2010年版NFPA 72® 国家火灾报警和信号代码®引入了在睡眠区域对新的低频公共模式声音报警信号的要求. This new low-frequency signal required a fire alarm notification appliance to produce a square wave with a fundamental frequency of 520 Hz +/- 10 percent or provide some equivalent awakening ability. This requirement was introduced based upon research that demonstrated that a low-frequency signal provides a superior awakening ability for persons with hearing loss and alcohol-impaired adults when compared to the typical 3000+ Hz audible alarm signal of standard fire alarm audible notification appliances. A similar requirement was also introduced in the same edition of NFPA 72® for single- and multiple-station smoke alarms, 然而, 它只适用于为轻度至重度听力损失人士设计的住宅单位.
作为皇家88账户注册个要求的结果, fire alarm manufacturers developed low-frequency tone-based notification and sounders for system detectors as well as low-frequency .用于单向数字语音通信系统的Wav文件. 然而, 因为该要求是在2010年版NFPA72®中引入的, a listed 120VAC smoke alarm that produces a low-frequency alarm has not been developed due to difficulties with the design of the battery backup and due to the fact that only “sleeping rooms and guest rooms for those with hearing loss” were required to comply with the requirement.
最近, the 2021 edition of the International Building Code (IBC) introduced a new requirement for audible alarms activated by single- and multiple-station smoke alarms in sleeping rooms of Group R-1 occupancies (transient occupancies such as hotels and motels) and Group R-2 occupancies (permanently occupied occupancies such as apartments and condominiums) that are required to be equipped with a fire alarm system per Chapter 9 of the IBC to produce a low frequency (520 Hz) alarm signal. The code section further states that where a sleeping room smoke alarm is unable to produce a low-frequency signal, a listed low-frequency notification appliance or a system smoke detector with an integral 520 Hz sounder shall be provided. 根据2021年IBC的专家评论, the reason for this requirement is that more recent studies have concluded that the low-frequency alarm is six times more effective than the standard 3000+ Hz alarm in waking people over 65, 有听力障碍的人, 学龄儿童, 还有酗酒的人.
因为目前没有上市的120VAC烟雾报警器产生低频报警, this poses a challenge to single- and multiple-station smoke alarm installations in buildings constructed in accordance with the IBC. 直到低频烟雾报警器被研制出来, this requirement will necessitate utilizing the building’s fire alarm system under one of the following methods:
带低频测深底座的系统烟雾探测器
代替120VAC烟雾报警器, 系统烟雾探测连接到火灾报警系统与整体低频探测仪可以提供. All of the major fire alarm manufacturers currently offer low-frequency sounder bases that can be equipped with their addressable smoke detection. 在皇家88账户注册种设计下, the sounder bases can be used for notification of a dwelling unit smoke detector and for public mode notification in buildings with tone-based (non-voice) fire alarm systems. This design is typical for hotels/motels and dormitories where the building management or institution maintains the detectors and wants to be aware of detector activation in a given unit.
具有可寻址通知的系统烟雾探测器
另一种解决方案是利用具有可寻址通知的火灾报警系统.e.(在给定电路上驱动单个或选择一组电器的能力). 在皇家88账户注册个选项下, system smoke detectors would be provided without sounder bases and standalone addressable low-frequency tone-based or voice notification appliances would be provided in the unit that would be programmed to actuate either upon a dwelling unit detector or a building fire alarm.
带有专用通知设备电路的系统烟雾探测器
The last option would be to provide system smoke detection without sounders with either dedicated notification appliance circuits for each unit or addressable control modules per dwelling unit off a dedicated dwelling unit notification appliance circuit. 单位内部, 低频基于音调的通知设备或具有低频的基于语音的通知设备 .Wav文件将被提供. The control module per unit would be programmed to actuate either upon a building fire alarm or activation of detection in a given unit.
最后两个选项, standard 120VAC smoke alarms with 3000+ Hz audible signaling could be provided in lieu of system detection and be supervised by the building fire alarm system via addressable monitor modules. The drawback is that activation of a smoke alarm would result in simultaneous activation of the integral high-frequency alarm and the audible notification appliances connected to the building fire alarm system.
以上所有选项都假设有一个可寻址的火灾报警系统. Integration with the building’s fire alarm system results in various drawbacks such as the building Owner being notified anytime a detector activates in a unit. 而探测器的激活可以被视为监控条件，而不是火灾报警条件, 他们仍然会得到通知. 皇家88账户注册也暴露了地板的信号线路电路篡改或麻烦(如.g.租户从他们的基地拆除探测器或试图断开它们的线路).
直到上市120VAC集成低频信号烟雾报警器开发, the new requirement in the 2021 IBC for audible alarms initiated by single- and multiple-station smoke alarms will necessitate the involvement of the building’s fire alarm system. 而皇家88账户注册一要求将导致一种设计，将提供优越的清醒能力的居住者, 它将彻底改变火灾报警系统的设计方式，以适应非短暂占用.
