In supervised systems, what is the maximum number of initiating devices allowed?

In supervised fire alarm systems, the maximum number of initiating devices that can be connected is typically 64. This limit is set to ensure that the system can effectively monitor and manage the signals from each device without overwhelming the circuitry or creating issues with response times.

Having this maximum number allows installers to design systems that can accommodate a significant number of detectors while ensuring reliable performance. Each initiating device, such as smoke detectors or heat detectors, plays a critical role in detecting fire conditions, and being able to connect a substantial quantity ensures that larger areas can be adequately protected.

In contrast, lower numbers like 12 or 18 would not be sufficient for many commercial or larger residential applications, and 42, while closer, does not reflect the standard limits recognized in industry practices. Thus, recognizing 64 as the maximum aligns with the requirements to safeguard premises effectively and according to applicable codes and standards in the field of fire alarm technology.