Honeywell NOTIFIER NFW-100X

34 NFW-100X Manual — P/N LS10131-001NF-E:C 7/25/2018
Installation Optional Module Installation
In general, the wire length is limited by resistance, but for heavier wire gauges, capacitance is the limiting factor. Maximum length can
never be more than 6,000 feet (1,800 m), regardless of gauge used. The following formulas were used to generate the wire distances:
Exception: When using the N-ANN-RLY module, the installer must ensure that the maximum 24VDC power line drop does not exceed
0.3 volts. This results in the following wiring limitations:
Wiring Distance Calculation Example:
Suppose a system is configured with the following ANN-BUS modules:
• 3 N-ANN-80 Remote Fire Annunciators
• 1 N-ANN-S/PG Serial/Parallel Printer Interface Module
The total worst case current is calculated as follows:

Wiring Configuration
Figure 2.17 illustrates the wiring between the FACP’s Primary ANN-BUS and ANN-BUS devices.
Maximum Resistance (Ohms)
=
2.0 Volts
Total Worst Case Current Draw (amps)
Maximum Wire Length (feet)
=
Maximum Resistance (Ohms)
x 500
(6,000 feet maximum) Rpu
where: Rpu = Ohms per 1,000 feet for various Wire Gauges (see table below)
Wire Gauge Ohms per 1,000 feet (Rpu)
22 16.2
18 6.4
16 4.02
14 2.54
Wire Gauge Maximum Wire Length
18 312 feet
16 497 feet
14 787 feet
12 1,250 feet
N-ANN-80 Current Draw = 3 X 0.040 amps = 0.120 amps
N-ANN-S/PG Current Draw = 1 X.0.040 amps = 0.040 amps
Total Worst Case Current Draw = 0.160 amps
TB1
4 3 2 1
+ -
Figure 2.17 Primary ANN-BUS wiring to ANN-BUS Device
ANN-BUS Device
NFW-100X
ANN-BUS and power wiring are
supervised and power-limited
24 VDC
nonresettable
Primary
ANN-BUS
e
s
2
0
0
t
o
a
n
n
8
0
.
w
m
f