NFPA 72 2016 Chapter 18 - Notification Appliances
Audible Characteristics - Specific to Low Frequency
The following information contains the changes, updates and additions to both the audible and visual characteristics found in Chapter 18 of the NFPA 72 2016 edition. Remember if you see a * make sure to consult the Annex A for additional information.
- 18.4.5.3* Audible appliances provided for the sleeping areas to awaken occupants shall produce a low frequency alarm signal that complies with the following:
- (1) The alarm signal shall be a sqaure wave or provide equivalent awaekening ability.
- (2) The waveform shall have a fundamental frequency of 520 Hz + or - 10%.
- (3)* The notification equipment shall be listed for producing the low frequency waveform.
Author note:
Author note:
A square wave is a non-sinusoidal periodic waveform in which the amplitude alternates at a steady frequency between fixed minimum and maximum values, with the same duration at minimum and maximum.
Visual Characteristics
- 18.5.3.2* The maximum light pulse duration shall be 20 milliseconds with a maximum duty cycle of 40 percent.
Exception: Lights used to meet the requirements of 18.5.5.5 shall be permitted to be listed and labeled to have pulse duration up to 100 milliseconds.
- Table 18.5.5.7.2 Effective Intensity Requirements for Sleeping Area Visible Notification Appliances.
Visual Characteristics
- 18.5.3.2* The maximum light pulse duration shall be 20 milliseconds with a maximum duty cycle of 40 percent.
Exception: Lights used to meet the requirements of 18.5.5.5 shall be permitted to be listed and labeled to have pulse duration up to 100 milliseconds.
- Table 18.5.5.7.2 Effective Intensity Requirements for Sleeping Area Visible Notification Appliances.
NFPA 72 2016 Chapter 21 - Emergency Control Function Interface
NFPA 72 2016 Chapter 14 - Inspection, Testing and Maintenance
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