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. A wire‐to‐wire short or a device activation initiates an alarm event. . Fire alarm systems using a DACT will use telephone line AND: Second line, cell connection, approved radio system. . S. . T taps will not compromise this, where as the old "series circuit" type systems relied on the series wiring and end of line resistors for supervision. Trouble or supervisory alarms do not activate fire horns and strobes and do not require building evacuation. A ground fault is defined as the unwanted grounding of one or more conducting wires. . 175% C. The circuit acts like a conventional alarm receiving circuit. Commonly called a 4-wire circuit, it is actually two wires that begin and end at the control unit. . 4. . The panel supports up to. . _custom Status_custom Valid Date 2019-04-10 Document_ID 315-033744_en Download_No. Fire Alarm Circuit in Open state. Initiating devices are connected to the alarm system’s control panel via 2- or 4-way circuits and are under the control panel’s constant surveillance. The panel supports up to. Class A and B circuit designations still remain for initiating devices, notification appliance, and signaling line circuits, while a number of new circuit designations have been added to address all types of circuits. In the event of an activation of an initiating. 4 meter. Trouble or supervisory alarms do not activate fire horns and strobes and do not require building evacuation. FireAlarm. .