What is an essential feature of visible notification devices in fire alarm systems?

The essential feature of visible notification devices in fire alarm systems is that they must not exceed a specified candlepower rating. This requirement is critical because it helps ensure that the intensity of the light emitted by the notification devices is appropriate for visibility without causing discomfort or impairment to individuals in the vicinity. The specified candlepower rating is established to balance effectiveness and safety, allowing the notification signals to be seen clearly while preventing potential glare or distraction that could interfere with evacuation or response efforts during an emergency situation.

Maintaining a proper candlepower rating is crucial, particularly in various environmental conditions and for different building types. By adhering to these standards, visible notification devices provide reliable signals that enhance the effectiveness of fire alarm systems in alerting people to evacuate or take appropriate actions during a fire event.