes the establishment of hazard alarm systems in such a way that they only give an alarm when an extraordinary event has actually occurred. Inevitability is achieved when the number of false alarms has been reduced to a minimum.

Measures with which inevitability can be achieved in an intruder alarm system (EMA):

  • It is ensured that the rooms that are monitored by the intrusion alarm system can only be entered if the intrusion alarm system has been disarmed beforehand ( VdS guideline). An alarm triggering by forgetting to disarm is excluded.
  • It is ensured that the intrusion alarm system can only be armed if all sensors, actuators and locks are working properly and there are no technical faults.

In the practical implementation of these measures, special technical devices such as block locks or locking elements are used. These mostly work together with electrical components, the switching sequences of which are geared towards avoiding false alarms.

According to the guidelines of VdS Schadenverhütung GmbH, the inevitability is divided into:

  • Structural inevitability: All structural measures to comply with inevitability, e.g. B. padlocks, one-sided lockability of external doors.
  • Electrical inevitability: All electrical measures to maintain the inevitability, e.g. B. locking monitoring of external doors, electrical locking of blocking elements when the BAS is armed, blocking of the switching device designed as a block lock when the BAS is not fully functional.
  • Organizational inevitability: All organizational measures to comply with inevitability, e.g. B. Entry, presence and exit monitoring of people.

The German police also demand in their guidelines, e.g. B. the ÜEA guideline compliance with inevitability. Numerous police investigations and experiences show that this effectively prevents false alarms.

Compliance with inevitability is also required by DIN VDE 0833-3 from level 2 recommended by the police in Germany. Thus in Germany the procedure according to No. 4.2.3 is to be selected for arming and the procedure according to No. 4.3.4 of DIN CLC / TS 50131-12 for disarming. The procedures otherwise described in DIN CLC / TS 50131-12 are not permitted for EMA from grade 2.

See also

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  1. EMA standard DIN VDE 0833-3
  2. EMA standard arming and disarming DIN CLC / TS 50131-12