138
NFW-50X Manual —
P/N LS10129-001NF-E:C 7/25/2018
Appendix D: Wire Requirements
T-tapping of the SLC loop wiring is allowed for 2-wire (Class B) configurations. The total resistance of any branch cannot exceed 40
ohms. The total wire length of all branches cannot exceed 10,000 feet (3,000 m).
Connecting external system accessories to the NFW-50X main circuits must be carefully considered to ensure proper operation. It is
important to use the correct type of wire, gauge and run length for each NFW-50X circuit. Reference the chart below to specify wire
requirements and limitations for each NFW-50X circuit.
Note:
1.
If the SLC loop is to be run in conduit with Notification Appliance Circuits, the risk of encountering problems can be greatly
reduced by exclusively employing electronic sounders instead of more electronically noisy notification appliances such as
electromechanical bells or horns.
2.
The SLC can be programmed to operate in FlashScan mode (displayed as “LiteSpeed”, factory default setting) for a quicker device
response time. While shielded wire is not required in FlashScan mode, it is recommended that all SLC wiring be twisted-pair to
minimize the effects of electrical interference. Use the following table to determine the specific wiring requirements for the SLC
when unshielded wire is used:
Refer to Table D.1 on page 138 and Table D.2 on page 139 for wiring requirements.
CIRCUIT CONNECTIONS
WIRE REQUIREMENTS
Circuit Type
Circuit Function
Wire Type and
Limitations
Recommended Max.
Distance
Feet (meters)
Wire Gauge and Compatible Brands
SLC loop
(power-
limited)
Connects to
Addressable
Devices
CLIP MODE
Twisted, shielded pair
40 ohms maximum per
length of Class A loops. 40
ohms per branch maximum
for Class B loops
10,000 (3,000 m)
8,000 (2,400 m)
4,875 (1,450 m)
3,225 (980 m)
12 AWG (3.25 mm
2
): Genesis 4410,
Signal 98230, Belden 9583, WPW999
14 AWG (2.00 mm
2
):Genesis 4408 & 4608
Signal 98430, Belden 9581, WPW995
16 AWG (1.30 mm
2
): Genesis 4406 & 4606
Signal 98630, Belden 9575, WPW991
Direct Burial Cable Isotec NP713110VNQ-S
18 AWG (0.75 mm
2
): Genesis 4402 & 4602
Signal 98300, Belden 9574, WPW975
Direct Burial Cable Isotec NP714110VNQ-S
FLASHSCAN
MODE
Twisted, unshielded pair
40 ohms maximum per
length of Class A loops. 40
ohms per branch maximum
for Class B loops
10,000 (3,000 m)
8,000 (2,400 m)
4,875 (1,450 m)
3,225 (980 m)
12 AWG (3.25 mm
2
): Belden 5020UL &
6020UL, Genesis WG-4315 & WG-4515
14 AWG (2.00 mm
2
):Belden 5120UL &
6120UL, Genesis WG-4313 & WG-4513
16 AWG (1.30 mm
2
): Belden 5220UL &
6220UL, Genesis WG-4311 & WG-4511
18 AWG (0.75 mm
2
): Belden 5320UL &
6320UL, Genesis WG-4306 & WG-4506
Untwisted, unshielded pair
1
3,000 (900 m)
12-18 AWG (3.25 - 0.75 mm
2
) using listed wire
ANN-BUS
(EIA-485)
(power-
limited)
Connects to
annunciator
modules/
Twisted pair
Maximum loop wire
resistance is 2 ohms for
power and 40 ohms for
data
6,000 (1,800 m)
Refer to “ANN-BUS Wiring” on page 31 for
information on device wiring
monitor
module
(power-
limited)
Initiating Device
Circuit: Contact
Closure
Maximum loop wire
resistance is 1500 ohms
2,500 (760 m)
12-18 AWG (3.25 - 0.75 mm
2
)
monitor
module
(power-
limited)
Initiating Device
Circuit: Two-wire
Modules
No more than a 2.4 volt
drop allowed at end of
circuit. Maximum loop wire
resistance is 25 ohms
2,500 (760 m)
12-18 AWG (3.25 - 0.75 mm
2
)
control
module
(power-
limited)
Notification
Appliance Circuit
In alarm, no more than a
1.2 volt drop allowed at end
of circuit
Distance limitation set
by 1.2 volt maximum
line drop
12-18 AWG (3.25 - 0.75 mm
2
)
Remote Sync
Output
Provides strobe
and normal sync
for remote NAC
power supplies
Untwisted, unshielded pair
wire
Distance set by 295
ohm resistance
limitation
12-18 AWG (3.25 - 0.75 mm
2
)
Table D.1 FACP Wire Specifications
1 When using untwisted, unshielded wire, full conduit is recommended for optimum EMI/RFI protection.
