2: Ann-Bus Annunciators/Modules; Ann-Bus Wiring - Fire-Lite MS-9200UDLS Manual

Installation
2.9.2 ANN-BUS Annunciators/Modules

ANN-BUS Wiring

This section contains information on calculating ANN-BUS wire distances and the types of wiring
configurations (Class B).

Calculating Wiring Distance for ANN-BUS Modules
The following instructions will guide the installer in determining the type of wire and the maximum
wiring distance that can be used with FACP ANN-BUS accessory modules.
To calculate the wire gauge that must be used to connect ANN-BUS modules to the FACP, it is nec-
essary to calculate the total worst case current draw for all modules on a single 4-conductor bus.
The total worst case current draw is calculated by adding the individual worst case currents for each
module. The individual worst case values are shown in the following table:
Model Number
ANN-80(C) LCD Annunciator/Indicator
ANN-S/PG Serial/Parallel Printer Interface Module
ANN-I/O LED Driver Module
ANN-(R)LED Annunciator Module
ANN-RLY Relay Module
ANN-LC Lite-Connect Module
After calculating the total worst case current draw, Table 2.1 specifies the maximum distance the
modules can be located from the FACP on a single wire run. The table ensures 6.0 volts of line
drop maximum. In general, the wire length is limited by resistance, but for heavier wire gauges,
capacitance is the limiting factor. These cases are marked in the chart with an asterisk (*). Maxi-
mum length can never be more than 6,000 feet (1,800 m), regardless of gauge used. The formula
used to generate this chart is shown in the note below.
Total Worst Case Current
Draw (amps)
0.100
0.200
0.300
0.400
0.500
42
1 When powering the ANN-BUS from one of the (nonresettable) DC power out-
puts at TB1, the total worst case current draw cannot exceed 1.0 amp. If
sharing this DC output with other devices, the worst case current drawn by
these devices must be combined with the ANN-BUS current draw, and the
total cannot exceed 1.0 amp. If the total current demand exceeds 1.0 amp,
refer to "Powering ANN-BUS Devices from an Auxiliary Power Supply" on
page 45.
Wiring Distance: ANN-BUS Modules to FACP
22 Gauge
1,852 ft.
926 ft.
617 ft.
463 ft.
370 ft.
Table 2.1 Wiring Distances
Worst Case Current Draw
0.040 amps
0.040 amps
0.200 amps
0.068 amps
0.075 amps
0.150 amps
18 Gauge 16 Gauge
4,688 ft. * 6,000 ft.
2,344 ft. 3,731 ft.
1,563 ft. 2,488 ft.
1,172 ft. 1,866 ft.
938 ft. 1,493 ft.
MS-9200UDLS Series Manual — P/N 52750:H 4/14/2014
Optional Module Installation
1
14 Gauge
*6,000 ft.
5,906 ft.
3,937 ft.
2,953 ft.
2,362 ft.