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 7. Terminals and-other necessary facilities shall be provided in
the control panel to permit transmission of alarm signals to the
station fire alarm headquarters. All tiring and equipment necessary to
connect to the station fire alarm system shall be installed by the
contractor.
POWER SUPPLY:
1. The manual fire alarm system main power supply shall operate
from 120 volt or 220 volt A.C. obtained from the building service on
the line side of the main service panel unless otherwise directed.
Where an emergency power supply is available separate from the main
building supply, this emergency supply should be used as a secondary
supply for the alarm system. This connection shall he made in conduit
or cable in accordance with local and national codes. Separate
overcurrent protection shall be provided and marked "FIRE ALARM." A
circuit disconnecting means shall be so installed that it will be
accessible only by authorized personnel. A three wire feed shall be
provided with one wire used only for the trouble circuit.
2. The main A.C. power shall be converted to low voltage 12 or 24
direct current for system operation. Transformer, rectifier, fuses and
other power supply components shall be incorporated in the fire alarm
control panel or contained la a separate panel if approved for the
application.
3. Batteries shall be provided as a source of supply for operating
the audible and visual trouble signals and as an emergency source of
supply for operating the fire alarm system in the event of an
interruption in the main power. Batteries are normally required where
the interruption of the main power supply occurs frequently or under
special circumstances. A changeover relay, la the fire alarm control
panel, shall automatically transfer to the battery upon failure of the
main power. Restoration of main power shall automatically disconnect
the battery and reconnect the main power supply. There shall be no
drain on the emergency battery except during an interruption of main
power. Batteries shall be of the maintenance free type.
SIGNAL INITIATING DEVICES:
1. Manual fire alarm stations shall be non-coded, non-break glass,
pull type, equipped with a lock or other approved means so that they
may be test operated and designed so that after actual operation they
cannot be restored to normal except by turning the lock. Manual
stations shall be installed not less than four and one-half feet nor
more than six feet above floor level. Manual stations shall be located
as shown on the drawings. Note: Coded stations are required in
certain occupancies such as hospitals.
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