2.21.6.1
Enclosure
Unit shall consist of a tamper-resistant, clear polycarbonate shield and
frame that fits over the manual actuation station. The unit shall be
hinged of the top and suitably labeled "Lift Here" on the bottom to
indicate means of gaining access to the manual actuation station it
protects. It shall include a spacer as required to accommodate its use
with a surface mounted manual actuation station.
2.21.6.2
Horn
The unit shall include an 85 db at 3 m 10 ft integral horn powered by a 9
VDC alkaline battery. Upon lifting of the cover, the horn shall provide a
local supervisory alarm. The enclosure shall be suitably labeled "TO
ACTIVATE NOZZLES, LIFT COVER AND OPERATE STATION."
2.22
VALVE SUPERVISORY (TAMPER) SWITCH
Switch shall be designed to monitor the open condition of each water or
AFFF concentrate control valve to which it is mounted. It shall include a
cast aluminum housing, tamper proof cover, two sets of single pole, double
throw (SPDT) contacts and brackets and J-bolts needed for mounting.
Removal of the cover shall cause both switches to operate.
2.23
NOTIFICATION APPLIANCES
**************************************************************************
NOTE: The notification appliances are for providing
local notification of a system operation. They are
not intended to provide general building fire alarm
evacuation. Fire alarm evacuation systems are
covered in SECTION 13851A, FIRE DETECTION AND ALARM
SYSTEM ADDRESSABLE.
**************************************************************************
Notification appliances shall be suitable for connection to supervised
alarm indicating circuits. Appliance shall have a separate screw terminal
for each conductor.
2.24.1
Electronic Signaling Device
**************************************************************************
NOTE: It's important that AFFF system audible
signals be distinctively different from building
evacuation alarms, door alarms, etc. Because of
their field-selectable sounds and higher sound
output levels, electronic devices are recommended.
**************************************************************************
Device shall be surface-mounted type which can be mounted to a standard 100
mm 4 inch square back box. Electronic device shall operate on nominal 24
VDC, shall be polarized for line supervision and shall have screw terminals
for in-out wiring. Device shall be provided with three field-selectable
sounds (horn, warble, siren) and three sound output levels to 102 DBA in an
anechoic chamber at 3 m 10 feet.
2.24.2
Alarm Horn
Horn shall be surface mounted, with the matching mounting back box [surface
SECTION 13955A
Page 27
Previous Page
