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Connection of signalling devices

Signalling devices are: self-powered sirens, indoor sirens, telephone dial-

lers, etc.

Signalling devices can be classified as follows:

Ø Intrinsic security devices activated by power failure on the specific termi-

nal e.g. self-powered sirens.

Ø Positive Alarm line devices activated by positive (12 V) on the terminal

e.g. indoor sirens.

Ø Negative Alarm line devices activated by ground on the specific terminal.

Ø Balanced Alarm line devices are activated by unbalanced impedance

on the specific terminal.

All types of signalling devices can be connected to the voltage free alarm-

relay contacts (terminals 19, 20, 21).

Figure 17 shows the connection of a self-powered siren, and an indoor si-

ren.

Figure 17 Connection of self-powered siren and indoor siren

INSTALLATION 27

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