Honeywell 6820EVS Installation And Optimization Manual page 40

LS10144-001SK-E
5895XL Intelligent Power Supply
5496 Intelligent Power Supply
EVS-50W
EVS-125W
EVS-100W
EVS-100W with EVS-100WBU
EVS-VCM / EVS-VCM with EVS-SW24* **
EVS-LOC / EVS-LOC with EVS-SW24*
SK-NIC Network Interface Card
CELL-MOD/CELL-CAB-SK
SK-F485C Fiber Converter
Note: Refer to Table 3-2 is using SK Devices and Table 3-3 if using SD SLC devices for maximum number of
each type of device that can be used per system
* All devices must use the same SBUS and VBUS.
** When doing wire calculations, use .080 amps per device with .105 amps for the last device.
After calculating the total worst case current draw, Table 4-2 specifies the maximum distance the modules can be
located from the panel on a single wire run. The table ensures 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 note below.
Table 4-2: Wire Distances Per Wire Gauge Using Copper Wire
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)
Note: The following formulas were used to generate the wire distance chart:
Maximum Resistance (Ohms) =
Maximum Wire Length (Feet) =
(6000 feet maximum)
Table 4-1: SBUS Device Current Draw
Model Number
**
Wiring Distance: SBUS Modules to Panel
22 Gauge 18 Gauge
1852 ft. 4688 ft.
926 ft. 2344 ft.
617 ft. 1563 ft.
463 ft. 1172 ft.
370 ft. 938 ft.
309 ft. 781 ft.
265 ft. 670 ft.
231 ft. 586 ft.
206 ft. 521 ft.
185 ft. 469 ft.
Total Worst Case Current Draw (amps)
4-6
Worst Case Current Draw
.010 amps
.010 amps
.010 amps
.010 amps
.010 amps
.010 amps
.080 amps / .105 amps
.080 amps / .105 amps
.021 amps
.145 amps
.125 amps
16 Gauge
* 6000 ft.
3731 ft.
2488 ft.
1866 ft.
1493 ft.
1244 ft.
1066 ft.
933 ft.
829 ft.
746 ft.
6.0 Volts
Maximum Resistance (Ohms)
Rpu
Control Panel Installation
14 Gauge
* 6000 ft.
5906 ft.
3937 ft.
2953 ft.
2362 ft.
1969 ft.
1687 ft.
1476 ft.
1312 ft.
1181 ft.
* 500