AFP-300/AFP-400 Installation PN 50253:C1 05/22/97 B-1
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Each type of circuit within the Fire Alarm Control System requires use of a specific
wire type to ensure proper circuit operation. The wire gauge of a particular circuit
depends on the length of that circuit. Use Table B-1 to determine the specific wiring
requirements for each circuit.
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Compliance with the Federal Communications Commission (FCC) and Canadian
Department of Communication regulations on electrical energy radiation requires the
following: Use twisted-pair shielded wire for any wiring entering or exiting the
AFP-300/AFP-400 cabinet that is not enclosed in conduit.
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Circuit Type
Circuit
Function
Wire Requirements
Distance
(feet)
Typical Wire Type
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.
Untwisted, unshielded
wire, in conduit or
outside of conduit.
10,000
8,000
4,875
3,225
1,000
12 AWG Belden 9583 WPW 999
14 AWG Belden 9581 WPW 995
16 AWG Belden 9575 WPW 991
18 AWG Belden 9574 WPW 975
18-12 AWG
EIA-485
(power-
limited)
Connects to
LCD-80 or to
Annunciator
Control System
(ACS) modules
Twisted-shielded pair
with a characteristic
impedance of 120 ohms.
18 AWG minimum.
6,000 (max) Belden 9860 (16 AWG)
EIA-232
(power-
limited)
Connects to
PRN, P40
Remote Printers,
CRT, or PC.
Twisted-shielded pair.
18 AWG minimum.
50 (without
modem)
Belden 9860 (16 AWG)
MMX-1,
MMX-101
(power-
limited)
Initiating Device
Circuit (IDC)
12-18 AWG. Maximum
circuit resistance is
20 ohms.
To meet 20
ohms
12-18 AWG
CMX
(power-
limited)
Notification
Appliance
Circuit (NAC)
12-18 AWG. MPS-24A:
At alarm current level,
no more than a 1.2 V
drop at the end of the
circuit, or sized to
provide the minimum
rated operating voltage
of the appliances used.
To meet
1.2 V drop,
or sized to
provide the
minimum
rated
operating
voltage of the
appliances
used.
12-18 AWG
24 VDC
Power
Runs
(power-
limited)
To annunciators
and CMX
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
volt drop
12-18 AWG
NR45-24 Remote
Secondary
Power Source
12 AWG in conduit. 20 (max) 12 AWG
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