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Wiring Specifications
Total Worst Case
Current Draw (amps)
0.700
0.800
0.900
1.000 (Max)
NOTE: The following formulas were used to generate the wire distance chart
Maximum Resistance (Ohms) =
Maximum Wire Length (Feet) =
(6000 feet maximum)
where: Rpu = Ohms per 1000 feet for various Wire Gauges (see table below)
Wiring Distance calculation example:
Suppose a system is configured with the following SBUS modules:
2 - RA-1000 Fire Annunciator
1 - RPS-1000 Intelligent Power Expander
1 - 5865 LED Fire Annunciator
1 - 5824 Parallel/Serial Interface
The total worst case current is calculated as follows:
Using this value, and referring to the Wiring Distance table, it can be found that the available options are:
370 feet maximum using 22 Gauge wire
938 feet maximum using 18 Gauge wire
1493 feet maximum using 16 Gauge wire
2362 feet maximum using 14 Gauge wire
RPS-1000 / RPS-1000B Manual - P/N 151153:N 08/09/2017
Table 2.7 Wire Distances Per Wire Gauge
Wiring Distance: SBUS Modules to Panel
22 Gauge
265 ft.
231 ft.
206 ft.
185 ft.
Table 2.8 Typical Wire Resistance Per 1000 ft.
Wire Gauge
22
18
16
14
RA-1000 Current Draw
RPS-1000 Current Draw
5865 Current Draw
5824 Current Draw
Total Worst Case Current Draw
18 Gauge
670 ft.
586 ft.
521 ft.
469 ft.
6.0 Volts
Total Worst Case Current Draw (amps)
Maximum Resistance (Ohms)
Rpu
Ohms per 1000 feet (Rpu)
16.2
6.4
4.02
2.54
= 2 x .100 amps
= .200 amps
= 1 x .010 amps
= .010 amps
= 1 x .200 amps
= .200 amps
= 1 x .040 amps
= .040 amps
= .450 amps
Before You Begin Installing
16 Gauge
14 Gauge
1066 ft.
1687 ft.
933 ft.
1476 ft.
829 ft.
1312 ft.
746 ft.
1181 ft.
* 500
18
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