Fire Alarm Lesson 7&8 Practice Test

The idea is to distinguish problems in the devices themselves from problems in the cables that connect those devices. A hardware fault means the device itself has failed or is malfunctioning—such as a detector, a relay, or a power supply that isn’t working properly. A wiring fault refers to issues in the conductors and connections that link devices to the control panel, like an open circuit, a short circuit, or a ground fault.

In practice, hardware faults point you toward replacing or repairing the faulty device. Wiring faults point you toward inspecting and repairing the cabling and terminations. For example, if a detector won’t power up even though power is available, that suggests a hardware fault. If the detector is fine but the loop wiring is open or shorted, that’s a wiring fault.

Other options miss the fundamental split: they either swap the definitions, claim they’re the same, or bring in environmental factors or software, which isn’t how these faults are categorized in fire alarm systems.