This standard is applicable to the erection, alteration, expansion and inspection as well as to the operation of call systems (CS) providing assistance in calling or searching for persons as required; furthermore, additional information can also be transmitted. A typical feature of such systems is a more or less considerable risk the calling person or others may be exposed to if a call cannot be signalled because of some functional faults or if faults are not noticed in time.
DIN VDE 0834-2 VDE 0834-2:2000-04
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