IDC stands for ___.

IDC stands for ___.

• A. Initiating device circuit
• B. Impedance direct current
• C. Industrial delta configuration
• D. Individual data cable

Answer: (A)

IDC stands for Initiating Device Circuit—the wiring path that links initiating devices (like pull stations or smoke detectors) to the fire alarm control panel. When an initiating device is activated, it sends a signal over this circuit to trigger the alarm. This circuit is supervised and typically uses a low-voltage DC supply, with end-of-line protection to monitor for opens or shorts. The other phrases aren’t standard terms for this context: they don’t describe a fire alarm signaling path. In many systems, initiating device circuits work alongside notification appliance circuits to deliver the alert.

IDC stands for Initiating Device Circuit—the wiring path that links initiating devices (like pull stations or smoke detectors) to the fire alarm control panel. When an initiating device is activated, it sends a signal over this circuit to trigger the alarm. This circuit is supervised and typically uses a low-voltage DC supply, with end-of-line protection to monitor for opens or shorts. The other phrases aren’t standard terms for this context: they don’t describe a fire alarm signaling path. In many systems, initiating device circuits work alongside notification appliance circuits to deliver the alert.