White Paper Explains Strobe Coverage Beyond NFPA 72
The white paper states that a notification system may have gaps in coverage if installed to the specifications of NFPA 72, which allows notification with either direct or indirect viewing of light from visible signaling appliances. However, the testing that led to this requirement was done in areas with lighting levels far below those used in retail occupancies. This means that the signal-to-noise ratio (the illumination from the strobe compared with the illumination of the space without the strobe) in retail is much lower, thereby reducing the effect of indirect signaling. Because of this, some Authorities Having Jurisdiction require strobe coverage in excess of the prescriptive tables outlined in NFPA 72.
For more information on the white paper, visit www.systemsensor.com/pdf/VisibleSignalingWP.pdf or contact System Sensor at (800) 736-7672.