BS 5839-6 Hush Button (XP95/Discovery protocol)
- An award-winning fire alarm solution for flats, apartments, HMOs and more.
- Provides an individual HMO dwelling with its own 2-minute silence facility (to BS 5839-6/12.2b) & 15-minute isolate facility (to BS 5839-6/12.2a).
- Designed to sit on a communal addressable fire panel’s loop and to communicate its status back to the host panel for building management.
- Has its own conventional detector circuit, conventional sounder circuit & loop isolator.
- Fully monitored for open & short circuit faults.
- Mounts on a standard UK 25mm double gang back box.
- Derives its power from the analogue loop.
- Selectable 12.5mA, 20mA or 30mA Alarm current (allows up to 20 hush buttons per loop, dependent on loop drive current)
- Reduces false alarms and the likelihood of unnecessary building evacuations, system vandalism and the possibility of true alarms being ignored.
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|No. of detector zone circuits
|Max. detector circuit length
|Call point resistor value
|Max. devices per detector zone
|No. of conventional sounder circuits
|Max. sounder circuit length
|EOL resistor value
|Max. sounder output current
|Product dimensions (mm)
|Construction & finish
Dimensions & Mounting Information
|144 W x 84 H x 37 D mm. Fits on a standard UK 25mm flush or surface double gang mount back box.
Hush Button Operation
In its normal state:
With no alarm conditions anywhere in the building, power is applied to the Hush Button’s detector circuit, its detector and sounder circuits are continually monitored for faults, and its Supply Present LED is lit. In the event of a local alarm condition (when a fire detector within the flat or apartment has triggered), the Hush Button’s local sounder circuit will activate and any output devices connected to it will sound.
If there is no one in the apartment to intervene during a local alarm condition (i.e. if the ‘Hush’ button is NOT pressed):
The local alarm sounders will sound for a period of two minutes. If the local alarm clears within these two minutes, the Hush Button will return to its normal state. If the local alarm is still present after two minutes, the alarm will be signalled to the host addressable fire panel and a general alarm condition will be annunciated around the building as programmed.
If the ‘Hush’ button is pressed DURING a local alarm condition:
A hushed period of two minutes will commence starting from when the Hush button is pressed. If the local alarm is cleared
within these two minutes, the Hush Button will return to its normal state. If the alarm doesn’t clear, 15 seconds before the hushed period is about to expire, a beeper will sound to inform the occupant that the alarm is about to be signalled to the host fire panel. If the ‘Hush’ button is pressed again during this 15 second period, another two minute hushed period will commence.
If the ‘Hush’ button is pressed when there are no alarms present:
A hushed period of fifteen minutes will commence. During this period, power is cut to the local zone so no alarm signals from
detectors will be detected (however a manual call point with a suitable resistor, less than 400 ohms, will trigger a full alarm if activated). If the ‘Hush’ button is pressed again during this 15 minute period, power is re-applied to the local zone allowing normal signal processing to resume. 15 seconds before the 15 minute hushed period is about to expire, a beeper will sound to inform the occupant that the local zone is about to be re-powered. If the ‘Hush’ button is pressed again during this 15 second period, another 15 minute hushed period will commence.
Manual call points
If a manual call point is connected to the Hush Button’s detector circuit, provided its resistance when operated is less than 400 ohms, its operation will immediately trigger the Hush Button’s sounder circuit and signal a general alarm condition to the host fire panel.
General fire conditions
If, at any time, the host analogue panel enters a general fire condition, it overrides any hushed state at the Hush Button and turns on its local sounders. Pressing the ‘Hush’ button in a general fire alarm condition WILL NOT silence the local alarm sounders and the dwelling should be evacuated as per the designated fire management plan.
Hush Button Overview
C-TEC’s Hush Button was specifically designed to reduce the incidence of false alarms in houses of multiple occupation by providing reliable, fully monitored fire detection, alarm and silencing facilities INSIDE each individual flat or apartment.
It can be looked upon as a miniature loop-powered single zone fire alarm controller that sits and is addressed on an XP95, Discovery or Xplorer analogue loop (see schematic above) with the ability to communicate its status back to the host panel.
Typically one Hush Button is fitted in each dwelling complete with conventional detectors and conventional sounders to provide occupants with a simple means of invoking two types of ‘hushed’ period – see Hush Button Operation section below.
By providing occupants with this level of control over their fire alarm systems, it helps reduce false alarms and prevent unnecessary building evacuations, system vandalism and the likelihood of a true alarm signal being ignored.