Visual appliances are required in an area if the average ambient sound level is greater than a level of what?

Visual appliances are required in an area if the average ambient sound level is greater than a level of what?

• A. 90 dBA
• B. 75 dBA
• C. 105 dBA
• D. 120 dBA

Answer: (C)

When ambient noise is very high, audible fire alarms may not be heard, so visual notification appliances (like strobes) are required to ensure people receive the warning. The standard sets 105 dBA as the threshold: if the average ambient sound level is greater than 105 dBA, visual signaling must be provided. This helps everyone, including those with hearing impairment, notice the alarm in noisy spaces. Levels below 105 dBA don’t trigger the requirement, while any level above 105 dBA does.

When ambient noise is very high, audible fire alarms may not be heard, so visual notification appliances (like strobes) are required to ensure people receive the warning. The standard sets 105 dBA as the threshold: if the average ambient sound level is greater than 105 dBA, visual signaling must be provided. This helps everyone, including those with hearing impairment, notice the alarm in noisy spaces. Levels below 105 dBA don’t trigger the requirement, while any level above 105 dBA does.