Operation Wire Requirements
AFP-200 PN 15511:H2 10/14/2002 161
Appendix F Wire Requirements
Each type of circuit within the fire alarm control system must use a specific type of wire
to ensure proper operation. Also, the wire gauge of a particular circuit depends on the
length of that circuit. Use the table below to determine the specific wiring requirements
for each circuit.
Note: If running the SLC loop in conduit with Notification Appliance Circuits, you can
reduce the risk of encountering problems by exclusively using electronic sounders
(such as the MA/SS-24I) instead of more electronically noisy notification appliances
(such as electromechanical bells or horns).
Table 59 Wiring Requirements
Circuit Type Circuit Function Wire Requirements Distance Typical Wire Size
SLC Loop
(power-limited)
Connects to
intelligent and
addressable
modules
Twisted-shielded pair, 12 to 18
AWG. 40 ohms maximum per length
of Style 6 and 7 loops. 40 ohms per
branch maximum for Style 4 loops
• 10,000 ft
(3048 m)
• 8,000 ft.
(2438.4m)
• 4,875 ft.
(1485.9 m)
• 3,225 ft.
(982.98 m)
• 12 AWG
• 14 AWG
• 16 AWG
• 18 AWG
Untwisted, unshielded wire, in
conduit or outside of conduit
Note: Maximum total capacitance of
all SLC wiring (both between
conductors and from any conductor
to earth) should not exceed 0.5
mircofarads.
• 1,000 ft.
(304.8 m)
• 18-12 AWG
EIA-485
(power limited)
Connects to
LCD-80 or to
Annunciator
Control System
modules
Twisted-shielded pair with a
characteristic impedance of
120 ohms,18 AWG minimum
• 6,000 ft.
(1828.8 m)
(max)
• 16 AWG
EIA-232
(power-limited)
Connects to PRN
or P40 Remote
Printers and to a
DOS-based
personal
computer
Twisted-shielded pair 18 AWG
minimum
• 50 ft.
(15.24 m)
(without
modem)
• 16 AWG
Monitor Modules
(power-limited)
Initiating Device
Circuit (IDC)
12-18 AWG
Maximum loop wire resistance is
20 ohms
• To meet
20 ohms
• 12-18 AWG
Control Module
(power-limited)
Notification
Appliance Circuit
(NAC)
12-18 AWG
At alarm current level, no more than
a 1.2 V drop at the end of the circuit
• To meet
1.2 V drop
• 12-18 AWG
To annunciators
and control
modules
12-18 AWG Size wire so that no
more than 1.2 V drop across wire
run from supply source to end of
any branch
• To meet
1.2 V drop
• 12-18 AWG
NR45-24 Remote
secondary power
source
12 AWG in conduit • 20 ft.
(6.096 m)
(max)
• 12 AWG
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