Honeywell INTELLIKNIGHT 5820XL - Manual (Page 47)

Control Panel Installation
151209 4-7
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.
Note: The following formulas were used to generate the wire distance chart:
Table 4-1: Wire Distances Per Wire Gauge Using Copper Wire
Wiring Distance: SBUS Modules to Panel
Total Worst Case
Current Draw (amps)
22 Gauge 18 Gauge 16 Gauge 14 Gauge
0.100 1852 ft. 4688 ft. * 6000 ft. * 6000 ft.
0.200 926 ft. 2344 ft. 3731 ft. 5906 ft.
0.300 617 ft. 1563 ft. 2488 ft. 3937 ft.
0.400 463 ft. 1172 ft. 1866 ft. 2953 ft.
0.500 370 ft. 938 ft. 1493 ft. 2362 ft.
0.600 309 ft. 781 ft. 1244 ft. 1969 ft.
0.700 265 ft. 670 ft. 1066 ft. 1687 ft.
0.800 231 ft. 586 ft. 933 ft. 1476 ft.
0.900 206 ft. 521 ft. 829 ft. 1312 ft.
1.000 (Max) 185 ft. 469 ft. 746 ft. 1181 ft.
Maximum Resistance (Ohms) =
6.0 Volts
Total Worst Case Current Draw (amps)
Maximum Wire Length (Feet) =
(6000 feet maximum)
Maximum Resistance (Ohms)
* 500
Rpu
where: Rpu = Ohms per 1000 feet for various wire gauges (see table below)
Table 4-2: Typical Wire Resistance Per 1000 ft. Using Copper Wire
Wire Gauge Ohms per 1000 feet (Rpu)
22 16.2
18 6.4
16 4.02
14 2.54