annunciation on the drawings. One station visual
indication light should normally be located at each
of the four corner points of the fence enclosure.
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The annunciator system shall consist of the station's audible [and visual]
indicator and an annunciator cabinet. The cabinet shall house an
annunciator drop for each component malfunction indicated plus a system
pushbutton and flasher and shall be located in [the metal-clad switchgear
aisle] [where indicated]. [[_____] spare drops shall be included.]
Electrical devices required shall be rated for the application and shall be
suitable for the low-voltage alternating-current available as shown or
specified. Auxiliary devices shall be provided as necessary for correct
operation.
2.9.4.1
Station Audible and Visual Indication
One station horn [and the indicated number of station red alarm lights]
shall be installed where shown. The station horn shall be weatherproof and
shall be of the resonating type having an audible output of not less than
100 dB at 3.1 m 10 feet. Station lights shall be 25-watt incandescent with
guards and red globes, shall be UL listed as enclosed and gasketed for use
in wet locations, and shall be of a style suitable for the indicated
mounting. A horn silencing relay shall be wired in series with the horn so
that, after an adjustable time delay of 5 to 15 minutes, the horn shall be
silenced. Necessary auxiliary devices provided in conjunction with the
horn shall permit signalling to a remote central point.
2.9.4.2
Operating Modes
The system shall be wired so that when the component being monitored by an
annunciator is operating correctly, the associated annunciator relay
actuates the normal mode, and when the component malfunctions, the
associated annunciator relay actuates the alert mode. During normal mode
no part of the system shall be energized by the associated annunciator
relay. Upon equipment malfunction, the alert mode shall energize the
system flasher which shall turn the associated annunciators lights on and
off, and sound the station horn, including turning on the station exterior
visual indication lights. Depressing the station pushbutton shall turn off
the horn, the station visual indication lights, and the flasher, but shall
leave the associated annunciator lights on. Correction of a malfunction
shall automatically return the alarm system to the normal mode for the
associated annunciator relay. Turning the system pushbutton during a
normal mode shall simulate an alert mode for all annunciator relays so that
correct operation of annunciator lamps, the station exterior visual
indication lights, the system flasher, and the station horn can be checked.
2.9.4.3
Annunciators
Annunciators shall comply with ISA S18.1 and shall be solid-state logic,
modular, hermetically sealed, plug-in relays each with two integral
long-life lamps for backlighting a white translucent nameplate window of
not less than 75 x 75 mm 3 x 3 inches. Nameplates shall have black letters
at least 3 mm 1/8 inch in height and the inscription shall match the
indicated malfunction description.
2.9.4.4
Other Requirements
The annunciator cabinet shall be suitable for the indicated location and
SECTION 16311A
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