INITIATING DEVICES - HEAT DETECTORS, SMOKE DETECTORS, MANUAL STATIONS
The following are the initiating devices that initiates an alarm, or abnormal signal and Need Electricians uses in installing the fire alarm systems:
A trouble or maintenance condition in the system wiring is also frequently annunciated by zone. Usually, a yellow or amber light indicates trouble and a red light indicates an alarm signal. An annunciator may be incorporated into the fire alarm control unit, in which case it is generally actuated by connection to the control unit. It may also be located at a remote point, in which case it may be actuated either by the control unit or by auxiliary contacts in the initiating devices. Some installations may have a fire alarm control unit with an integral zone annunciator and a remote annunciator provided elsewhere.
Frequently, the control unit standby battery is used to provide power for annunciator operation during power failure. Annunciator visual indicators may be of the drop type or the lamp type. Those of the drop type (which are essentially obsolete) use electromagnetic devices to move a flag into or away from a window to indicate a change in zone condition. Annunciators of the lamp type use pilot light assemblies to indicate an alarm or trouble condition (usually red for alarm, amber for trouble). The more common type of annunciator in use today is the lamp type. The advantages of LEDs are low current, long life, and small size, allowing annunciation of many zones in a small space.
While there is an alarm condition, audible devices should produce loud, clear, consistent tones, and system codes should be clearly recognizable. Visual devices should be bright and steady or pulsating, as intended.The annunciator lamps will be tested by operating a "lamp test" switch if it is provided; otherwise, there will be an alarm and a trouble condition on each zone. It is usually convenient to cause these conditions at the control unit initiating circuit terminals. When a single indicating device fails to operate, it is usually defective. If a group of devices fail to operate, the fault is usually a defective circuit.
WE GUARANTEE A FULLY COMPLETE AND TESTED FIRE ALARM SYSTEM!
An important part of the fire alarm system is the installation of wiring.
Since our trained technicians are also certified electricians, you can't find better combination of expertise for such tasks.
Our technicians will also test the wiring installation which entails the disconnection of one wire from the terminal of each device to ensure that control units show a resultant trouble signal both audible and visual.
INDICATING DEVICES, SPEAKERS , BELLS, AND STROBES
ALARM-INDICATING DEVICES are the lights or sound devices that indicate a fire alarm or abnormal condition. These lights and sounds can also provide information about where the signal originates. Indicating devices are divided into two major categories: visual (annunciators) and audible (bells, horns, chimes, and so forth).
Annunciators give a visual indication of the "zone" or general area where an alarm originated. The annunciator indicator can be operated directly by auxiliary contacts in the initiating device or from a connection to the fire alarm control unit.
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