NFS2-3030/E Installation Manual — P/N 52544:N1 07/18/2014
63
Wire Requirements
Electrical Specifications
Relay Output circuits are “Common” 30VDC, 2A (see Section 3.9 “Form-C Relays on the CPU”).
Power output circuits: TB6 on the CPU draws power from primary, secondary and external sources
to pass +24 VDC power to devices within the same enclosure as the CPU. If those devices have
outputs, the outputs must be power-limited. Power rating is determined by the power source(s). See
Section 3.10.1 “Overview”, and the AMPS-24 Manual for more details.
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
(3.25 to 0.75mm
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
)
or
Twisted-shielded pair.
NOTE:
• Shields must be isolated from ground.
• Shields should be broken at each
device.
5,000 ft (1524 m)
3,700 ft. (1,127.76 m)
12 to 16 AWG (3.31
mm
2
to 1.31 mm
2
)
18 AWG (0.82 mm
2
)
or
Untwisted, unshielded wire, in conduit or
outside of conduit.
NOTE:
Maximum total capacitance for
all
SLC wiring (both between conductors and
from any conductor to ground) should not
exceed 0.5 microfarads
5,000 ft (1524 m)
3,700 ft. (1,127.76 m)
12 to 16 AWG (3.31
mm
2
to 1.31 mm
2
)
18 AWG (0.82 mm
2
)
EIA-485 ACS
Connection
(power limited)
Connects to ACS
devices such as
annunciators and
UDACT/UDACT-2
Twisted-shielded pair with a characteristic
impedance of 120 ohms. 18 AWG
(0.75mm
2
) minimum.
6,000 ft (1829 m)
(max)
16 AWG (1.31mm
2
)
EIA-485 RDP
Connection
(power limited)
Connects to RDP
devices such as
LCD-160
Twisted-shielded pair with a characteristic
impedance of 120 ohms. 18 AWG
(0.75mm
2
) minimum.
4,000 ft (1219 m)
(max)
16 AWG (1.31 mm
2
)
EIA-232
(power limited)
Connects to Printers
or PC.
Twisted-shielded pair. 18 AWG (0.75mm
2
)
minimum.
50 ft (15.24 m)
without modem
16 AWG (1.31
mm
2
)
IDC
Initiating Device
Circuit
FMM-1, FMM-101
(power limited)
12-18 AWG
Maximum circuit resistance is 20 ohms.
12 to 18 AWG
(3.31 to 0.82 mm
2
)
NAC
Notification
Appliance
Circuit
FCM-1 (power
limited)
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 to 18 AWG
(3.31 to 0.82 mm
2
)
Releasing
Module
FCM-1-REL
12-18 AWG. 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. 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 in conduit
20 ft (6.1 m)
maximum
12 AWG
(3.31 mm
2
)
Table A.1 Wire Requirements
