AFP-400 Installation
PN 50253:A2 03/12/96
B-1
Appendix B: Wire Requirements
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
the table below to determine the specific wiring requirements for each circuit.
Compliance with the Federal Communications Commission (FCC) and Canadian Department of Communi-
cation regulations on electrical energy radiation requires the following:
Use twisted pair shielded wire for
any wiring entering or exiting the AFP-400 cabinet that is not enclosed in conduit
.
If running an SLC Loop in conduit with Notification Appliance Circuits, you can reduce problems by
exclusively using electronic sounders (such as the MA/SS-24 Series) instead of more electronically
noisy notification appliances (such as electromechanical bells or horns).
AFP-400 Wiring Requirements
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.
10,000
8,000
4,875
3,225
12 AWG Belden 9583 WPW 999
14 AWG Belden 9581 WPW 995
16 AWG Belden 9575 WPW 991
18 AWG Belden 9574 WPW 975
Untwisted, unshielded wire, in
conduit or outside of conduit.
1,000
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 (max) Belden 9860 (16 AWG)
EIA-232
(power limited)
Connects to PRN
or P40 Remote
Printers and to PC
Computer
Twisted-shielded pair. 18 AWG
minimum.
50 (without
modem)
Belden 9860 (16 AWG)
MMX-1,
MMX-101
(power limited)
Initiating Device
Circuit
12-18 AWG. Maximum loop wire
resistance is 20 ohms
To meet 20
ohms
12-18AWG
CMX
(power limited)
Notification
Appliance Circuit
12-18 AWG. MPS-24A: At alarm
current level, no more than a 1.2
volts drop at the end of the
circuit.
To meet 1.2V
drop
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 volts 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
