Honeywell IFP-75 Installation & Operation Manual page 30

Control Panel Installation
Total Worst Case
Current Draw (amps)
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) =
(6,000 feet maximum)
where: Rpu = Ohms per 1,000 feet for various wire gauges (see table below)

Wiring Distance calculation example:
Suppose a system is configured with the following SBUS modules:
2 - Module RA-100 LCD Annunciator
1 - 5865 LED Fire Annunciator
1 - 5824 Parallel/Serial Interface
The total worst case current is calculated as follows:
RA-100 Current Draw
5865 Current Draw
5824 Current Draw
Total Worst Case Current Draw
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
231 ft.
206 ft.
185 ft.
Table 4.2 Wire Distances Per Wire Gauge Using Copper Wire (Continued)
Wire Gauge
22
18
16
14
Table 4.4 Typical Wire Resistance Per 1000 ft. Using Copper Wire
Table 4.5 Wiring Distance Calculation
IFP-75/IFP-75HV Installation/Operation Manual — P/N LS10147-001SK-E:D 06/25/2021
18 Gauge
586 ft.
521 ft.
469 ft.
6.0 Volts
Total Worst Case Current Draw (amps)
Maximum Resistance (Ohms)
Rpu
Table 4.3 Formula
Ohms per 1000 feet (Rpu)
16.2
6.4
4.02
2.54
= 2 x .100 amps
= 1 x .200 amps
= 1 x .040 amps
16 Gauge 14 Gauge
933 ft. 1476 ft.
829 ft. 1312 ft.
746 ft. 1181 ft.
* 500
= .200 amps
= .145 amps
= .040 amps
= .395 amps
SBUS Wiring