STEP #2
GENERAL REQUIREMENTS FOR FIRE ALARM WIRING
Note: These wiring specifications are subject to local codes, and are not intended to circumvent any required
codes, jaws, or regulations.
e Only copper conductors may be used.
$
0 Al! wiring, except ground connection wiring, must be free from shorts and have a minimum resistance of one
megohm to ground.
,
o Metallic conduit, metallic raceway, plastic pipe, plastic raceway or approved fire alarm cable may be used.
Note: When using metallic conduit, and the continuity of the conduit is not maintained, a 12 AWG drain wire
(ground) must be connected between the break in the conduit installation.
o Only fire alarm system wiring may be run in the same conduit, raceway or multiconductor cable.
l
Each peripheral device (pull station, detector, horn, bell, etc.) must have its own enclosure (back box, outlet
box, etc.) per instructions provided with each device.
l
All wiring shall be terminated with U.L. listed devices (wire nuts, pressure connectors, etc.). Wiring terminated
with only electrical tape is not permitted. All splicing (free ends of conductors) shall be covered with an
insulation equivalent to that of the conductors.
REQUIREMENTS WHEN USING PLASTIC PIPE, PLASTIC RACEWAY, OR APPROVED FIRE ALARM CABLE
l
When a system wire is adjacent and parallel to other building wire runs, a minimum of 6 in. shall be maintained
between the different wire runs.
l
When a system wire is to cross over other building wires, the system wires shall cross at a 90” angle and have
a minimum of 6 in. separation.
l
All fire alarm cables entering an electrical box must be provided with a connector that provides strain relief and
protection for the cable.
l
All fire alarm cables shall be separated by at least 3 ft. from every heat-radiating recessed fixture (for example,
a high-hat fixture). Furthermore, cables shall not be installed in direct contact with lay-in fixture ballasts.
l
Where fire alarm cables are exposed to the weather, the cables shall be shielded or run in metallic raceway
with approved weatherproof or rain-tight fittings.
SYSTEM WIRING SPECIFICATIONS
hifiafing Device Wiring
(Zone Circuits) Use Field Wiring Diagrams #841-687 and 841-669.
Devices connected: Pull Stations, Heat Detectors, Smoke Detector, etc.
Wiring: - Up to 32 circuits with either two wires (for Style B operation) or four wires (for Style D operation) per
circuit. Each Style B, 2 wire circuit terminates with a 3.3K ohm E.O.L. resistor at the last device.
Zone wire resistance must not exceed 50 ohms, and its total wire length must not exceed 5,000 ft. Style:
B or 2,500 ft. Style D.
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