for an additional [30] [15] minutes. Supervise batteries for low voltage
and circuit continuity. Provide calculations substantiating battery
capacity. Provide reliable separation between cells to prevent contact
between terminals of adjacent cells and between battery terminals and other
metal parts.
2.7.7.2
Battery Charger
Provide automatic high and low charging rate type charger, capable of
recovering batteries from full discharge to full charge in 24 hours or
indicate the state of battery charge. Provide red pilot light to indicate
when batteries are manually placed on a high rate of charge as part of the
unit assembly when high-rate switch is provided.
2.8
DETECTOR
2.8.1
Open-Area (Spot-Type) Smoke Detectors
Design for detection of abnormal smoke densities by the [ionization] [or]
[photoelectric] principle. Provide control and power modules required for
operation integral with main control panel. Ensure detectors and
associated modules are compatible with main control panel and suitable for
use in a supervised circuit. [Provide 4-wire detector circuits whereby
detector operating power is transmitted over conductors separate from
initiating circuit.] [
As an alternate, provide 2-wire detector circuits whereby detector
operating power is transmitted over initiating circuits when:
a.
Detectors used are approved by control panel manufacturer for use
with control panel provided.
b.
Detectors are UL listed or FM approved as being compatible with
control panel.]
When 2-wire detectors are provided, total number of detectors on a
detection circuit shall not exceed 80 percent of maximum number of
detectors allowed by control panel manufacturer for that circuit and
standby current draw of entire system shall not exceed 80 percent of the
rated output of the system power supply modules. [Provide additional zones
above those specified in paragraph entitled "Annunciation Zones" when
required to meet the above requirements.] Malfunction of the electrical
circuits to the detector or its control or power units shall result in the
operation of the system trouble signals. Ensure each detector contains a
visible indicator lamp that flashes when the detector is in the normal
standby mode and glows continuously when the detector is activated.
[Provide remote indicator lamp for each detector located above ceilings,
beneath raised floors, or otherwise concealed from view.]
Use plug-in
detectors with tab-lock or twist-lock, quick disconnect head and separate
base in which the detector base contains screw terminals for making wiring
connections. Ensure detector head can be removed from its base without
disconnecting wires. Removal of detector head from its base, shall cause
activation of system trouble signals. Provide a factory installed screen
for each detector to prevent the entrance of insects into the detection
chambers.
2.8.1.1
Ionization Detectors
Use multiple chamber detectors responsive to both visible and invisible
SECTION 13962N
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