Why do some Fenwal fire detection systems use spot detectors wired in parallel?

Some Fenwal fire detection systems utilize spot detectors wired in parallel primarily to prevent false alarms resulting from a single fault. When spot detectors are wired in parallel, each detector functions independently. This design allows the system to maintain operational integrity even if one of the detectors fails. If a fault were to occur in a single detector, it would not compromise the entire detection network. As a result, the system can continue to accurately monitor for fire conditions based on input from the remaining operational detectors.

This configuration significantly enhances reliability because the system can alert operators to the presence of fire without being affected by the malfunction of an individual sensor. In scenarios where systems are wired in series, the failure of one sensor could lead to the entire system becoming nonfunctional, which increases the risk of undetected fires and unnecessary disruptions.

In contrast, while increasing detection range, reducing maintenance needs, or increasing sensitivity are important considerations in fire detection systems, they are not the primary reasons for using parallel wiring in this context. The main objective in this case is ensuring that the system remains effective and reliable, even amidst faults, thereby preventing false alarms and ensuring safety.