Which of the following does NOT contribute to the reliability of fire detection systems?

The reliability of fire detection systems is influenced by various factors, and limiting the types of detectors used can actually compromise their effectiveness. Utilizing a wide variety of detection technologies—such as heat, smoke, and flame detectors—enhances the system's ability to detect fires under different conditions. By diversifying the types of detectors, a powerplant can address various fire scenarios, improving overall response and reliability.

On the other hand, regular maintenance and inspections are critical in ensuring that detectors are functioning properly and can detect fires as intended. Environmental interferences can impact the performance of detectors, which is why it's vital to account for them in the design and placement of detection systems. Additionally, the installation of redundant systems adds another layer of reliability by ensuring that if one system fails, another can take over to maintain safety. Each of these factors contributes positively to the reliability of fire detection systems, while limiting detector types could reduce their effectiveness by not leveraging the best technologies for specific scenarios.