NFPA 101 - 1976, required smoke alarms to be in every home
NFPA 74 - 1989, required interconnected smoke alarms for new construction [5,6]. If one alarms, they all alarm.
NFPA 72 - 1993, required hardwired smoke alarms in every bedroom or sleeping area [5,6].
NFPA 72 - 1996, required hardwired smoke alarms in new construction to have battery back-up [5].
NFPA 72 - 1996 July 1, required the smoke alarm signal to be 3 beeps, pause and repeat - aka the Temporal 3 Sound and the Audible Emergency Evacuation Signal, ANSI S3.41 [6].
NFPA 72 - 1999, required smoke to be replaced every 10 years.
UL 217 - 1999, required manufactures to print the date in plain English on the back of the smoke alarm.
NFPA 72 - 2007, required existing homes to have interconnected smoke alarms.
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