With the increase in popularity of low-voltage technology, electrical systems are more susceptible to transient damage and malfunction, and system designers need to put more thought into surge protection on the AC power line and data/communications lines, which feed into fire alarm systems, according to the National Burglar and Fire Alarm Association (NBFFA) and other industry analysts. Nearly 30% to 40% of all damaging transients enter a system via the AC circuit, but an even greater number come in by way of 48V phone lines.