I am confused regarding the battery calculation of fire alarm & detection system. Few UL listed panel manufacturers provide a sample calculation in which in alarm condition they recommend to consider only 5% or 20% of the detector to count. Because only the detectors have detected the smoke will lead the LED at ON state which will increase the current consumption of those devices. Rest of the detectors will consume the same current as stand by mode.
Is it approved by NFPA 72? I could find anything else in NFPA 72??
#Battery Calculation #NFPA 72