System shall apply foam solution over the discharge area for a minimum of
[_____] minutes [while simultaneously discharging foam solution through
hose lines for a minimum of [_____] minutes]. Reduction of the discharge
duration based on a discharge rate higher than the specified minimum is not
permitted.
2.3
DETECTION DEVICES
Provide electric heat detectors. All wiring shall be supervised and
installed in protective metal conduit or tubing.
2.3.1
Control Panel
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NOTE: Select either "Class B" or "Class A"
supervision ("Style B" or "Style D" as defined by
NFPA 72). "Class B" supervision which will normally
be used, provides a trouble indication when a
failure occurs in a circuit. "Class A" supervision
provides a trouble indication when a fault occurs in
a circuit and at the same time allows continued
operation of that circuit. "Class A" supervision
should be used for strategically critical
facilities. Select first ("Class B") or second
("Class A") supervisory option accordingly.
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NOTE: Provide a remote trouble bell or buzzer in a
constantly attended area if the control panel is not
so located. Provide a trouble bell at the control
panel if the panel is located in a high noise area.
Coordinate location of remote trouble bell and
remote annunciator panel when both are provided.
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Modular type panel installed in a [flush] [surface] mounted steel cabinet
with hinged door and cylinder lock. Switches and other controls shall not
be accessible without the use of a key. The control panel shall be a neat,
compact, factory-wired assembly containing all parts and equipment required
to provide specified operating and supervisory functions of the system.
Panel cabinet shall be finished on the inside and outside with
factory-applied enamel finish. Provide main annunciator located on the
exterior of the cabinet door or visible through the cabinet door. Provide
audible trouble signal. Provide prominent engraved rigid plastic or metal
identification plates, or silk-screened labels attached to the rear face of
the panel viewing window, for all lamps and switches. System power shall
be 120 volts ac service, transformed through a two winding isolation
transformer and rectified to 24 volts dc for operation of all system
initiating, actuating, signal sounding, trouble signal and fire alarm
tripping circuits. System shall be electrically supervised on all
circuits. [A ground fault condition or a single break in any circuit which
prevents the required operation of the system shall result in the operation
of the system trouble signal.] [A single open or ground fault condition in
any detection (initiating) [or signaling] circuit shall not result in any
loss of system function, but shall cause the actuation of system trouble
signals. A ground fault condition or single break in any other circuit
shall result in the activation of the system trouble signals.] Loss of ac
power, a break in the standby battery power circuits, or abnormal ac power
SECTION 13957N
Page 17
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