NFS2-640/E Installation Manual —
P/N 52741:P2 7/10/14
73
Wire Requirements
Electrical Specifications
Circuit Type
Circuit
Function
Wire Requirements
Distance
(feet/meters)
Typical Wire Type
SLC
(power limited)
Connects to
intelligent and
addressable
modules.
Twisted-unshielded pair, 12 to 18 AWG
(3.31 to 0.82 mm
2
). 50 ohms maximum per
length of Style 6 & 7 loops. 50 ohms per
branch maximum for Style 4 loop.
12,500 ft. (3,810 m)
9,500 ft. (2,895.6 m)
6,000 ft. (1,828.8 m)
3,700 ft. (1,127.76 m)
12 AWG (3.31 mm
2
)
14 AWG (2.08 mm
2
)
16 AWG (1.31 mm
2
)
18 AWG (0.82 mm
2
)
Twisted, shielded pair
NOTE:
• Shields must be isolated from ground.
• Shields should be broken at each
device.
5,000 ft. (1,524 m)
3,700 ft. (1,127.76 m)
12 to 16 AWG (3.31 to
01.31 mm
2
)
18 AWG (0.82 mm
2
)
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 ground) should not
exceed 0.5 mircofarads.
5,000 ft. (1,524 m)
3,700 ft. (1,127.76 m)
12 to 16 AWG (3.31 to
01.31 mm
2
)
18 AWG (0.82 mm
2
)
EIA-485
(power limited)
Connects to
FDU-80, ACS
modules, LCD-
80, or TM-4
Transmitter
Twisted-shielded pair with a characteristic
impedance of 120 ohms. 18 AWG (0.82
mm
2
) minimum.
6,000/1829
(max)
16 AWG (1.31 mm
2
)
EIA-232
(power limited)
Connects to
Printers, CRT,
or PC.
Twisted-shielded pair in conduit.
18 AWG (0.82 mm2) minimum.
20 feet (6.1 m)
(without modem)
16 AWG (1.31 mm
2
)
IDC
Initiating Device
Circuit
FMM-1,
FMM-101,
FDM-1XP10-M,
XP6-MA
(power limited)
12-18 AWG (3.31 to 0.82 mm
2
).
Maximum circuit resistance is 20 ohms.
12 to 18 AWG (3.31 to
0.82 mm
2
)
NAC
Notification
Appliance
Circuit
FCM-1*, XP6-C
(power limited)
12-18 AWG (3.31 to 0.82 mm
2
).
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 to 18 AWG (3.31 to
0.82 mm
2
)
Releasing
Module
FCM-1-REL
12-18 AWG (3.31 to 0.82 mm
2
).
5 ohms maximum per circuit for class A or
B, or sized to provide the minimum rated
operating voltage of the appliances used.
To meet 5 ohms
maximum circuit
resistance, or sized
to provide the
minimum rated
operating voltage of
the appliances used
12 to 18 AWG (3.31 to
0.82 mm
2
)
24 VDC Power
Runs
(power-limited)
To TM-4
Transmitter,
Annunciator and
FCM-1 modules
12-18 AWG (3.31 to 0.82 mm
2
).
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 to 18 AWG (3.31 to
0.82 mm
2
)
CHG-120
External battery
charger
12 AWG (3.31 mm
2
) in conduit
20/6.1 (max)
12 AWG (3.31 mm
2
)
* FCM-1 cannot be used for synchronized strobe/sounder applications.
Table B.1 Wire Requirements
NOTE:
Lightning arresters required on circuits extending between buildings; 999 meter length
maximum to meet UL 60950.
