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Before You Begin Installing
during that time. However, during normal operation, door holders draw current and must be included in the 6.0 A total current that can
be drawn from the panel.
***Use next size battery with capacity greater than required.
2.7 Wiring Specifications
2.7.1 Length Limitations
This section contains information on calculating SBUS wire distances and the types of wiring configurations (Class A and B).
2.7.2 Calculating Wiring distance for SBUS modules
The following instructions will guide you in determining the type of wire and the maximum wiring distance that can be used with SBUS
accessory modules.
To calculate the wire gauge that must be used to connect SBUS modules to the panel, it is necessary to calculate the total worst case cur-
rent 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 table below.
NOTE: Total worst case current draw on a single SBUS cannot exceed 1 amp. If a large number of accessory modules are required, and the
worst case current draw will exceed the 1 amp limit, then the current draw must be distributed using RPS-1000 Power Expanders. Each RPS-
1000 Power Expander provides an additional SBUS, with an additional 1 amp of SBUS current. Wiring distance calculations are done separately
for each RPS-1000, and separately for the panel itself
After calculating the total worst case current draw, Table 2.7 specifies the maximum distance the modules can be located from the panel
on a single wire run. The table insures 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 (*). Maximum length can never be more than 6,000 feet, 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
0.600
17
Model Number
Fire Annunciator
6815 SLC Loop Expander
5815XL SLC Loop Expander
5824 Serial/Parallel Printer Interface Module
5880 LED I/O Module
5865 LED Annunciator
Intelligent Power Supply
5496 NAC Expander
ECS-50W
ECS-125W
ECS-VCM / ECS-VCM with ECS-SW24*
ECS-NVCM Network Voice Control Module
ECS-EMG NVCM keypad
ECS-LOC
ECS-DUAL50W
ECS-DUAL50W WITH ECS-50WBU
SK-NIC Network Interface Card
CELL-MOD/CELL-CAB-SK
SK-F485C Fiber Converter
Table 2.7 Wire Distances Per Wire Gauge
Wiring Distance: SBUS Modules to Panel
22 Gauge
1852 ft.
926 ft.
617 ft.
463 ft.
370 ft.
309 ft.
Worst Case Current Draw
.120 amps
.078 amps
.150 amps
.040 amps
.250 amps
.200 amps
.010 amps
.010 amps
.010 amps
.010 amps
.115 amps /.185 amps
.059 amps
.06 amps
.210 amps /.325 amps
.010 amps
.010 amps
.021 amps
.145 amps
.125 amps
18 Gauge
16 Gauge
4688 ft.
* 6000 ft.
2344 ft.
3731 ft.
1563 ft.
2488 ft.
1172 ft.
1866 ft.
938 ft.
1493 ft.
781 ft.
1244 ft.
RPS-1000 / RPS-1000B Manual - P/N 151153:N 08/09/2017
Wiring Specifications
14 Gauge
* 6000 ft.
5906 ft.
3937 ft.
2953 ft.
2362 ft.
1969 ft.
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