520 Hz Low Frequency Requirements for Sleeping Rooms

Meet the latest code requirements for sleeping room applications


New eLearning course:  Online Training on NFPA Codes and Solutions

What organizations need to know about the new NFPA 520 Hz sounder requirements

Effective January 1, 2015, the NFPA 720 Standard for the Installation of Carbon Monoxide (CO) Detection and Warning Equipment requires that audible alarms in sleeping rooms shall produce a low frequency T4 pattern for CO detection to improve the effectiveness of waking up individuals.  This requirement is part of the 2012 edition of NFPA 720.  Effective January 1, 2014, the NFPA 72 National Fire Alarm and Signaling Code added requirements in the 2010 and 2013 editions that audible alarms in sleeping rooms shall produce a low frequency temporal pattern (T3).  These codes affect sounders in hotel and motel guest rooms, college and university dormitories, and assisted living facilities.

Eaton offers 2 solutions that meet NFPA’s low frequency tone requirements

Exceder Low Frequency Sounders:  By using the Exceder LED low frequency sounder, organizations can meet both sleeping room codes – NFPA 72 and NFPA 720 with one device.  The low frequency sounder line features two different sound patterns, T3 for fire detection and T4 for CO detection. Eaton offers low frequency sounder strobe models for both low (110) and high (177) candela settings, ideal for retrofits and new construction. The Exceder LED low frequency sounders and sounder strobes can replace a facility’s existing appliances, utilizing the same single pair of wires that are currently installed, offering a simple retrofit to meet new codes for sleeping rooms. 

SAFEPATH In-building Emergency Communications System: When packaged together with SAFEPATH audio boosters and Wheelock speakers, Eaton’s SAFEPATH SP40S, a multi-use system for emergency communications, paging, and voice evacuation, provides a complete solution, approved for sounding 520 Hertz (Hz) low frequency tones in sleeping room accommodations. SAFEPATH® system is now listed to UL 2017 (code 4), UL 864 (code 3) and the low frequency requirements of UL 464 (520 Hz), which enables the latest product offering from Eaton to meet both NFPA low frequency tone requirements for sleeping areas.

For applications requiring verbal communications, Eaton’s SAFEPATH system is designed to provide low-frequency tones, followed by voice instructions with clear, intelligible messages broadcasted from Wheelock’s high-fidelity EH and LSPK/LSPST3 speaker lines and S speakers to help ensure that the complete message will be understood in order to direct people to safety.

Customer Success Story