number plates on the exterior face of transmitters shall be provided.
Transmitters shall be designed to provide the same features as the fire
alarm boxes for electrically-supervised, coded [positive] [shunt]
noninterfering type and shall have the ability to transmit signals on
grounded or open circuits. Activation of box when a single open fault is
present on exterior fire alarm circuit shall have box to idle for one
complete round only, then immediately transmit four complete code rounds
via the box earth ground connection. Transmitter shall have a [shunt]
[local energy] type auxiliary tripping device. Code wheel shall be
metallic and box code shall be as directed. Wiring shall be extended to
the indicated telephone terminating location [for future connection by
other] [and connected to specific twisted pair cable identified by the COR
in the field]. [One new [_____]-pair [shielded] [non-shielded]
twisted-pair cable shall be extended to the Supervising Station and
connected to existing terminating equipment.]
PART 3
EXECUTION
3.1
INSTALLATION
All work shall be installed as shown, and in accordance with NFPA 70 and
NFPA 72, and in accordance with the manufacturer's diagrams and
recommendations, unless otherwise specified. Smoke detectors shall not be
installed until construction is essentially complete and the building has
been thoroughly cleaned.
3.1.1
Power Supply for the System
**************************************************************************
NOTE: It is the responsibility of the designer to
ensure that the source of power for the fire alarm
system is shown on the drawings.
**************************************************************************
A single dedicated circuit connection for supplying power from a branch
circuit to each building fire alarm system shall be provided. The power
shall be supplied as shown on the drawings. The power supply shall be
equipped with a locking mechanism and marked in red with the words "FIRE
ALARM CIRCUIT CONTROL".
3.1.2
Wiring
Conduit size for wiring shall be in accordance with NFPA 70. Wiring for
the fire alarm system shall not be installed in conduits, junction boxes,
or outlet boxes with conductors of lighting and power systems. Not more
than two conductors shall be installed under any device screw terminal.
The wires under the screw terminal shall be straight when placed under the
terminal then clamped in place under the screw terminal. The wires shall
be broken and not twisted around the terminal. Circuit conductors entering
or leaving any mounting box, outlet box enclosure, or cabinet shall be
connected to screw terminals with each terminal and conductor marked in
accordance with the wiring diagram. Connections and splices shall be made
using screw terminal blocks. The use of wire nut type connectors in the
system is prohibited. Wiring within any control equipment shall be readily
accessible without removing any component parts. The fire alarm equipment
manufacturer's representative shall be present for the connection of wiring
to the control panel.
SECTION 13851A
Page 29
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