ESA Certified Alarm Technician Practice Exam

What is the decibel level for audible devices set by UL Standard 464 measured at 10 feet?

1. 75 dB

2. 80 dB

3. 85 dB

4. 90 dB

The correct answer is: 85 dB

The correct answer reflects the established standard set by Underwriters Laboratories (UL) for audible devices in alarm systems. According to UL Standard 464, the required sound level for audible alarm signals is set to be at least 85 decibels when measured at a distance of 10 feet from the device. This standard ensures that alarms are sufficiently loud to alert individuals in various environments, thereby enhancing safety and response times during emergencies. The rationale behind this specific decibel level is to ensure that alarms can be heard over ambient noise levels, which can vary significantly in different settings. A level of 85 dB is generally acknowledged as a threshold where sounds become prominent enough to capture attention, even in noisy conditions. In contrast, options that suggest lower decibel levels may not meet the critical requirement for safety and awareness in urgent situations. Thus, understanding and adhering to this standard is essential for proper installation and functionality of alarm systems in accordance with established safety protocols.