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Considering sightlines and possible obstructions to sensor effectiveness is crucial for alarm contractors when determining the placement of security systems. Sensors, such as motion detectors and cameras, rely on clear lines of sight to detect movement or monitor an area effectively. When designing a system, contractors must assess the environment in which the sensors will be installed. This includes identifying potential obstacles, such as furniture, walls, or outdoor structures, that could impede the sensor's ability to capture movement or provide a clear view.

Proper placement avoids blind spots and ensures that the system provides maximum coverage and reliability. For instance, a camera placed behind a large decorative element may not capture crucial activities occurring in its field of view. Additionally, tampering or environmental factors, such as foliage obstructing outdoor sensors, can significantly reduce the effectiveness of an alarm system. By thoughtfully considering sightlines and the potential for obstructions, contractors can enhance the overall efficacy and reliability of the surveillance and alarm system they are installing.