Direct Current Basic Fire Alarm System Circuit Diagram
Direct Current Basic Fire Alarm System Circuit Diagram -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.
Tags: fire alarm system design, fire alarm system, initiating device circuit, DC fire alarm, fire alarm panel, fire alarm system circuit diagram,