@▷ Direct Current Basic Fire Alarm System Circuit Diagram | Diagram for Schematic

Direct Current Basic Fire Alarm System Circuit Diagram

[Alarm] Direct Current Basic Fire Alarm System Circuit Diagram: fire alarm system circuit design

This fire alarm systems circuit diagram using direct current (DC) continuity supervision. The circuit uses fire alarm panel which usually known to be single initiating device circuit (IDC).

As you can see briefly in the diagram (click to enlarge), this basic fire alarm system circuit design consists of control panel (A), initiating device circuit field wiring (B), small supervisory current flowing through EOL resistor (F) (C), alarm initiating device contact (D), voltage sense circuitry (E), Test Point Zone Vz (G), and supply voltage Vs (H).

The small supervisory current flowing through EOL resistor (C), this will keep test point zone voltage at 1/2 supply voltage.

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