Which of the following is NOT a common cause of false alarms in an alarm system?

Stable environmental conditions are indeed not a common cause of false alarms in an alarm system. In fact, a stable environment typically contributes to the reliable performance of alarm systems. When environmental factors such as temperature and humidity are consistent, the likelihood of system components triggering an alarm due to external influences is reduced.

In contrast, dust accumulation can interfere with the sensors used in alarm systems. Accumulated dust on motion detectors or contact points may lead to malfunctions, potentially causing false alarms. Similarly, humidity changes can affect electronic components and sensor sensitivity, leading to erroneous signals. Improper installation can create a range of issues such as misaligned sensors or inadequate wiring, which also predispose the system to false alarms.

Thus, the presence of stable environmental conditions creates an ideal scenario, mitigating the risk of false alarms.