Tag Archive for 'low frequency'

Low Frequency Requirements Sound Confusing, But They’re Necessary

The wording of the 520 Hz signal requirement in NFPA 72®: 2010 and 2013 has caused some confusion. In general, low frequency sounders take the place of standard sounders in commercial sleeping spaces. However, there’s far more to know about the newly enacted requirement.A significant change in NFPA 72, The National Fire Alarm Signaling Code, became effective January 1, 2014 – the 520 Hz low frequency audible fire alarm signal is required in all sleeping areas of newly constructed hotel guest rooms and dormitory sleeping rooms. What does this change mean for you? The short answer is: it depends. And confusion regarding the wording in the 2010 and 2013 editions of NFPA 72 is partly to blame for the difficulty in providing a definitive answer.