Honeywell SILENT KNIGHT 6700 Manual page 30

Control Panel Installation
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 chart below).
Total Worst Case
Current Draw (amps)
0.100
0.200
0.300
0.400
0.500
0.600
0.700
0.800
0.900
1.000 (Max)
The following formulas were used to generate the wire distance chart.
Wiring Distance Calculation Example
Suppose a system is configured with the following SBUS modules:
2 - 5860 Fire Annunciators
1 - 5496 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
30
Wiring Distance: SBUS Modules to Panel
22 Gauge
1852 ft.
926 ft.
617 ft.
463 ft.
370 ft.
309 ft.
265 ft.
231 ft.
206 ft.
185 ft.
Table 4.7 Wire Distances Per Wire Gauge
Maximum Resistance (Ohms) =
Maximum Wire Length (Feet) =
(6000 feet maximum)
where: Rpu = Ohms per 1000 feet for various Wire Gauges (see table below)
Wire Gauge
Table 4.8 Typical Wire Resistance Per 1,000 ft.
5860 Current Draw
5496 Current Draw
5865 Current Draw
5824 Current Draw
Total Worst Case Current Draw
18 Gauge
4688 ft.
2344 ft.
1563 ft.
1172 ft.
938 ft.
781 ft.
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)
22
18
16
14
= 2 x 0.100 amps
= 1 x 0.010 amps
= 1 x 0.200 amps
= 1 x 0.045 amps
6700 Manual — P/N LS10148-001SK-E:F 8/29/2022
16 Gauge
* 6000 ft.
3731 ft.
2488 ft.
1866 ft.
1493 ft.
1244 ft.
1066 ft.
933 ft.
829 ft.
746 ft.
* 500
16.2
6.4
4.02
2.54
= 0.200 amps
= 0.010 amps
= 0.200 amps
= 0.045 amps
= 0.455 amps
Wiring Specifications
14 Gauge
* 6000 ft.
5906 ft.
3937 ft.
2953 ft.
2362 ft.
1969 ft.
1687 ft.
1476 ft.
1312 ft.
1181 ft.