Honeywell Farenhyt Series - 4.6.2 Connecting the RA-1000 to the Panel

36 IFP-300 Series Manual — P/N LS10145-001SK-E:C 4/6/2022
Control Panel Installation Wiring Specifications
After calculating the total worst case current draw, Table 4.3 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 chart below).
The following formulas were used to generate the wire distance chart
Model Number Worst Case Current Draw
RA-2000, RA-1000, RA-100 Fire Annunciators 0.120 amps
6815 SLC Loop Expander 0.078 amps
5815XL SLC Loop Expander 0.150 amps
5824 Serial/Parallel Printer Interface Module 0.040 amps
5880 LED I/O Module 0.250 amps
5865 LED Annunciator 0.200 amps
RPS-1000 Intelligent Power Supply 0.010 amps
5496 NAC Expander 0.010 amps
ECS-50W 0.010 amps
ECS-125W 0.010 amps
ECS-DUAL50W 0.010 amps
ECS-DUAL50W with ECS-50WBU 0.010 amps
ECS-VCM / ECS-VCM with ECS-SW24
1
0.115 amps per device/0.185 amps for last device
ECS-LOC with ECS-SW24
1
0.210 amps per device /0.325 amps for last device
ECS-NVCM Network Voice Control Module 0.059 amps
ECS-EMG keypad 0.06 amps
SK-NIC Network Interface Card 0.021 amps
CELL-MOD/CELL-CAB-SK 0.145 amps
SK-F485C Fiber Converter 0.125 amps
Table 4.2 SBUS Device Current Draw
1 All devices must use the same SBUS and VBUS.
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.
Table 4.3 Wire Distances Per Wire Gauge
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 4.4